Using an AC-to-AC wall wart transformer/adapter in reverse

Exactly the same

Reply to
tnom
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Probably not 10 times but more like 3 or 4 times more reactance than resistance for the relays.

Reply to
Ralph Mowery

On 2/8/2009 4:13 PM Ralph Mowery spake thus:

As pointed out, at a low frequency like 60 cps*, DC resistance = impedance to a good first approximation (in other words, close enough for gov't. work).

  • Cycles per second, the true measure of frequency. What's this "hertz" bullshit? Since when did a car-rental company come into the picture?
Reply to
David Nebenzahl

When the reactance is 3 or more times the DC resistance that is nowhere near enough for gov't work. The coil will smoke if you use the DC resistance even at 60 cps. if the power supply will put out the current.

Oops , forgot about the big bailout going on now by the government and the big crash that is going on now. That banking and loan calculations were good enough for gov't. work. It smoked too.

Reply to
Ralph Mowery

Get one. They are very common, plentiful, and cheap. If you were in Kitchener Waterloo I'd GIVE you one.

Reply to
clare

Shucks, I wish I were there ... but would it handle say 20A @ 120VAC? To run a heater. I just paid $20 for a 30A relay, waiting for it to get here ...

Reply to
Matt

On 2/8/2009 4:44 PM Ralph Mowery spake thus:

Nonsense.

Don't believe me? Get ahold of an 8 ohm speaker and measure the resistance (DC resistance) using a DMM. It'll be within 10% of 8 ohms, which is the rated *impedance*. And this covers the audio spectrum (up to 20 kHz).

It's a figure of speech, my man.

Reply to
David Nebenzahl

No, it is rated at 15 amps, I think.

Reply to
clare

You know of course that it can only handle very small current levels and that it would need the original output circuits would will be handling 120V when they are only insulated for 12Volt

In short, it is a bad ideal Get the right tool for the job.

Joseph E Meehan

Reply to
sligoNoSPAMjoe

Yes, and AC output wall wart should provide the needed voltages. However, we don't know if the application would work just fine. How many watts of 24 VAC do you have, and how many watts of 110 VAC do you need?

Should be able to convert 24 VC to 110 VAC. You won't have much amperage to use, on the 110 VAC side.

Reply to
Stormin Mormon

You are mis-reading him. The low voltage goes IN the low voltage side, making the high voltage go out the high voltage side so everything is operating within it's design parameters insulation-wise.

Reply to
clare

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