SCR photo control (CB8276E)

This circuit is from a 1968 Electronics World. It acts directly on a high voltage alternating current relay. The sensor can be a common LDR.

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Square Oscillator (CB23733E)
The circuit shown in figure 5 generates square signals based on a transconductance operational amplifier...
Power supply circuit (CB25185E)
By adding a transistor to the output and some polarization features we can obtain a higher output...
High Voltage Pulse Generator (CB26143E)
Found in the 1990 special issue of Radio Electronics Experimenter magazine, this circuit uses an...