Microammeter (T465E)

Found in a 1948 MIT documentation, this circuit uses a 0 to 100 uA microammeter as an indicator. The power supply is 150 V.

Pulse Modulated Inverter (CB15990S)
This inverter, suggested by Motorola, converts a voltage from 8 to 20 V into 28 V with a maximum...
High Impedance Instrumentation Amplifier 741 (CB4934E)
This high impedance circuit for low voltage sensors was found in a 1980s documentation. The JFETs...
Metal Detector – Receiver (CB24666E)
This is the receiver for the above circuit published in November 1980 Radio Electronics magazine. The...