This circuit protects the speaker from dangerous direct currents that could damage it. The circuit is from an Electronics Experimenter Handbook 1993 edition.
This circuit is suitable for testing motor starting capacitors. Capacitors from 2 to 8 uF are...
This circuit was found in a 90s Popular Electronics. The circuit uses 4 bicolor LEDs to indicate...
This circuit causes the light of a bicolor LED to change when it is turned on. The time of...