SCR Alarm oscillator (CB6114E)

This circuit was suggested by General Electric in a 1965 documentation. The circuit can be implemented with equivalent SCR.

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Telephone Monitor (CB12655E)
This circuit of a 1978 American publication monitors a telephone line by triggering a relay. The...
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Found in 1965 General Electric technical documentation, this half-wave circuit controls shunt type...
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The power supply shown in the figure provides voltages between 0 and approximately 15 volts, with...