High and Low Trim readings

[csavetman]

I just finished a Quaverato build. All went well. Seems to work fine.
I measured the gain trim and high and low trim values with multimeter and got appropriate readings (around 65k for gain trim, 3.25 k for high trim and 5k for low trim). After which, I soldered the jumpers.

Later however, I went back to double check some readings and now I’m getting around .98 k for high trim and 1.4k for low trim. Gain trim is unchanged.

Should high and low trims change after soldering the jumpers?

thanks
Carlos

[brach]

Yes, the resistance across the test points connected to the high and low trim pots will change after you solder the jumpers. The Hi and low trim pots need to be measured and set while the jumpers are not soldered together. If you try to measure them while the jumpers are soldered the bias voltage from the opamp will skew the resistance measurement on your meter. You can always adjust them while the jumpers are soldered by listening to your guitar tone and making adjustments accordingly, but if you want to use your meter to set them you’ll have to remove the solder jumpers first.
Thanks for asking.
-Brach

[csavetman]

Ok, got it. Thanks!

Carlos

[Author]

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