4-scale millivoltmeter (CB7389E)

Found in Radio Electronics from the 90's, this circuit can be implemented with other operational amplifiers. The power supply is symmetrical.

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800 Hz Pulsed Tone Generator (CB25519E)
This circuit is recommended for alarm systems since it has a good output stage. The circuit is...
Gain 150 000 amplifier (CB6636E
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7 W amplifier (CB8946E)
No information is given about the transformers in this circuit suggested by Motorola in a 1968...