[sdiy] VCO that goes SHARP in highest octaves??

Jay Schwichtenberg jschwich53 at comcast.net
Wed May 11 00:44:36 CEST 2022


One issue when looking at HF oscillations is sometimes the scope probe 
adds enough capacitance or resistance to stop the oscillation. Also 
sometimes with HF oscillations op-amps may overheat. Might look to see 
if an op-amp is overheating by just touching them.

Jay S.

On 5/10/2022 3:16 PM, Neil Harper via Synth-diy wrote:
>
>
> On 5/10/22 08:43, Ian Fritz via Synth-diy wrote:
>> This is most often due to hi freq oscillations. Other causes, too, 
>> but I suggest starting there.
>>
>> Ian
>
> interesting ian, where would I see these high freq oscillations? the
> output of the oscillator looks clean without anything visible riding on
> the triangle with a 50MHz scope.
>
> -- 
> /// Neil Harper
> /// Every Wave is New Until it Breaks
>
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