Heterodyne Mixer (CB4291E)

This is a typical 80's FM radio mixer circuit. The circuit was found in a documentation of the time.

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Optical door control (CB8273E)
We found this circuit in a 1966 documentation. The circuit is intended for a door opening system by the...
10 kHz Second Order Filter LM741 (CB25932E)
Unlike the previous circuit, this circuit has a low impedance input. The components can be changed to...
Nonlinear Gain Amplifier (CB6130E)
This nonlinear gain circuit was found in a 1965 Electronic Design. The configuration can be used...