Found in an Elektor from the 90s, this circuit simulates a rotary switch that provides a BCD output from a 1 pole x 10 common position switch. The circuit can be powered by voltages from 3 to 15 V.
The OC30 power transistor is an old type of germanium from the 60s. This amplifier, using this...
PTT or Push to Talk is the control that switches the speak-hear function on a transceiver. This circuit...
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