High impedance millivoltmeter (CB20611E)

We found this circuit in an old American documentation. The components are from that period and may present difficulties in obtaining them.

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Power switch without RFI (CB21543E)
This circuit was found in an Electronic Design from 1967. The circuit uses two triacs being T2...
96 MHz Oscillator (CB9624E)
Found in old American documentation, this circuit can use crystals between 27.5 and 33 MHz...
Relay control (CB22286E)
This shield from the 60's uses a germanium transistor of the time and a common type of relay of...