Lundahl Mains transformer, LL2749

Mains Transformers LL2749

C-core mains transformer for 2 x 40V/ 2A (or 2 x 20V/ 4A). The core is assembled with a small air-gap to compensate for any mains DC-unbalance. Estimated power rating 250 VA which can be increased with good cooling. Magnetic stray is extremely small if secondaries of the two coils are loaded identically, as suggested below.

Weight 2.5 kg

Copper resistance, no load output voltages and max recommended transformer current (rms) with primary connected to 230 V serial / 115V parallel and Sec 1 connected as above

Primary res. Serial/parallel: 10 Ohm / 2.5 Ohm
No-load impedance: 2k / 230V 0.5k / 115V
Sec 1: 0.5Ohm/ 42 V 2.5 A

Voltage will drop approx 5% at nominal current