100 kHz VCO (CB21489E)

This voltage-controlled oscillator was found in a 1965 Electronic Design. Transistors are from the time, and modern equivalents can be tested.

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Thermometer using aTransistor as Sensor (CB14021E)
We found this circuit in an old English documentation from the 70s. The transistor can be a modern...
Triangular and Square Generator LM3900 (CB14194E)
We find the circuit below in the 1994 Linear Applications Handbook by National Semiconductor. The...
G7L x Power Relays PCB (COM186E)
January 2017 - Omron G7L-x relays for PCB mounting can now be purchased from Mouser Electronics. These...