Found in Electronic Design, this circuit with the 555 has the extended times by using the transistor in the timing network.
This circuit with variable capacitance diode (varicap) is from a publication from the 90s. The...
With this circuit it is possible to divide the frequency of a rectangular signal by values between 2...
The presented circuit uses an optocoupler to trigger a triac. We found it in a Popular Electronics from...