Walkie Talkie Circuit Question

[Pvlic]

Hi! Im trying to make this walkie talkie circuit, but I am missing one component. Can someone help me how to make this one?!

 

[Willen]

I am missing one component.

Which component you are talking about?

 

[kimbear]

Which component you are talking about?

He has a black box around the output coil, maybe that's what hes missing, and it looks as tho its one that hes supposed to make himself

 

[ronsimpson]

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

 

[Pvlic]

Which component you are talking about?

The one with the box from the image is the component I dont have.

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

How about the 2 turn wire? Can you check the image if im doing it right?

 

[Willen]

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]

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]

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

 

[Pvlic]

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?

 

[JimB]

Can I just change the turns of the wire using a #22 AWG wire?

Yes.

JimB

 

[Pvlic]

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]

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.

 

[Dick Cappels]

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]

Yes, it can still work.
Yes, the "8R" on your schematic refers to the speaker being 8 ohms.

For the audio transformer, what type can I used? It's my first time to use audio transformer on my projects.

 

[Pvlic]

Yes.

JimB

Thank you for your reply. Can you check the image if im doing it right?

 

[Pvlic]

- 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.

 

[Willen]

About audio transformer:
Better to scrap from old AM radio receivers etc. It's small iron core transformer: https://scitoys.com/scitoys/scitoys/radio/hand_xformer.jpg

 

[Pvlic]

About audio transformer:
Better to scrap from old AM radio receivers etc. It's small iron core transformer: https://scitoys.com/scitoys/scitoys/radio/hand_xformer.jpg

Can I use this?

 

[JimB]

Can you check the image if im doing it right?

Yes, that looks OK.

JimB

 

[Willen]

Can I use this?

Measure the primary resistance and secondary resistance with your multimeter. Primary resistance should be very higher than secondary.