Simple to build isolation transformer that consumes less power than it gives out

[wattsup]

wattup, have you scoped what is the output waveform like, can you confirm if it is rectified sine wave ? If so, then at high frequency one could also say it is "DC with has component in it (SM)" or "dirty DC (TK)". Coincidence ?

@JN

I'll look into that tonight.

I do remember that when putting just a scope probe on each side of the load (no probe grounds used), one side sine wave was a good three times higher then the other and slightly off phase, I'd say about 25% off phase. I found that to be interesting but really don't know how to determine if the sine wave is rectified DC or simple AC.

My output volts meter only sees the AC.

wattsup

[TinselKoala]

How does one rectify DC and get a sine wave, anyway? Curious Koalas want to know.

[penno64]

OK Jack,

Have it wire per pg. 3 diagram and now the 60w bulb glows very dimly at 240v.

Guess its time to start adding caps?

Typically, what type and size should I be testing ?

Thanks, Penno

p.s. pic to follow

[Jack Noskills]

@JN

I'll look into that tonight.

I do remember that when putting just a scope probe on each side of the load (no probe grounds used), one side sine wave was a good three times higher then the other and slightly off phase, I'd say about 25% off phase. I found that to be interesting but really don't know how to determine if the sine wave is rectified DC or simple AC.

My output volts meter only sees the AC.

wattsup

Can you see the output waveform with and without load just in case ?
You see voltage amplification because your coils are not equal length. This creates different potentials in the junction before the load and hence some current flows through the coils. If coils were equal then this would not occur and all current would go via load. This is my interpretation.

[penno64]

As requested -

Changed bulb to 40w - as expected, begins to glow at lower voltage (I am using a 240 Variac for testing)

Wattmeter pre variac - 240v 0.07A and 10.2W

Inline digital ampmeter shows (in place of safety bulb) - .06 to .07A AC of course.

Begining to feel Wattsup was on the money. Maybe the coils 170ohms is to high for this exercise.

Let me know what you think. Thanks, Penno.