60 Hz Suppressor (CB6738E)

This filter is intended for 60 Hz noise suppression in amplifiers. We found it in American documentation from the 60s.

3V Zero Crossing Detector (CB20626E)
This 3 + 3 V symmetrical source circuit uses an old operational amplifier. The circuit is from an...
FSK Generator XR2206 (CB24511E)
This circuit for low frequency data transmission was found in the May 1977 issue of Radio...
Relay Control (CB21358E)
This circuit was obtained from an English documentation, with the purpose of carrying out the...