Microphone balanced amplifier (CB9388E)

This circuit was found in an old American documentation. The integrated circuit used is uncommon today.

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Peak indicator with hysteresis (CB21973E)
The basis of this circuit is a CA3130 operational amplifier. The transistor can be BC548, and the...
Polar to Rectangular Converter (CB7903E)
This circuit, found in a 73 magazine for radio amateurs, is used in radio localization. The...
TTL Sinusoidal and Rectangular Oscillator (CB12075E)
This circuit is from an American magazine Popular Electronics of March 1991. The circuit produces both...