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Gday Allan
Just interested in how you interpreted the 2.2V from the pdf,
as its very light on other details ( ie like where ground is )
A mate wandered round today with a QHY8L that was/is showing problems.
When i stuck a CRO on it as per the instructions, i got a pulsetrain whilst processing but it was only about 0.3V pk-pk.
Adjusting the pot as per instructions appeared to adjust the DC bias only,
ie it stayed as a 0.3V pk-pk waveform, but adjusted its DC bias.
The pdf supplied says the upper edge of the waveform should be 2.2v but it doesnt clearly indicate whats zero.
If i assume a DC bias of zero is what is required for operation, then the waveform should be about 4.4V pk-pk and the pot merely sets the DC bias to zero.
What did you end up seeing?
Andrew
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