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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 is the factory version of the LM386 low-power amplifier. The sound quality is...
This circuit with transistors of the time was found in the magazine Radio Electroinics of June of...
This circuit charges a battery to power a flashlight at night. The circuit is from an English...