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

Michael E Caloroso mec.forumreader at gmail.com
Wed Jun 15 15:48:31 CEST 2022


Just a wild shot - did you check for oscillation on the line that supplies
bias for high frequency compensation?

MC

On Fri, Jun 10, 2022 at 8:24 PM Neil Harper via Synth-diy <
synth-diy at synth-diy.org> wrote:

>
>
> On 6/8/22 23:40, Ben Bradley via Synth-diy wrote:
> > Rereading the original, it seems reasonable to assume at least one
> > component is different in SMT from thru hole. I'd start replacing SMT
> > parts with thru hole and see what happens. I can't quite say why, but
> > I'd start with Q5 and Q6, and if no change then Q1-Q2. From there I'd
> > do the other active parts. After what you've already tried, this does
> > not have an easily identifiable solution.
>
> hey Ben
> i had a chance today to swap out Q5/Q6 (schmitt trigger) transistors
> with the 2N3904's I use in the TH version and unfortunately the results
> are the same.
>
>
>
> --
> /// Neil Harper
> /// Every Wave is New Until it Breaks
>
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