30 kV Voltmeter (T1360E)

This circuit for negative 30 kV was found in a Radio Electronics dated April 1949. The circuit has an input impedance of 100 megohms.

Telephone Dialer (CB5979E)
This circuit is from the 80's, using an integrated of the time. The circuit serves as a reference,...
AC to DC Converter (CB5098E)
This circuit was obtained from an American 80's documentation. The operational ones can be...
741 Logarithmic Amplifier (CB25723E)
This logarithmic gain operating configuration was found in the June 1994 Electronics Now magazine. The...