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So, I think I may have found the issue; the +ve voltage is shorting to ground. Im getting 600ohms of resistance between +ve and ground, while theres a good 1Mohm between the -ve and ground.

Pin 7 of U3 is identical to that picture. The 120K resistor in series with the input signal is trimming the top off

Thanks for the welcome!!

That picture is the signal at the collector of the 1st transistor in the ladder. All of the info for the build can be found here:

http://www.yusynth.net/Modular/index_ ...

Just double checked component polarities. All correct. Any ideas?

Hi everybody, i've just joined this forum after my first endeavours into the wonderful wold of DIY modular synthesisers. I have successfully built my first module, a Yusynth VCO, and I am now looking ...

Author	Message
Topic: Yusynth minimoog VCF trouble
alexmillman Replies: 10 Views: 9740	Posted: Thu Dec 15, 2016 6:13 am Subject: Yusynth minimoog VCF trouble Forum: DIY Hardware and Software » YuSynth
alexmillman Replies: 10 Views: 9740	So, I think I may have found the issue; the +ve voltage is shorting to ground. Im getting 600ohms of resistance between +ve and ground, while theres a good 1Mohm between the -ve and ground.
Topic: Yusynth minimoog VCF trouble
alexmillman Replies: 10 Views: 9740	Posted: Wed Dec 14, 2016 3:28 pm Subject: Yusynth minimoog VCF trouble Forum: DIY Hardware and Software » YuSynth
alexmillman Replies: 10 Views: 9740	Pin 7 of U3 is identical to that picture. The 120K resistor in series with the input signal is trimming the top off
Topic: Yusynth minimoog VCF trouble
alexmillman Replies: 10 Views: 9740	Posted: Wed Dec 14, 2016 3:03 pm Subject: Yusynth minimoog VCF trouble Forum: DIY Hardware and Software » YuSynth
alexmillman Replies: 10 Views: 9740	Thanks for the welcome!! That picture is the signal at the collector of the 1st transistor in the ladder. All of the info for the build can be found here: http://www.yusynth.net/Modular/index_ ...
Topic: Yusynth minimoog VCF trouble
alexmillman Replies: 10 Views: 9740	Posted: Wed Dec 14, 2016 1:36 pm Subject: Yusynth minimoog VCF trouble Forum: DIY Hardware and Software » YuSynth
alexmillman Replies: 10 Views: 9740	Just double checked component polarities. All correct. Any ideas?
Topic: Yusynth minimoog VCF trouble
alexmillman Replies: 10 Views: 9740	Posted: Tue Dec 13, 2016 2:26 pm Subject: Yusynth minimoog VCF trouble Forum: DIY Hardware and Software » YuSynth
alexmillman Replies: 10 Views: 9740	Hi everybody, i've just joined this forum after my first endeavours into the wonderful wold of DIY modular synthesisers. I have successfully built my first module, a Yusynth VCO, and I am now looking ...