Originally designed to trigger a printer with a delay, this circuit can be used for other purposes. The circuit is from a Radio Electronics from September 1984.
In the figure we have a piezoelectric transducer drive circuit that can be used in conjunction with the...
This circuit is from a Ferranti publication of 1968. The circuit generates a signal according to the...
This is one of the possible triac power control configurations using as a trigger element a...