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-   -   47labs Gaincard rewire? (http://www.diyaudio.com/forums/chip-amps/66616-47labs-gaincard-rewire.html)

young_pup 24th October 2005 04:50 PM

47labs Gaincard rewire?
 
Anyone know how to rewire the Power Humpty to run at 220-240V?

Frustrated!

Richard

sith 24th October 2005 08:46 PM

Umm, u have bigger problem, if u want it on Euro standard voltage, it is 220V@50Hz instead of 110V@60Hz. Humpty doesn't have a switch to change operating area?If not then u're stuck with changing power tranny, but why on earth u want to do it? There must be Humptys working on 220V ??! :confused:

Christer 24th October 2005 08:56 PM

Even if there is no switch for changing voltage, the transformer might be a dual primary one. Presumably it is cheaper to use one single type of transformer for all units, than to have different ones depending on market. But maybe that goes against their philosophy somehow?

Peter Daniel 24th October 2005 08:59 PM

The pictures of PS can be found here: http://www.6moons.com/audioreviews/4.../gaincard.html

It is not clear if it's 4 wires or just two on primary.

Christer 24th October 2005 09:08 PM

Well, I assumed Richard had a unit he wanted to rewire, so he could just look inside and try to figure out it it has dual primaries. However, judging from the pictures in the link you provided Peter, I get a feeling the answer is no. On the close up of the transformer, we see the secondaries coming out on top, and at the botton there are two thick and two thin wires. If these had all been primaries, they would presumable have been the same width, so I guess one pair of wires is a third secondary for som purpose, and then the thin wires are probably the one and only primary.

Peter Daniel 24th October 2005 09:13 PM

From what I see, there are actually 3 thin wires on primary side: one of them, grey in color, looks like connected to earth ground, but again, it's not very clear.

Point is, the supply probably cannot be converted to other voltage.

Christer 24th October 2005 09:20 PM

Quote:

Originally posted by Peter Daniel
From what I see, there are actually 3 thin wires on primary side: one of them, grey in color, looks like connected to earth ground, but again, it's not very clear.

I can only see two, one blue and one grey, but if it is three, then presumably the transformer has a shield, which wouldn't be too much to ask considering what the thing costs. :)

Quote:


Point is, the supply probably cannot be converted to other voltage.

I agree, but it still doesn't hurt too look inside the actual unit instead of just relying on pictures. There might differences between units.

young_pup 24th October 2005 09:22 PM

looks like its only 120V
 
Took the humpty apart...has 3 wires to the power socket.

Maybe i can photograph...but it is also marked on the transformer 120V!

:(

Christer 24th October 2005 09:25 PM

So, it is most likely not rewireable. Maybe the cheapest and easist solution is to buy a step-down transformer from 230 V to 110 V.

Peter Daniel 24th October 2005 09:26 PM

So it means it cannot be rewired.

If you want, I can send you a toroid good for 230V and you'll send me the one from the Humpty. I was always curious how good they are ;)


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