Frequency Base 555 (CB24503E)

This mains-synchronized circuit produces a simple 1 pulse per second. The circuit is from a Radio Electronics magazine from May 1977.

| Clique na imagem para ampliar |

Pulse generator 1 us (CB7481E)
This circuit was found in a 1977 Radio Handbook. The ports used are CMOS like 4001 and the...
Acoustic Relay (CB12635E)
I found this Vox circuit or acoustic receiver as it was originally called, in a 1973 publication. The...
Baxandall tone control (CB9372E)
Found in RCA documentation from the 90s, this bass and treble control uses an operational...