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Older 67 card readers and 65 card readers
09-14-2022, 02:45 PM
Post: #2
RE: Older 67 card readers and 65 card readers
Looking at the circuit diagrams from Tony Duell, the capacitors are 2 x 22uF, a 6.8uF, and a 3.3uF on the motor. You could replace them with tantalum ones, say 16 - 25V rating.

There looks to be an extra 3.3uF cap on the 97, looks like it is used as a power up reset.

The red mark would indicate the positive end.

cheers

Tony
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RE: Older 67 card readers and 65 card readers - teenix - 09-14-2022 02:45 PM



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