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We found this circuit in GE's 1977 semiconductor manual. The optical isolator uses an opto-SCR, and the lamp must be 25 W maximum. Only incandescent lamps should be used.
This triac circuit was found in the July 1995 Electronics Now magazine. The triac is based on the...
We found this circuit in a 90s Electronic Design. The circuit is based on a quadruple operational...
The transistor may be any general purpose, but the integrated transistor is not common today....