Based on NE555 this circuit turns on and off the IC output by a momentary switch. In other words it works as a mechanical latching relay, but the circuit backs to the start condition when you switch ...

The diagrams and photos show how to wire up the fuel pump and oil-pressure switch to a commonly available, industry standard, ISO-type "1 Form C single pole/double throw" (SPDT) relay.

Two Momentary Switches to a Maintained Switch Dec 6, 2007 12:00 PM Most remote controls provide ample momentary closures for a command, but there are times when a maintained closure is needed. This ...

When the start button is pushed, the SI relay picks up and its type-A contacts close, providing a current path after the start pushbutton is released. Other functions. A variety of specialized input ...