RTTY Demodulator (CB21760E)

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

Micro Voltage Regulator (CB1577E )
With the micro voltage regulator shown in the figure, we can design a power supply for small...
Astable MC3301 (CB6355E)
This circuit was suggested by Motorola in 1980s documentation. The circuit employs an operational of...
Touch Switch (1) (CB12186E)
We found this circuit in an English publication from 1980. It provides a logical output signal when...