Dual rails from one primary
11 parts
Two multi-winding variants, both real mutual-inductance models. Top: TX12's two isolated secondaries hang off one 120 Vrms primary — ground one end of each, point the diodes opposite ways, and a single mains winding makes ±15.6 V rails (half-wave each, so the 2.17 Vpp ripple sits at 60 Hz, not 120). Bottom: TX21's two primaries wired in series across 240 Vrms — series doubles the effective primary turns, and its secondary lands on the same 12.0 Vrms the top cell gets from a single primary on 120 V. That series/parallel primary choice is the universal-mains trick printed on real transformer datasheets.
- V1 120Vrms·60Hz
- TX121 1:0.1
- D1
- D2
- C1 470µF
- C2 470µF
- R1 220Ω
- R2 220Ω
- V2 240Vrms·60Hz
- TX211 1:0.1
- R3 220Ω
