VCF ISSUE : NO SOUND AND PULSE TRAIN ON VR5

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exagonal
 
Posts: 51
Joined: Sun Apr 29, 2012 11:15 am

VCF ISSUE : NO SOUND AND PULSE TRAIN ON VR5

Post by exagonal »

Hi to all !!
Making my fifth x0xb0x, I've got this problems..VCO seems to working well, but no sound passes through VCF. I can hear the classic pulse train of gate in modality random notes on VR5.
Testing voltages in this section, based on the voltage reference find in this forum, I found strange values on the pin 2 of Q21...up to 9volt instead of 5 about...
I just replace Q21 but nothing seem go better...
Any ideas??
Thank you very much!!

exagonal
 
Posts: 51
Joined: Sun Apr 29, 2012 11:15 am

Re: VCF ISSUE : NO SOUND AND PULSE TRAIN ON VR5

Post by exagonal »

Ok, i replace Q19 probably corrupted, and let relax the board a night...and now the sound goes out!! ;) Everything seems to be ok, the VCO, VCF and Envelope works well, but
the keys do not behave as they should.It appears that, apart from the first, all sounding the same note. Now I try to run a pitch and then upgrade.
Any suggestion is appreciated!

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