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johansen
Posted: March 21, 2012 09:15 am
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user posted image

So i've been using this off and on, and i've decided to get rid of it after blowing it up a few times.

so if you do accept my offer, you're not getting the box, just the transformer.
i'll throw in the meters if you want but there's no calibrated shunt or anything, unfortunately.

there's 5 secondaries.

1 at 8.3vac
1 at 8.3vac with a tap at 7vac.

1 at 42vac
1 at 42vac tapped at 26vac.
1 at 500 vac, connected to a 2 uF capacitor,
(which is used to make a constant voltage and current limited transformer (rather well built actually, A text book case of how to do it properly) and has excellent regulation as well as current limiting, you will not be able to fry this transformer)

The way it works is rather complicated. the 20 amps at 6v battery charger is based off of a single 8.3 vac winding half wave rectified, in parallel with the 7.0vac winding half wave rectified, to give you what would normally be a center tapped output, but its not symmetrical.

the 12vdc battery charger rated to 10 amps is simply both 8.3vac windings in series and full wave rectified.

the other two windings are used to get the -15 or 0-30vdc variable.

simple math will ilustrate that the peak voltage output for both the 6vdc and 12vdc battery chargers are well in excess of full charge, and that is indeed the case, at a full charge you're still going to get about 1 or 2 amps of current into the battery. this is normal. its up to you to terminate the charge.

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MacFromOK
Posted: March 21, 2012 02:46 pm
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QUOTE (johansen @ March 21, 2012 03:15 am)
so if you do accept my offer, you're not getting the box, just the transformer.
i'll throw in the meters if you want but there's no calibrated shunt or anything, unfortunately.

I'll pay shipping for the trafo and meters (and any other parts of it you don't want).

USPS is probably cheapest, especially if it fits in a flat-rate box. Just don't use DHL unless absolutely necessary (they ship stuff to Oklahoma City, then USPS it from there anyway).

Feel free to ship the meters separate if you think that's safer than boxed with the trafo.

PMed you my address. beer.gif

[EDIT] Argh, typo on the zip code, so check for two PMs. doh.gif


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johansen
Posted: March 21, 2012 10:00 pm
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yes it will fit in a flat rate box, i wasn't able to post a photo last night
user posted image

its about 6 inches wide.

The volt meter is non functional.

The best way to make a dual 6v/12v battery charger out of it is to just use two rectifiers and a single DPDT switch to switch the battery terminal leads from one rectifier to the other.
The wafer switch that it used to do that couldn't handle the current.


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MacFromOK
Posted: March 22, 2012 02:22 am
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I'd like the volt meter too, might be able to use the scale if nothing else.

Looks ok to me, let me know how much and how you want to be paid. beer.gif


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MacFromOK
Posted: March 30, 2012 06:26 pm
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The package arrived today (thanks!). thumbsup.gif

Sweetie is going to town in a bit and she'll drop off payment at the post office, so it should go out today.

I noticed you didn't send the volt meter though. Any particular reason? huh.gif

Thanks again. beer.gif

[EDIT] Btw, are these Schottkys known good or should I test them?


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johansen
Posted: March 30, 2012 09:16 pm
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Those diodes are good, they are a high enough voltage they can work for the 12v side too.
(almost big enough they won't need a heatsink!)
The volt meter was accidentally thrown away when i forgot to take it out of the case, it didn't look anything like it does in the photo (which was taken 2 years ago). i think it even had a hole in the middle of the scale.






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MacFromOK
Posted: March 30, 2012 11:10 pm
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Lol ok, no problemo on the meter. Thanks again.

And... the check is in the mail... laugh.gif


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