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Walkie Talkie Circuit Question

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ronsimpson

Well-Known Member
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Usually there is text with the schematic.
"Take a #2 pencil, wrap 9 turns of #22 wire.........."
 

Willen

Well-Known Member
It seems like a RF transformer. Your idea seems not bad. A site from where you picked the circuit says "Start with the primary 9 turns first, directly on this wind the secondary 2 turns."
 

dr pepper

Well-Known Member
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The 'T' on the schematic implies that the transformer has an adjustable core probably ferrite, you might need to salvage something from some dead circuitry and experiment.
 

audioguru

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The circuit seems to be very old and is extremely simple. It might have been a child's toy.
 

Pvlic

New Member
The 'T' on the schematic implies that the transformer has an adjustable core probably ferrite, you might need to salvage something from some dead circuitry and experiment.
I think I found one. The diameter is 5mm and 10mm tall. Can I just change the turns of the wire using a #22 AWG wire?
 

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JimB

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Pvlic

New Member
The circuit seems to be very old and is extremely simple. It might have been a child's toy.
Hi ! I have a few questions about the circuit.

- Is this circuit still works?
- Can I use an ordinary 8 ohms speaker for this? Which in the circuit acts as the microphone?
 

Willen

Well-Known Member
Hi ! I have a few questions about the circuit.

- Is this circuit still works?
- Can I use an ordinary 8 ohms speaker for this? Which in the circuit acts as the microphone?
- Old design does not mean it's damaged and not work in these days. :) It should work, don't worry. Some Chinese or other country still make such toy transceiver, under a couple of dollars.
- Yes, it needs an ordinary 8 ohms speaker. The same speaker works as microphone while you press the switch as Transmitting mode.

Since it's 27MHz RF circuit, solder each parts closely and make a couple of neat PCB.

Keep posting here how they work when you make it. I am also interested to such walkietalkies.
 
Last edited:

Dick Cappels

Active Member
Hi ! I have a few questions about the circuit.

- Is this circuit still works?
- Can I use an ordinary 8 ohms speaker for this? Which in the circuit acts as the microphone?
Yes, it can still work.
Yes, the "8R" on your schematic refers to the speaker being 8 ohms.
 

Pvlic

New Member
- Old design does not mean it's damaged and not work in these days. :) It should work, don't worry. Some Chinese or other country still make such toy transceiver, under a couple of dollars.
- Yes, it needs an ordinary 8 ohms speaker. The same speaker works as microphone while you press the switch as Transmitting mode.

Since it's 27MHz RF circuit, solder each parts closely and make a couple of neat PCB.

Keep posting here how they work when you make it. I am also interested to such walkietalkies.
Thank you. :):). I will update you when Im done with it. :D
 

JimB

Super Moderator
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Willen

Well-Known Member
Can I use this?
Measure the primary resistance and secondary resistance with your multimeter. Primary resistance should be very higher than secondary.
 
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