Found in 1969 RCA documentation, this dimmer uses a dual time constant setting to achieve better control of the triac's trigger point.
This conventional 4 channel circuit with the 4017 and 555 was found in the November 1991 Radio...
Found in documentation from the 1980s, this circuit makes use of discrete components of the time....
This circuit was found in a Popular Electronics of the 90s. The resistor R4 determines the load...