The use of a diac improves the performance of the two dimmers in the previous circuits. The circuit is from the same Radio Electronics magazine in an article that teaches how to use triacs.
Frequency and active cycle of this circuit are fixed by the two crystals that may have different...
We found this circuit in an English documentation. The circuit is current, being the transformer used 9 V...
We found this symmetrical power supply circuit in an Electronics Now magazine from August 1998. The...