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I’ve had one of these pcbs sitting around and I am finally getting around to completing it. In the pdf built document it doesn’t give any information about the trim pot, what does it do? do I need to adjust it? any insight would be great.
Hi,
The trimmer is to bias the Drain of Q9. This should be half the supply voltage so aim for 4.5v to 6v ballpark.
Use your DMM, put it on V for voltage reading. Put the black probe on any ground and put the red probe on the Drain leg of the transistor. Turn the trimmer till your DMM reads 4.5v to 6v.
thank you!!
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