Phone Patch (CB9398E)

This circuit was found in a 1969 CQ magazine. It is intended for coupling telephones to radio amateur equipment

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Low Consumption Pulsator (CB20346E)
This circuit produces the ticking of a clock on a common piezoelectric transducer. The circuit has an...
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The basis of this circuit is a double T in the feedback, which has the components calculated to...
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This configuration was found in the Texas Instruments optoelectronics manual. PNP transistors...