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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Driver for Electric Typewriter (CB6561E)
This circuit was found in a Philips documentation from 1966. Its purpose is to drive the solenoid...
PWM Motor Control for 3 to 12 V (CB899E)
This circuit can control the speed of Motors up to 2 A and voltages in the range between 3 and 12...
Arbitrary Reference Inverter Amplifier LM3900 (CB5041E)
In other circuits we have seen a circuit for this application whose calculations have been...