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Recent content by ZRFun

  1. Z

    1990 tach op amp needed

    While calibrating my 1990 ZR-1 tach, the connection on the potentiometer I was using to determine the value for a fixed resistor, came loose. That resulted the op amp (tach driver) running wide open for a couple seconds before dying. :mad The numbers on the chip are- 9907A CS8939J Can...
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