HP-65 more on the card reader
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02-07-2019, 10:27 AM
Post: #58
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RE: HP-65 more on the card reader
(02-06-2019 07:00 PM)teenix Wrote:(02-06-2019 02:57 PM)albertofenini Wrote: In the scheme I have these looks like Inductor modules, which could be responsible for some noise. I quess the most likely problem is the andode driver. This also contains the circuit that generates the clock signals. Maybe one of the clock signals phi1 or phi2 has noise on it. If you want to get to the bottom of why one of the keyboard PCBSs doesn't work, I'd suggest looking at those clock signal. Here the anode driver is described in detail. Cheers, Harald |
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