Cracks in sound speaker and MIC socket in ZX clone "Byte-48"

Цитата:

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Сообщение от Tronix

... and give sound signal before amplifer (from "minus" C14).

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Sorry, not understand. Please clearly and maybe draw scheme please.

http://habrastorage.org/files/b58/42...d2b8438952.png

OK, like this - but ground from where?
http://savepic.net/4781348m.png

Yes

OK, make connect like this but still cracks :-( (DD75 and C14 is desolder)
http://savepic.net/4742468m.png

Now desolder all: amp DD75, transistors VT5 & VT6, capacitor C14 and test computer only with 5V power supply. "Byte" working without 12V but still have cracks in external amp SONY :confused_std:
http://savepic.net/4751712m.png http://savepic.net/4744544m.png

Next i test like this:
1. Desolder R64 (SOUND) - still cracks (no BEEP sound)
2. Desolder R65 (TAPEOUT) - still cracks (no SAVE sound)
3. Desolder R46, R47, R48 (FX0, VI53) - I think something better but after some time some cracks back (VI53 not working)

4. Solder back R64 - I think there is no cracks
5. Solder back R65 - I think there is no cracks
6. Desolder sound cable C14 pin and GND
7. Solder back C14 capacitor, VT5, VT6 and DD75 amp
(not tested with desoldered R78 KDB_SND)

Now test "Byte" with AT PSU 5V + 12V (normal power supply) and no cracks (VI53 disconnect) :-) but I don't think that the VI53 is broken because Lambada last time worked.

Cracks again appears but sometimes immediatelly after power on, sometimes until few minutes - appears randomly :confused: Now, after placing everything back (DD75 amp, VT5, VT6, C14, all resistors) is sometimes something as in the video: http://www.youtube.com/watch?v=EJoyxCCKA0I