Balanced Modulator MC1556G (CB14559E)

We found this circuit in Motorola's Linear Databook in 1990. The semiconductor component used is no longer common today.

Telegraphy Practice Oscillator (CB18342E)
This very simple oscillator, with only one transistor, was found in a Japanese magazine in 1967....
Simple sound bridge (CB6069E)
This simple bridge circuit can be used for impedance or resistance measurement using a high...
Light-controlled oscillator (CB7874E)
This circuit has the intensity of the signals controlled by the light that falls on the sensor....