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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.
Based on an integrated circuit CA31062 which consists of a photosensor, this circuit was obtained from...
This 500 V line current monitor with the LTC6101 was obtained from Linear Technology's own 2005...
This is one of many timer settings with the 555 found on this site. This is the traditional...