Found in Electronic Design, this circuit with the 555 has the extended times by using the transistor in the timing network.
The circuit in the figure shows that it is an oscillator driven directly by the conduction of Q1...
Depending on the output transistor used, this transmitter can provide power from 1 to 3 W. The...
The circuit presented is suggested by Mullard (Philips) in an old manual. The circuit uses a...