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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.
T Found in a 1992 Popular Electronics, this sophisticated circuit uses two speakers on a different...
We found this circuit in a 1995 documentation. It is a two-channel preamplifier for supplying a...
This timer was found in a 1980 publication. With the BC548 for Q1, an 8-ohm speaker with 6 V power...