This sequential circuit of LEDs was found in a Popular Electronics from the 90s. The circuit can be programmed and an adaptation consists of using optical couplers to drive power loads.
This circuit is from 2005 documentation. It automatically starts an irrigation pump when the...
This resistance meter circuit was found in the February 1984 issue of Radio Electronics magazine. It is...
In addition to keeping a battery constantly charged, this circuit only lights lamps when it is...