This circuit is from an1966 General Electric documentation. The Triac can be equivalent to 6 A or more, mounted on a good heatsink. Any diac can be used.
This circuit was found in a 1994 documentation, but it can be easily assembled today, as it uses...
This 2.5 + 2.5 W amplifier was obtained from a 1975 Sperimentare magazine (Italian); The circuit uses...
In the figure we have a different configuration for an oscillator with the 555. This circuit was...