These circuits were found in the February 1995 issue of Electronics Now magazine. The circuits have normal response in (a), boost in (b), cut in (c), and plate response in (d).
This circuit causes an LED to flash at intervals determined by C1 and R2 and for a duration given...
This 4-transistor amplifier can work from 4.5 or 6 V power supplies. We found it in a Mullard...
The purpose of this 2002 circuit is to monitor the functioning of ordinary incandescent lamps. These...