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This circuit was obtained in 1965 General Electric documentation. SCRs can be modern common equivalents. The circuit fires with positive pulses. The load can be up to 7 A.
This circuit was obtained in a 1991 Electronics Handbook. The publication no longer exists, but...
This is another possible version of a negative voltage generator using a 555 integrated circuit. The...
This circuit is from a 1965 Electronic Design. The transistors may be general purpose and the...