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hello folks welcome to my new video
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I haven't posted for a while
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I've been busy at work and that
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but I'll start doing some more videos now on YouTube
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in the past
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I showed you how to make transmitters like this one
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did this one about 3 years ago I think this one
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that's a 2 stage transmitter
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it's got an osolite stage and audio company for stage
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same with this one
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and this was
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a single stage audio input
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these without microphones
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so I mean to build these yourself
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you'd have to source all the parts
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and make your own circuit board
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takes a bit of time and effort really
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it's not worth doing when you can buy these from China
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I think I buy
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£2 delivered wholesome just of 250 maybe
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it was just over £2 pennies
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how many concomplete bar v antenna
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you know it's a single stage
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single single transistor
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it's only got
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3 resistors I think it's got 7 capacitors
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battery holder
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switch microphone circuit board
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supply your own antenna
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I mean it's the
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cheapest way to do something you know
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if you're just getting to solder in it it's an ideal
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little kit to build this
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audio starter if you're getting into transmitters
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should we build it and see if it works I'm sure it will
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come on let's build it
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just a quick note before this video starts
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I noticed when I was compiling this video
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the nails look a mess a woman's nails
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well I do a lot of electronics
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I do a lot of electronic work
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I design them like these on eBay
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so I'm always messing about electronics
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and do a lot soldering
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and you need long nails
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it just makes working with electronics a lot easier
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picking stuff up holding stuff down
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so please don't leave nasty comments about my nails
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I know they do look a mess
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very good in the video but I just thought
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we're doing that
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that's what I sell on eBay
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sold hundreds of them
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these go well over a mile
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these are on 434 megahertz
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if you're interested just have a look on eBay
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there's my eBay usernot URHF transmitter
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now let's crack on with this video
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okay get started
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here's the kit right basket kit
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just come with instructions
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but I don't think they're in English
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circuit board
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no that's shorning
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but I think we'll get more without them
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let's sort the parts in order
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there's the parts all sorted
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not really many parts in this basic kit
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it's only a basic transmitter
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so there aren't going to be many parts
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you've only got 3 resistors
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the coil
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microphone on switch and 1234567 capacitors
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battery over
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and
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the circuit board which is clearly marked
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for the price of this kit you can't go wrong can you
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should we build it
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okay we'll start with the resistors
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as you can see I've made a blown up copy of the circuit
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so what we'll start with is that
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we'll start with R2
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she there she's a 22 K resistor
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you can either check a line if you're not sure
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in the color codes with resistors
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or you can use a multimeter
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not sure if you can say that
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what we're looking for is 22 K
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we'll do it this way
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so that one
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there we go that's a 22 K I'll put that one in first
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have a look on the circuit board
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if you've never done this type of thing before
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even these cheat boards from China
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are quite well marked out
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so you can see
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I'm not sure if you can see that there
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that's hard to a 22 k
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what we do but place all the resistors in first
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and what we'll do when we're soldering afterwards
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so just place it in
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just like that
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that will solder a minute after
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now what we've done our 2 to 22 K
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so we'll do R one now which is 2.2
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triple check height
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stick that in
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our last resistor is this R3 220 R
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should you set the bottom out
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what we'll do now just
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chop the ends off and get it nice and neat
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ready for soldering
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as you can see that that's before he resisted it
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all trimmed out not focused let's solder in
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okay so do the resistors in
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now I have to put a lot of flux diet
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so it's always good to use as much flux as you can
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get a lot better job
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is it
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those 3 resistors are one
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that's the loud resistor for the mic
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you can use different values
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it's about the air microphone
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more sensitive or less sensitive
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so you can complain about it up
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R2 that turns out the base of the only transition
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this very basic FM transmitter
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and R3 is like a load resistor
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limit the chords
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you can mess about with all the values on these
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see what sort of results you get
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very simple circuit
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okay so next stage is capacitors
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so we'll do C1 C2
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that's both the 104
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so all marks up clearly these cups
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so you can't go wrong
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when I thought
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say what wonderful cat
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say so
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what we do we'll trim these as we go along
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because we don't want too many big leads sticking out
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it just looks a mess
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and they get in the way of one another
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so we'll trim it
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and we'll solder them all in afterwards
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okay so do the resistors in
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now I have to put a lot of flux diet
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so it's always good to use as much flux as you can
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get a lot better job
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is it
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those 3 resistors are one
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that's the loud resistor for the mic
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you can use different values
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it's about the air microphone
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more sensitive or less sensitive
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so you can complain about it up
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R2 that turns out the base of the only transition
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this very basic FM transmitter
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and R3 is like a load resistor
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limit the chords
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you can mess about with all the values on these
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see what sort of results you get
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very simple circuit
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okay so next stage is capacitors
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so we'll do C1 C2
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that's both the 104
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so all marked up clearly these caps
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so you can't go wrong
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when I thought
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say what wonderful cat
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say so
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what we do we'll trim these as we go along
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because we don't want too many big leads sticking out
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it just looks a mess
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and they get in the way of one another
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so we'll trim it
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and we'll solder them all in afterwards
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straight through
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like I said
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all the capacitors are clearly marked
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so you can't get wrong
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when you are placing these in and you've cut the leads
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just if you got nails just for whatever
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just bend them over like that
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and get them flat so they don't drop out
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that way they're staying
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the stains are true cool
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okay our next capacitors are C4 which is there
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you see that
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just next to the coil
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so this is part of the tank circuit
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this is what creates the transmitter
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quite an amazing circuit for what it is
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just like this now
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a couple of components and they operate amazing speeds
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so these are critical parts
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it looks like
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that's the tank circuit of the feedback 10p
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should get them in next
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have a look
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online see how these tank circuits work
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and learn how these oscillators actually work
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very simple
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but amazing speeds
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should get them in next
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C4 clearly marks on the board like I say 30p 30 PF
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do the 10p next
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that say 5
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say that just drop that in
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so 6 the other 30 PF
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shot that in
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such a cheap board clearly marked grass in it
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the last one which is the output so the antenna
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6 7
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okay all the cups are in like I say
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always use flux it makes older and a lot easier
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and it gives you a lot neater results
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so plenty of flux you can always wipe it off afterwards
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that's pretty nice that's it
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that's it that's all the caps in
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not quite I can say this one in a minute
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all in
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okay next is the transistor
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the only transistor on this circuit
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it's clearly marked up the shape of the transistor
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so you can't go wrong there
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that's very easy
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you can use all the transistors
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or chip N3904 and ledgerverse
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that's all
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okay let's get the transistor in
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okay next is the 4 tone coil
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which is there in the diagram which goes there
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what are those make sure you scrape off the enamel
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if you don't it won't soldering
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so make sure you give it a good scrape
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and get rid of all the enamel
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just be careful as you're doing it
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you might just need to open out the turns of the coil
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so if it's in the circuit
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so just spread them out a little bit maybe
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half a middle side between the coils each turn
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there we go
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go
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just drop a hole in
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there we go
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lovely job light
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cut the hole down to size and it looks nice
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there are plenty
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plenty of flux on the coil because it's quite thick
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that's good enough
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look I'm happy with that it's a big blob
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looks a little bit tighter than that
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I certainly went off of this
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it's soldered in right but there's a bit of a gap there
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I think one of those is a bit of a normal
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that's gonna have to do
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I don't like big blobs but I'll have to do
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okay folks not a lot left now
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battery older
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next I've got this the microphone on an antenna
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the antenna didn't come with a kick but been a while
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so obviously
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you can just go with the shape of the silk screen
266
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a lot of you
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just like that
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that's all the next off lock stick
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I'll clean that up afterwards
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now the microphone
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that's easy enough
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just make sure you get this about way around
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the ground is on the outside
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so it's not going to quite fit in
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but I'll fit in another angle but that'll do
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that's the microphone which is air on the circuit
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our transistor was there
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of coil tag circuits just out
279
00:16:26,100 --> 00:16:33,400
so we've got the switch next on the antenna
280
00:16:33,766 --> 00:16:35,599
so we'll supply our own antenna
281
00:16:35,600 --> 00:16:37,366
that's the only part you'll need
282
00:16:41,133 --> 00:16:43,033
next is the on off switch
283
00:16:46,800 --> 00:16:48,766
amazing with such a little cheap transmission
284
00:16:48,766 --> 00:16:50,199
it even comes with that
285
00:16:53,333 --> 00:16:55,499
I couldn't be bothered trimming them
286
00:17:03,700 --> 00:17:04,566
very good
287
00:17:08,566 --> 00:17:11,666
well it's all complete apart from the antenna
288
00:17:11,766 --> 00:17:15,199
the only thing this kit doesn't come with isn't
289
00:17:15,200 --> 00:17:15,600
had a while
290
00:17:15,600 --> 00:17:17,466
but you know I've got one here to add
291
00:17:17,466 --> 00:17:18,699
hundred and 20cm
292
00:17:18,700 --> 00:17:20,400
but you could use a shorter one
293
00:17:20,600 --> 00:17:22,933
obviously the longer the antenna the best of the range
294
00:17:22,933 --> 00:17:25,499
but being a very basic single side transmitter
295
00:17:25,500 --> 00:17:26,800
it isn't going to go far anyway
296
00:17:26,800 --> 00:17:28,800
but I get a few hundred feet
297
00:17:28,800 --> 00:17:31,300
and a couple hundred feet with internally size
298
00:17:31,300 --> 00:17:34,433
so should be antenna and sugar
299
00:17:35,166 --> 00:17:38,999
oh it goes there on the circuit here
300
00:17:39,000 --> 00:17:40,966
on the circuit board TX
301
00:17:41,566 --> 00:17:42,833
that's transmission out
302
00:17:44,800 --> 00:17:49,900
in between say 4 and say 5 is the output say 7
303
00:17:51,466 --> 00:17:52,699
let's get in it
304
00:17:53,066 --> 00:17:57,066
okay so last bit of soldering on this transmitter
305
00:17:57,066 --> 00:17:58,166
I've used flux
306
00:18:01,933 --> 00:18:03,966
all done let's clean the boat up
307
00:18:06,733 --> 00:18:09,299
whenever you do these boards or any board all right
308
00:18:09,300 --> 00:18:10,766
you got a lot of flux on the board
309
00:18:10,766 --> 00:18:11,666
looks a mess
310
00:18:12,366 --> 00:18:13,633
so I've got some
311
00:18:15,566 --> 00:18:19,966
piece of cleaner or flux cleaner got a spray
312
00:18:24,133 --> 00:18:26,499
just remove all the flux and dry it off afterwards
313
00:18:27,900 --> 00:18:30,033
so it will look a lot nicer on it
314
00:18:33,200 --> 00:18:34,900
okay that's all done
315
00:18:36,500 --> 00:18:37,600
not too bad
316
00:18:37,600 --> 00:18:39,300
it's quite hard soldiering actually
317
00:18:39,300 --> 00:18:41,166
and I'm filming it over the
318
00:18:44,066 --> 00:18:45,966
that one doesn't look too good is it
319
00:18:46,200 --> 00:18:47,633
look that one is it
320
00:18:47,933 --> 00:18:50,366
it looks bad on camera but it looks good here
321
00:18:52,333 --> 00:18:56,833
the coil that's good enough anyway we'll test this
322
00:19:00,533 --> 00:19:01,333
pop
323
00:19:02,900 --> 00:19:03,700
does it turn around
324
00:19:09,866 --> 00:19:12,233
should get me a little frequency of cancerous
325
00:19:13,133 --> 00:19:14,999
but a better look it works
326
00:19:19,166 --> 00:19:20,433
okay folks
327
00:19:22,066 --> 00:19:22,999
does it work
328
00:19:23,000 --> 00:19:27,966
does this cheap cheap transmitter even work
329
00:19:29,666 --> 00:19:31,699
that is I've got a fresh battery here
330
00:19:31,900 --> 00:19:33,400
to pop that into it
331
00:19:40,400 --> 00:19:43,800
okay there's no adjusters on this silver transmitter
332
00:19:43,800 --> 00:19:46,400
you'll get a lot of variable capacitor
333
00:19:46,400 --> 00:19:47,266
it hasn't got one
334
00:19:47,266 --> 00:19:50,433
so the only way we're going to adjust this transmitter
335
00:19:50,566 --> 00:19:51,599
adjust its frequency
336
00:19:51,600 --> 00:19:55,500
is by compressing and expanding this coil
337
00:19:57,466 --> 00:19:58,499
search for zoom in
338
00:20:04,300 --> 00:20:05,800
you can see this is well worn
339
00:20:05,800 --> 00:20:08,400
it's filter but I use it to my garage
340
00:20:08,400 --> 00:20:09,800
I've got a couple of eggs
341
00:20:10,533 --> 00:20:13,166
okay turn this frequency counter on
342
00:20:15,766 --> 00:20:16,899
transmits up
343
00:20:17,533 --> 00:20:18,699
oh it's alive
344
00:20:19,533 --> 00:20:23,299
my God that's well out of the FM radio frequency
345
00:20:23,366 --> 00:20:24,866
it's hundred and 14 megahertz
346
00:20:24,866 --> 00:20:27,533
so what we'll do a compressis coil
347
00:20:27,533 --> 00:20:29,899
and hopefully we get in the one of ice
348
00:20:31,333 --> 00:20:32,299
one on 9
349
00:20:36,933 --> 00:20:38,566
okay 106
350
00:20:40,166 --> 00:20:44,999
part 5 all right let's get the radio
351
00:20:47,066 --> 00:20:49,066
now I'll try and tune it into my beat up
352
00:20:49,066 --> 00:20:50,533
battered old Swane Rider
353
00:20:50,533 --> 00:20:51,866
I've got about 24 years
354
00:20:51,866 --> 00:20:54,633
I've used this on loads of videos
355
00:20:55,400 --> 00:20:57,833
so the notes on what was it
356
00:21:00,066 --> 00:21:01,499
what are 6.5
357
00:21:02,466 --> 00:21:04,866
as you can see the coil that is quite compressed
358
00:21:06,000 --> 00:21:06,966
is there a call
359
00:21:06,966 --> 00:21:09,633
I have to crush it right in to get it onto the
360
00:21:10,600 --> 00:21:12,366
radio band so FM radio band
361
00:21:12,366 --> 00:21:15,066
so you probably could do with a fortune call
362
00:21:22,466 --> 00:21:23,399
oh there we go
363
00:21:23,400 --> 00:21:24,166
that's feedback
364
00:21:24,166 --> 00:21:26,699
so let's change in our car
365
00:21:27,300 --> 00:21:28,400
lovely Jobler
366
00:21:28,900 --> 00:21:30,400
so now the microphones working
367
00:21:30,400 --> 00:21:31,466
I don't know if you can hear that
368
00:21:31,466 --> 00:21:33,466
but that's me talking back to the radio
369
00:21:33,933 --> 00:21:35,766
right we'll give it a little test
370
00:21:40,200 --> 00:21:42,666
okay there's a transmitter here downstairs
371
00:21:43,366 --> 00:21:44,866
right next to my TV
372
00:22:19,366 --> 00:22:20,166
that's actually bad
373
00:22:20,166 --> 00:22:22,566
does it more extensive rain once get 6
374
00:22:22,566 --> 00:22:24,466
it's tomorrow morning and plenty of snow
375
00:22:24,466 --> 00:22:25,733
so simple on transmitter
376
00:22:25,733 --> 00:22:29,566
I mean that's got great audio for a single
377
00:22:30,266 --> 00:22:32,866
for a single stage transmitter with one transistor
378
00:22:34,366 --> 00:22:35,166
listen to that
379
00:22:35,166 --> 00:22:36,666
that is a TV downstairs
380
00:22:37,866 --> 00:22:40,233
I would go to a 400ft or more
381
00:22:41,100 --> 00:22:42,900
depending on how are the antennaism
382
00:22:43,766 --> 00:22:44,799
how long your antenna is
383
00:22:44,800 --> 00:22:46,600
but a great little starter case
384
00:22:46,966 --> 00:22:48,066
you can't go wrong
385
00:22:52,566 --> 00:22:53,799
I do recommend it
386
00:22:58,533 --> 00:23:13,199
and it works
387
00:23:21,466 --> 00:23:23,599
look out yourself folks and see you next time
388
00:23:28,066 --> 00:23:30,066
okay I've tested it and as you can see
389
00:23:30,066 --> 00:23:33,133
as you seen in the last part of the video it works
390
00:23:33,133 --> 00:23:34,299
we tested it at the same
391
00:23:34,933 --> 00:23:37,666
surprisingly you get a decent audio output as well
392
00:23:38,300 --> 00:23:38,800
considering
393
00:23:38,800 --> 00:23:41,100
hasn't got an amplifier stage on the microphone
394
00:23:41,333 --> 00:23:43,033
works better on a fork to be honest
395
00:23:43,333 --> 00:23:44,699
but they're not very stable
396
00:23:45,066 --> 00:23:48,633
there's no buffer stage or amplifier stage after this
397
00:23:48,933 --> 00:23:51,066
after this tank circuit so
398
00:23:52,333 --> 00:23:53,666
if you get near this antenna
399
00:23:53,733 --> 00:23:55,299
or near a transmitter itself
400
00:23:55,300 --> 00:23:57,266
the frequency is going to move slightly
401
00:23:57,266 --> 00:23:57,933
so I saw a deal
402
00:23:57,933 --> 00:24:00,633
if it's left in you know in blast and you don't move it
403
00:24:00,866 --> 00:24:02,899
if you don't want to keep tuning your radio in
404
00:24:03,100 --> 00:24:05,366
as you can see it's one of these tiny little frequency
405
00:24:08,066 --> 00:24:09,499
frequency analyzers
406
00:24:10,666 --> 00:24:12,199
not a cheap base but the work
407
00:24:12,200 --> 00:24:13,900
I do a basic job like this
408
00:24:13,900 --> 00:24:16,966
so I've got it on transmitters off at the moment
409
00:24:16,966 --> 00:24:18,766
so we turn the transmitter on
410
00:24:21,500 --> 00:24:23,633
oh there's a signal as you can see
411
00:24:25,000 --> 00:24:26,066
but you'll see if I can
412
00:24:26,066 --> 00:24:26,999
near the antenna
413
00:24:28,866 --> 00:24:32,966
you see the frequency just drift slightly come away
414
00:24:37,000 --> 00:24:38,200
plug it in and turn up
415
00:24:38,200 --> 00:24:41,833
you set the frequency move slightly so not very stable
416
00:24:43,866 --> 00:24:48,699
now you say that frequency move I said I'm one oh 6.7
417
00:24:48,900 --> 00:24:54,433
if I get an antenna one 5.9 it does move quite a bit
418
00:24:56,600 --> 00:25:00,000
but left in place with antenna not moved at all
419
00:25:02,566 --> 00:25:04,899
it's down frequency until the battery
420
00:25:05,166 --> 00:25:07,199
you know goes down
421
00:25:08,866 --> 00:25:10,366
I just want to show you that
422
00:25:10,766 --> 00:25:14,799
not the most stable but a very basic transmitter
423
00:25:17,200 --> 00:25:18,066
bye
28054
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