Found in a 1960s RCA documentation, this circuit applies to most common triacs. The trigger device is a neon lamp and the sensor is an LDR. R is typically 100k and C is 220 nF.
This circuit was found in a 1967 RCA SCR manual. It uses period components that can be replaced with...
This circuit for the power grid was found in the June 1969 Radio Electronics magazine. The load is...
This fuzz effect is from a 1988 Italian publication, but it can be easily assembled, as the...