This circuit was found in a Popular Electronics from the 90s. The power source must be symmetrical and the operational amplifiers can be 741.
This circuit is from a 1967 US publication. The configuration can serve as a basis for designs...
The phasor is the ray weapon that we see in many science-fiction films. The characteristic sound can be...
This linear oscillator was found in a 1968 publication. The operational amplifier is from that...