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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Transducer 555 Oscillator (CB8119E)
This circuit was obtained in a 90’s Popular Electronics. The frequency depends on C1, a component...
Portable MW Transmitter (CB18515E)
This short-range circuit can act as a wireless microphone. We got the schematic and the printed...
XR205 Function Generator (CB24206E)
This sophisticated function generator circuit appeared in the September 1972 issue of Radio...