Busy Line Indicator (CB18711E)

This busy line indicator is very simple, serving for analog lines. The supply is made by two batteries and the transistors admit equivalents.

| Clique na imagem para ampliar |

CMOS Driver (CB13776E)
This circuit is from a 1976 Motorola CMOS manual. It can be implemented with modern Darlingtons like...
Switching Regulator (CB14060E)
The circuit presented is from a 1972 RCA technical documentation. The integrated circuit consists of a...
MW FM SW Transmitter (CB16659E)
We found this transmitter circuit for different frequency ranges in a 1992 documentation. The...