Nostradoomus
Well-known member
Silly and stupid are two different things!
What value pots are you supposed to use, I’ve got my board ready and my enclosure drilled but there’s still no build doc up yet
What value pots are you supposed to use, I’ve got my board ready and my enclosure drilled but there’s still no build doc up yet
You mean trim to 4.5V between q3 collector and ground?FUZZ: B5K (I recommend using a C5K here to make the control more usable)
VOLUME: A100K
TOP: B25K
Start with the trimmer set so that the Q3 collector is about half the supply voltage and adjust from there.
Unless otherwise specified, all voltage measurements are with respect to ground.You mean trim to 4.5V between q3 collector and ground?
I built mine with the bias control as an external pot; the sweep is actually pretty subtle and I keep meaning to swap out a different value to see if it can go into gated/zippery territory.
No.
(I answered that earlier )
Look on the other side of the board xDWhat value pots are you supposed to use, I’ve got my board ready and my enclosure drilled but there’s still no build doc up yet
wow ?Look on the other side of the board xD
... Took me a while to notice xD
About to give the Bias pot a shot. You mentioned also lowering R6 from 46k to 33k for a wider range. Looking at the schematic I’m wondering if the same could be achieved with lowering R8 instead of R6 and if one would be better than the other? Please excuse my ignorance if this is a dumb suggestion.Unless otherwise specified, all voltage measurements are with respect to ground.
Making the BIAS pot larger will do it, try B25K. If that doesn't quite get you there, try lowering the 46K/47K resistor to 33K. The values you need for the collector resistors depend on Q2 & Q3's hFE (mostly Q2).
Of course. I have it socketed just in case. I was just curious why R6 and not R8. I socketed both to see for myself. Figured I’d also ask.Measure Q3-C first, you might not need to change any resistors.
Once you make & report your measurements, then we'll know what to do next.
If Q3-C is too high for any trimmer setting, then lowering R8 will only make it worse.