Great friend MV !!!
Thank you for your answer.
I am very happy that you are helping me to solve this problem.
> 90s2313 this device is used with a frequency of 20.
> it is much more datashita 90s2313, may not work.
I know the problem.
I bought n. 28 AT90s2313 from 8 different seller and I have found only 2 working chip at 20MHz.
> dd coil should be reduced to 0.
I don't know if I have undenstood well.
I have understood that I must place the two coil in a way to obtain the minimum signal at the rx input.
Is it correct ?
> tx and rx tune in resonance around 8000 Hz,
> you can select the frequency from 6000 to 9000 Hz,
> it depends on the capacitor in tx and rx,
> the accuracy of the settings +/ - 100 hertz,
> feeding frequency resonance for tx from 90s2313 on tx
> governing button frequency. Observe the sine on tx,
> key witnessing in the 4066 sdvinutye pulses,
> one of which is regulated by buttons phase.
Sorry, I don't understand the "sdvinutye" word.
I can change frequency using the pushbuttons.
However, first I must search the resonance frequency, but how can I see if the coils are in resonance ?
second I must see the sine of tx, but what I must see ?
third ???
Sorry if I haven't understood all your information.
Please, continue to help me.
Thank you,
Marco
P.S.
For all reader of this forum:
I will show the photos about all I have built If I found a way for finish this md.