Surround Amplifier (CB25265E)

This circuit is from a Radio Electronics from December 1990. The circuit was used in a home theater system.

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Audio Booster (CB7103E)
This circuit is from a Popular Electronics from the 90s. Its gain is 22 dB and can be used as a...
Multiplex with transistors (CB23845E)
This circuit was found in an article in Radio Electronics magazine from October 1962. At that...
Integrator (CB14104E)
This circuit can be implemented with other operational amplifiers. The formulas for calculating the...