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.
We found this circuit in an American publication in 1975. The circuit generates an adjustable...
We found this universal preamplifier circuit in a March 1994 Electronics Now. It has several types...
This filter was obtained from a Linear Technology manual from the 1990s. The power supply must be...