Battery Charger (CB26303E)

This automatic battery charger was found in a Popular Electronics from the 90s. The circuit uses a relay for automatic shutdown.

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Optical Pulse Modulator (CIR810E)
This circuit is suitable for applications such as a TTL log digital link. Maximum frequency is...
Intercom (CB16472E)
We found this simple wired intercom circuit with transistors in a 1988 publication. In addition to not...
Voltage Follower LM308 (CB4491E)
Other operational amplifiers can be used on this unit gain amplifier. The circuit is from the 1993...