VCO troubleshooting

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jean_schön
Learning to Wiggle
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VCO troubleshooting

Post by jean_schön » Mon Dec 03, 2018 3:04 pm

Everything is working great except that the sawtooth output is only about 2 volts peak to peak, while the rest of the ouputs are 10 volts peak to peak.
And, i assume related to this, is that there is no pulse output when PWM type is set to edge, no signal. I have checked all the wiring which is correct. any ideas?

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Synthbuilder
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Post by Synthbuilder » Tue Dec 04, 2018 4:20 am

Probably the gain setting resistors around U5b (pins 5, 6, 7). So check the values of R61 and R63. Possibly also R59, R62, R64 and R65.

Tony

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jean_schön
Learning to Wiggle
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Joined: Sat Oct 01, 2016 5:12 am

Post by jean_schön » Tue Dec 04, 2018 1:57 pm

Synthbuilder wrote:Probably the gain setting resistors around U5b (pins 5, 6, 7). So check the values of R61 and R63. Possibly also R59, R62, R64 and R65.

Tony
Thanks, R62 was 10K instead of 1K. that solved it!

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