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Electronics Schematics - L

Filament transformer adjusts line voltage:  08/21/03  EDN-Design Ideas / The problem: I couldn't use my Heath kit oscilloscope in a house I lived in during the 1960s because my lab was too far from the power-line input to the house, and the line drop through the house was substantial. Depending on the time of day, the screen would shrink to perhaps half the normal display size.

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