Freezing sensor (CB21288E)

This circuit was found in a Popular Electronics from the 90's. The components are common. The potentiometer adjusts the circuit's trigger point.

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Complementary receiver (CB22493E)
Found in a 1966 documentation, this mid-wave receiver makes use of period germanium transistors. The phone...
Delayed Pulse Generator (CB15525E)
The purpose of the practical circuit shown in the figure is to generate a pulse of programmed...
LM3900 Voltage Controlled Current Source (CB14211E)
The circuit shown is from National Semiconductor's Linear Applications Handbook. The LM3900 is a...