6 V x 5 mA regulator (CB21537E)

This 6V regulator with FET was found in an old Electronic Design. FET and transistor admit modern equivalents.

555 Doorbell (CB25531E)
This simple circuit was found in the November 1992 issue of Radio Electronics magazine. It...
Pulse Generator for Thyristors (CB13802E)
This circuit generates pulses to trigger power controls with SCRs and Triacs. We found it in a...
FM demodulator for optical transmitter (CB25537E)
This circuit works with the previous two by demodulating the signals received modulated in FM. The...