This circuit was found in specialized microwave documentation from the 1960s. The circuit makes use of a varicap, and the transistor is a microwave type.
This indicator makes use of an LM339 voltage comparator circuit that contains 4 internal...
This 3-channel sequential circuit, but which can be expanded further, uses triacs to drive...
This soft starter dimmer was found in a 1980s documentation. We can implement it with current...