Ammeter (CB9660E)

This current meter with many scales was found in a 80s American documentation. The operational amplifier is from that time, uncommon nowadays.

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Astable 555 with two potentiometers (CB25510E)
This circuit has both frequency and duty cycle control. We found it in the October 1992 Radio...
12 V x 2 A power supply (CB11911E)
This power supply is indicated for the supply of not very powerful car radios of the AM and FM...
Carrier Switching Transmitter (CB14896E)
In the absence of a modulation signal, the carrier of this simple short-range transmitter is cut...