Insulated dialer (CB9464E)

This circuit was found in an 80's Electronic Engineering. The circuit uses a multivibrator with neon lamps and an optical coupling system.

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Operational Wien Bridge Oscillator (CB15072E)
We found this FET-stabilized circuit in an American documentation from the 90s. With the values of the...
Sound level meter (CB8224E)
This circuit with a bargraph scale was found in a 90s Popular Electronics. The circuit measures...
Low Frequency Mixer (CB14220E)
The presented circuit uses an LM3900, transconductance operational amplifier. It was found in the...