RTTY Demodulator (CB21760E)

This circuit was found in a 1977 radio amateur manual. Integrated circuits are operational amplifiers of the time.

Servo Motor Amplifier (CB12522E)
The circuit shown in figure 1 serves to control a servo motor with a current of up to 200 mA. The...
Voltage reference with REF01 (CB24681E)
This is a circuit with a period component that consisted of a voltage reference. The circuit is...
High impedance instrument amplifier (CB15801E)
This amplifier, suggested by National Semiconductor (Now Texas Instruments), has high input...