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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 circuit was found in an English magazine from 1973. The magazine no longer exists, but the...
This radio version of 1 transistor, extensively explored on this site and in this section, is from...
This dual control was based on Texas Instruments documentation for the CD4050. The circuit has two...