This control circuit using a low voltage switch was found in the September 1987 Radio Electronics magazine. The triac must be matched to the load and the mains voltage.
This simulated circuit on the NI Multisim transmits modulated infrared signals with the audio...
This circuit is from a 1976 publication, but it can be easily implemented with a BC548 transistor. The...
This circuit for very long-time intervals was found in the March 1993 Radio Electronics magazine. Times...