Two-input amplifier (CB21661E)

The critical component of this 1967 amplifier is the driver transformer. The circuit has both high and low impedance input.

Oscillator up to 50 MHz (CB23739E)
The frequency of this oscillator depends on the crystal used and the transistors. The circuit was...
MOSFET Stage (CB25576E)
This circuit shows how to use the 4007 MOSFETs in an amplifier stage. We found it in an...
Touch Sensor (CB18350E)
This circuit was found in a 1967 Japanese documentation. It consists of a touch control system with...