Control switch (CB9264E)

Found in a 1969 EDN, this circuit uses components from that time. Modern equivalent transistors can be used.

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Pierce Oscillator (CB25680E)
This version of the Pierce oscillator with the 2N3904 was found in the January 1994 issue of...
Non-Inverter Amplifier 741 (CB16812E)
The traditional configuration of a non-inverting amplifier with the operational 741 shown in the...
Sensitive photocell (CB22533E)
This circuit is from a Radio Electronics from January 1958. The transistor is the CK722, and the...