TGSL need advice

[gost373]

Hello ,
I just finished my project,
on the card I have there is a 4V3 diode
in addition to the 7808 regulator and a transistor in addition ect ...
I soldered all the components! I put the circuit
powered on and it doesn't work!
do you have any suggestions?

I attach the diagram and the card model.

I got the wrong diagrams! here is the good!

[Nandor]

Oscillator not working?

[waltr]

Yes, is it oscillating?

Check on the TX Coil with your O'scope.

You do have the TX coil connected, right?

[gost373]

Hello ,
Nandor and Waltr,
I don't know if the oscillator is working?
the two coils are connected! no sound !
and I have no oscilloscope worthy of this no!
I only have a small DSO 138 (gadjet)
tell me how to do? Thank you .

Yes, something else! I was going to forget about the map that I have, there is
more components and a 4V3 Zener diode, why?
what is this diode for? Thank you .

[Nandor]

You have to see why its not working. The oscillator is the heart of this circuit, the 4,3V zenner is for amplitude stabilization.

[gost373]

Hello, Nandor,
I have deleted the parts in red on the map! ( see Attachment )
on the other hand for the moment, I left the sp1 wiring
when powering up I have a continuous sound !!
I will soon rewire sp1 (green color )

for the modifications I used the diagrams of the final tgsl rev 3

[Nandor]

There is no negative voltage thats the reason for the continous sound, check the oscillator.

[Op04]

This is what I looking, for the 4V3 zener is it save to replace with 1N4731A ? 1Watt rated?

[Nandor]

You can use almost any kind, it will work. The zenner is for amplitude limitation, so the sinewave wont be distorted.

[Op04]

You can use almost any kind, it will work. The zenner is for amplitude limitation, so the sinewave wont be distorted.

Thank You!!