modular at go2.pl
Mon Jan 22 20:31:07 CET 2018
Is whining somehow related to VCO frequency? Do you have any DC/DC converter? My first guess would be the largest ceramic cap you have there. Or electrolytic capacitor run over maximum ripple specs. Roman Dnia 22 stycznia 2018 17:24 Tim Ressel < timr at circuitabbey.com > napisał(a): Got a weird one... An oscillator I designed is whining. Well, some units do it. It is faint and you have to have your ear right up against the board to hear it. But an end user complained so we had to investigate. Other weirdness ensued but we got the customer taken care of. My question is: how to find where the whine is coming from? I tried using a microphone but could not pick anything up. This is an ASM-1 type VCO (saw core) so there is a pulse train present. That could explain the mic not picking it up. I tried putting my finger over various components on the board with no luck. I thought about using an accelerometer but it would have to be high sensitivity and low mass to work. I am at a loss. Any thoughts? -- --Tim Ressel Circuit Abbey timr at circuitabbey.com ______________________________ Synth-diy mailing list Synth-diy at synth-diy.org synth-diy.org synth-diy.org
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