What's this transformer good for?

[davepellegrene]

I've had this thing laying around for about 20 years or more and every time I do a clean out I keep this thing. Anybody know what I can use it for. It looks like it changes AC to DC power. What I don't get is why it's so heavy duty looking. It looks like it hooks up to 220 with heavy enough wire that it could be hooked up to a 50 amp breaker. I think it is something Diebold was using in some sort of bank system.





Dave

[killa]

Re: What's this transformer good for?

Says acme so you are obiously suppose to drop it on things such as roadrunners.

[davepellegrene]

Re: What's this transformer good for?

Says acme so you are obiously suppose to drop it on things such as roadrunners.

That's funny! I was thinking the same thing when I saw the acme.

[OlderMongrel]

Re: What's this transformer good for?

Dave, you can connect the inputs either straight (240) or in series (120) and the outputs similarly, as shown, to get either 12 or 24 v AC out. If you need 750 VA out (!) at 12 or 24 AC, there you go! Why you would need that, I can't imagine. Probably some industrial use that it was intended for.

Std disclaimer: DO NOT get into the mains to connect this unless you know what you are doing.

John

[JRT]

Re: What's this transformer good for?

Anybody know what I can use it for. It looks like it changes AC to DC power. What I don't get is why it's so heavy duty looking. It looks like it hooks up to 220 with heavy enough wire that it could be hooked up to a 50 amp breaker.

[ATTACH=CONFIG]33509[/ATTACH]

Dave

You can use that as the basis of a power supply to power opamps and unity gain buffers, good for powering a DIY preamp, headphone amp, active filters, etc. Its big for that application, but there is nothing wrong with that given that it is already paid for.

Parallel the two primary windings for use with 120 V AC and it will provide 12 V AC on each of the secondary windings.

Wire the two secondary windings in series, ground the center tap of that series connection, and connect the legs to a full wave diode bridge, as shown below.

[SirNickity]

Re: What's this transformer good for?

That would make a nice AC-to-AC (not DC) transformer for a multi-channel chip-amp. :-)

[Herman Trivilino]

Re: What's this transformer good for?

If you need 750 VA out (!) at 12 or 24 AC, there you go! Why you would need that, I can't imagine. Probably some industrial use that it was intended for.

Actually, it's 750 000 VA. Now that's a heavy duty transformer!

[thekorvers]

Re: What's this transformer good for?

I've had this thing laying around for about 20 years or more and every time I do a clean out I keep this thing. Anybody know what I can use it for. It looks like it changes AC to DC power. What I don't get is why it's so heavy duty looking. It looks like it hooks up to 220 with heavy enough wire that it could be hooked up to a 50 amp breaker. I think it is something Diebold was using in some sort of bank system.
Dave

This is an AC transformer. It does not convert AC to DC.

Depending on how it is wired, possible output voltages are 6, 12 and 24 VAC. Rectified with a full wave bridge and smoothing capacitors, but unregulated, ouput voltage will be + 8.5, 17 and 34 VDC.

At .75 KVA it is capable of substantial output current. However it's use as a power supply for an amplifier is limited as a high power one requires a higher voltage than this unit is capable of.

As someone mentioned above, it could be used for a multi channel chip amp, perhaps in an active setup or it could be used to power some automotive amps.

[thekorvers]

Re: What's this transformer good for?

Actually, it's 750 000 VA. Now that's a heavy duty transformer!

???

[Pete Schumacher]

Re: What's this transformer good for?

Actually, it's 750 000 VA. Now that's a heavy duty transformer!

It's .750 KVA. You must have missed the .

But if you had a bridged amp, you could make a 70W/ch 8 Ohm setup with quite a few channels. Maybe set it up as a 6 channel amp for doing a pair of 3-ways fully active.

[davepellegrene]

Re: What's this transformer good for?

So what's inside of it? The ends are epoxied shut I'm assuming for moisture protection. It probably weighs about 20 lbs. I'm guessing lead?

Dave

[Pete Schumacher]

Re: What's this transformer good for?

So what's inside of it? The ends are epoxied shut I'm assuming for moisture protection. It probably weighs about 20 lbs. I'm guessing lead?

Dave

High permeability steel lamination and lots of copper.

[dthomas]

Re: What's this transformer good for?

I've had this thing laying around for about 20 years or more and every time I do a clean out I keep this thing. Anybody know what I can use it for. It looks like it changes AC to DC power. What I don't get is why it's so heavy duty looking. It looks like it hooks up to 220 with heavy enough wire that it could be hooked up to a 50 amp breaker. I think it is something Diebold was using in some sort of bank system.

Dave

.75 KVA is 62.5 amps at 12V. So you could supply a lot of voltage at 12 or 24V. Also it would great if you need a very heavy duty battery charger. This likely was for a very specific purpose that required 12 or 24V and a lot of current.

It is probably heavy so it could always double as a boat anchor. Just kidding.

[1100xxben]

Re: What's this transformer good for?

This could be the start of a very stout 13.8V supply to power a car audio amp.

[charlielaub]

Re: What's this transformer good for?

It's .750 KVA. You must have missed the .

But if you had a bridged amp, you could make a 70W/ch 8 Ohm setup with quite a few channels. Maybe set it up as a 6 channel amp for doing a pair of 3-ways fully active.

The output voltage (max) is (being generous with AC to DC conversion) about 32V, single ended. That's just like 16.5 volt dual supplies. Into various loads, shown below, you will get different theoretical maximum power output from an amplifier running the output devices off of these rails:
8 ohms: 22W
4 ohms: 45W
2 ohms: 91W
1 ohm: 180W
I got these numbers by assuming that the output devices can drive the load to within 3V of the rails (typical for a class AB amplifier).

So, you could run a massively parallel chip amp into a low R load and get some good output power.

Another option would be to use the 12VDC wiring configuration, convert that to DC to get about 15V, and then power a car amp with it. Car amps have switching power supplies built in, and so can generate much higher rail voltages.

Either way, have fun with your boat anchor.

-Charlie