Full wave rectifier filter (CB7582E)

This circuit was found in a Popular Electronics from the 90s. The power source must be symmetrical and the operational amplifiers can be 741.

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Negative Feedback Stage (CB6131E)
This circuit is from a 1967 US publication. The configuration can serve as a basis for designs...
Phasor Sound (CB9212E)
The phasor is the ray weapon that we see in many science-fiction films. The characteristic sound can be...
Oscillator with constant current load (CB8038E)
This linear oscillator was found in a 1968 publication. The operational amplifier is from that...