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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Audio Level Indicator (CB22046E)
We found this circuit in an old English documentation. The JFET can be any general purpose and the...
WWV Converter (CB9329E)
With this converter it is possible to tune the signals of the 15 MHz WWV.in AM receiver. WWV is...
Car Amplifier Module (CB17114E)
This circuit is intended to reinforce old car radios, having been found in 1997. At that time,...