This interesting circuit in which the LED display is circular imitating a common clock appeared in the Radio Electronics magazine of May 1977. The power supply is included.
This circuit is designed to control static loads fed by direct voltage. The circuit is from...
The 4046 PLL is uncommon these days. This circuit was found in the August 1994 issue of...
This two-transistor circuit was found in American documentation from the 1990s. The circuit can use...