What is Q9 and associated circuitry (R41,C34) ? It is not on any of the Etherwave schematics I have found. It can be seen directly above CN1 connector.
Thank you.
Etherwave PCB 11-211J 2009-12-04 what is Q9 and associated circuitry ?
Posted: 4/2/2025 11:00:15 PM
Hello Doug,
After a lot of eye strain it reveals itself as the Pitch Tuning section on the schematic working with Q5 near Q3 & Q4 the 2N3904 NPN Transistors as seen on many schematics . . . BUT Q9 2N3906 is a PNP configuration. I miss my theremin design days.
- Father Time has his ways, Life is Good -
Your neighbor in Old Temecula CA
Christophe
Edit: Yes I see it now as they seem to complement each another.
Posted: 4/2/2025 11:22:57 PM
Thanks for the input. This is what I am looking at. Q5 seems to be at the top, Q3 and Q4 to the left and Q9, whatever it is, is just to the right. I don't see Q9 on any schematic I have.
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