Phase detector (CB8155E)

This circuit was found in a 1967 Electronic Design. The FET is from that time. Capacitor C is determined by the frequency of the signal worked.

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Current to Voltage Converter (CB6101E)
This circuit was suggested by Analog Devices in 1980s documentation. The circuit has a grounded...
Board Corrosion Catalyst (CB16858E)
Sound waves applied to the printed circuit board corrosion tank can speed up the process. The idea...
Ammeter (CB23646E)
In the figure we have the circuit of a multi-range ammeter using a 50 uA full-scale instrument. The...