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.
The circuit shown in the figure is the version activated at the low level, of the previous circuit...
This circuit is from an old American documentation using LEDs in the rectification. The circuit...
This circuit consists of an emitter follower, presenting unit voltage gain implemented with an...