allachikatillo
New Member
Hi!
I'm trying to clone vestax from original circuit for study project. Made the PCBs, but it doesn't work properly. The volume is low, pots doesn't much effect the sound (completely turned down pots still sending signal) and phones doesn't work as well.
I've checked the pcb and everything is connected right. But I find out the problem with transistor 2sc1627, it is to weak to supply U19 and phones pcb part.
Shorting the C and E out makes U19 working, but U7 distort the sound in phones.
The solving this problem doesn't mean the solving problem of the whole circuit. The question is why the original circuit doesn't work as it should be. Changing the transistor or supply part doesn't solve the problem with pots (i use this https://lib.chipdip.ru/995/DOC000995779.pdf, every pot is well grounded). I think something is causing all this problems, but can't find it.
I surmise thats its all about GND or supply in general.
What should I check or re-check, to find the problem?
I'm trying to clone vestax from original circuit for study project. Made the PCBs, but it doesn't work properly. The volume is low, pots doesn't much effect the sound (completely turned down pots still sending signal) and phones doesn't work as well.
I've checked the pcb and everything is connected right. But I find out the problem with transistor 2sc1627, it is to weak to supply U19 and phones pcb part.
Shorting the C and E out makes U19 working, but U7 distort the sound in phones.
The solving this problem doesn't mean the solving problem of the whole circuit. The question is why the original circuit doesn't work as it should be. Changing the transistor or supply part doesn't solve the problem with pots (i use this https://lib.chipdip.ru/995/DOC000995779.pdf, every pot is well grounded). I think something is causing all this problems, but can't find it.
I surmise thats its all about GND or supply in general.
What should I check or re-check, to find the problem?
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