Original subtitles

hello folks welcome to my new video

I haven't posted for a while

I've been busy at work and that

but I'll start doing some more videos now on YouTube

in the past

I showed you how to make transmitters like this one

did this one about 3 years ago I think this one

that's a 2 stage transmitter

it's got an osolite stage and audio company for stage

same with this one

and this was

a single stage audio input

these without microphones

so I mean to build these yourself

you'd have to source all the parts

and make your own circuit board

takes a bit of time and effort really

it's not worth doing when you can buy these from China

I think I buy

￡2 delivered wholesome just of 250 maybe

it was just over ￡2 pennies

how many concomplete bar v antenna

you know it's a single stage

single single transistor

it's only got

3 resistors I think it's got 7 capacitors

battery holder

switch microphone circuit board

supply your own antenna

I mean it's the

cheapest way to do something you know

if you're just getting to solder in it it's an ideal

little kit to build this

audio starter if you're getting into transmitters

should we build it and see if it works I'm sure it will

come on let's build it

just a quick note before this video starts

I noticed when I was compiling this video

the nails look a mess a woman's nails

well I do a lot of electronics

I do a lot of electronic work

I design them like these on eBay

so I'm always messing about electronics

and do a lot soldering

and you need long nails

it just makes working with electronics a lot easier

picking stuff up holding stuff down

so please don't leave nasty comments about my nails

I know they do look a mess

very good in the video but I just thought

we're doing that

that's what I sell on eBay

sold hundreds of them

these go well over a mile

these are on 434 megahertz

if you're interested just have a look on eBay

there's my eBay usernot URHF transmitter

now let's crack on with this video

okay get started

here's the kit right basket kit

just come with instructions

but I don't think they're in English

circuit board

no that's shorning

but I think we'll get more without them

let's sort the parts in order

there's the parts all sorted

not really many parts in this basic kit

it's only a basic transmitter

so there aren't going to be many parts

you've only got 3 resistors

the coil

microphone on switch and 1234567 capacitors

battery over

and

the circuit board which is clearly marked

for the price of this kit you can't go wrong can you

should we build it

okay we'll start with the resistors

as you can see I've made a blown up copy of the circuit

so what we'll start with is that

we'll start with R2

she there she's a 22 K resistor

you can either check a line if you're not sure

in the color codes with resistors

or you can use a multimeter

not sure if you can say that

what we're looking for is 22 K

we'll do it this way

so that one

there we go that's a 22 K I'll put that one in first

have a look on the circuit board

if you've never done this type of thing before

even these cheat boards from China

are quite well marked out

so you can see

I'm not sure if you can see that there

that's hard to a 22 k

what we do but place all the resistors in first

and what we'll do when we're soldering afterwards

so just place it in

just like that

that will solder a minute after

now what we've done our 2 to 22 K

so we'll do R one now which is 2.2

triple check height

stick that in

our last resistor is this R3 220 R

should you set the bottom out

what we'll do now just

chop the ends off and get it nice and neat

ready for soldering

as you can see that that's before he resisted it

all trimmed out not focused let's solder in

okay so do the resistors in

now I have to put a lot of flux diet

so it's always good to use as much flux as you can

get a lot better job

is it

those 3 resistors are one

that's the loud resistor for the mic

you can use different values

it's about the air microphone

more sensitive or less sensitive

so you can complain about it up

R2 that turns out the base of the only transition

this very basic FM transmitter

and R3 is like a load resistor

limit the chords

you can mess about with all the values on these

see what sort of results you get

very simple circuit

okay so next stage is capacitors

so we'll do C1 C2

that's both the 104

so all marks up clearly these cups

so you can't go wrong

when I thought

say what wonderful cat

say so

what we do we'll trim these as we go along

because we don't want too many big leads sticking out

it just looks a mess

and they get in the way of one another

so we'll trim it

and we'll solder them all in afterwards

okay so do the resistors in

now I have to put a lot of flux diet

so it's always good to use as much flux as you can

get a lot better job

is it

those 3 resistors are one

that's the loud resistor for the mic

you can use different values

it's about the air microphone

more sensitive or less sensitive

so you can complain about it up

R2 that turns out the base of the only transition

this very basic FM transmitter

and R3 is like a load resistor

limit the chords

you can mess about with all the values on these

see what sort of results you get

very simple circuit

okay so next stage is capacitors

so we'll do C1 C2

that's both the 104

so all marked up clearly these caps

so you can't go wrong

when I thought

say what wonderful cat

say so

what we do we'll trim these as we go along

because we don't want too many big leads sticking out

it just looks a mess

and they get in the way of one another

so we'll trim it

and we'll solder them all in afterwards

straight through

like I said

all the capacitors are clearly marked

so you can't get wrong

when you are placing these in and you've cut the leads

just if you got nails just for whatever

just bend them over like that

and get them flat so they don't drop out

that way they're staying

the stains are true cool

okay our next capacitors are C4 which is there

you see that

just next to the coil

so this is part of the tank circuit

this is what creates the transmitter

quite an amazing circuit for what it is

just like this now

a couple of components and they operate amazing speeds

so these are critical parts

it looks like

that's the tank circuit of the feedback 10p

should get them in next

have a look

online see how these tank circuits work

and learn how these oscillators actually work

very simple

but amazing speeds

should get them in next

C4 clearly marks on the board like I say 30p 30 PF

do the 10p next

that say 5

say that just drop that in

so 6 the other 30 PF

shot that in

such a cheap board clearly marked grass in it

the last one which is the output so the antenna

6 7

okay all the cups are in like I say

always use flux it makes older and a lot easier

and it gives you a lot neater results

so plenty of flux you can always wipe it off afterwards

that's pretty nice that's it

that's it that's all the caps in

not quite I can say this one in a minute

all in

okay next is the transistor

the only transistor on this circuit

it's clearly marked up the shape of the transistor

so you can't go wrong there

that's very easy

you can use all the transistors

or chip N3904 and ledgerverse

that's all

okay let's get the transistor in

okay next is the 4 tone coil

which is there in the diagram which goes there

what are those make sure you scrape off the enamel

if you don't it won't soldering

so make sure you give it a good scrape

and get rid of all the enamel

just be careful as you're doing it

you might just need to open out the turns of the coil

so if it's in the circuit

so just spread them out a little bit maybe

half a middle side between the coils each turn

there we go

go

just drop a hole in

there we go

lovely job light

cut the hole down to size and it looks nice

there are plenty

plenty of flux on the coil because it's quite thick

that's good enough

look I'm happy with that it's a big blob

looks a little bit tighter than that

I certainly went off of this

it's soldered in right but there's a bit of a gap there

I think one of those is a bit of a normal

that's gonna have to do

I don't like big blobs but I'll have to do

okay folks not a lot left now

battery older

next I've got this the microphone on an antenna

the antenna didn't come with a kick but been a while

so obviously

you can just go with the shape of the silk screen

a lot of you

just like that

that's all the next off lock stick

I'll clean that up afterwards

now the microphone

that's easy enough

just make sure you get this about way around

the ground is on the outside

so it's not going to quite fit in

but I'll fit in another angle but that'll do

that's the microphone which is air on the circuit

our transistor was there

of coil tag circuits just out

so we've got the switch next on the antenna

so we'll supply our own antenna

that's the only part you'll need

next is the on off switch

amazing with such a little cheap transmission

it even comes with that

I couldn't be bothered trimming them

very good

well it's all complete apart from the antenna

the only thing this kit doesn't come with isn't

had a while

but you know I've got one here to add

hundred and 20cm

but you could use a shorter one

obviously the longer the antenna the best of the range

but being a very basic single side transmitter

it isn't going to go far anyway

but I get a few hundred feet

and a couple hundred feet with internally size

so should be antenna and sugar

oh it goes there on the circuit here

on the circuit board TX

that's transmission out

in between say 4 and say 5 is the output say 7

let's get in it

okay so last bit of soldering on this transmitter

I've used flux

all done let's clean the boat up

whenever you do these boards or any board all right

you got a lot of flux on the board

looks a mess

so I've got some

piece of cleaner or flux cleaner got a spray

just remove all the flux and dry it off afterwards

so it will look a lot nicer on it

okay that's all done

not too bad

it's quite hard soldiering actually

and I'm filming it over the

that one doesn't look too good is it

look that one is it

it looks bad on camera but it looks good here

the coil that's good enough anyway we'll test this

pop

does it turn around

should get me a little frequency of cancerous

but a better look it works

okay folks

does it work

does this cheap cheap transmitter even work

that is I've got a fresh battery here

to pop that into it

okay there's no adjusters on this silver transmitter

you'll get a lot of variable capacitor

it hasn't got one

so the only way we're going to adjust this transmitter

adjust its frequency

is by compressing and expanding this coil

search for zoom in

you can see this is well worn

it's filter but I use it to my garage

I've got a couple of eggs

okay turn this frequency counter on

transmits up

oh it's alive

my God that's well out of the FM radio frequency

it's hundred and 14 megahertz

so what we'll do a compressis coil

and hopefully we get in the one of ice

one on 9

okay 106

part 5 all right let's get the radio

now I'll try and tune it into my beat up

battered old Swane Rider

I've got about 24 years

I've used this on loads of videos

so the notes on what was it

what are 6.5

as you can see the coil that is quite compressed

is there a call

I have to crush it right in to get it onto the

radio band so FM radio band

so you probably could do with a fortune call

oh there we go

that's feedback

so let's change in our car

lovely Jobler

so now the microphones working

I don't know if you can hear that

but that's me talking back to the radio

right we'll give it a little test

okay there's a transmitter here downstairs

right next to my TV

that's actually bad

does it more extensive rain once get 6

it's tomorrow morning and plenty of snow

so simple on transmitter

I mean that's got great audio for a single

for a single stage transmitter with one transistor

listen to that

that is a TV downstairs

I would go to a 400ft or more

depending on how are the antennaism

how long your antenna is

but a great little starter case

you can't go wrong

I do recommend it

and it works

look out yourself folks and see you next time

okay I've tested it and as you can see

as you seen in the last part of the video it works

we tested it at the same

surprisingly you get a decent audio output as well

considering

hasn't got an amplifier stage on the microphone

works better on a fork to be honest

but they're not very stable

there's no buffer stage or amplifier stage after this

after this tank circuit so

if you get near this antenna

or near a transmitter itself

the frequency is going to move slightly

so I saw a deal

if it's left in you know in blast and you don't move it

if you don't want to keep tuning your radio in

as you can see it's one of these tiny little frequency

frequency analyzers

not a cheap base but the work

I do a basic job like this

so I've got it on transmitters off at the moment

so we turn the transmitter on

oh there's a signal as you can see

but you'll see if I can

near the antenna

you see the frequency just drift slightly come away

plug it in and turn up

you set the frequency move slightly so not very stable

now you say that frequency move I said I'm one oh 6.7

if I get an antenna one 5.9 it does move quite a bit

but left in place with antenna not moved at all

it's down frequency until the battery

you know goes down

I just want to show you that

not the most stable but a very basic transmitter

bye