Yes, I too had to see what all the fuss is about.
It had to be minimum cost, so I looked arround my tiny dorm room, to see what I got.
Inspired by the Sun GC, I lay my eyes on two old AGFA external SCSI discs. These things are large 4Gb discs from an old graphics system I believe. I pulled the SMPS, fan and the disc, a 5,25" by 8 cm tall monster.
Next thing: Transformers. Not much to choose from, but I got a few 2x37V @ 1000VA toroids. Hmmm... too much voltage, then I'll just take and series two of them at the primarys and then parallel the secondarys. Tadaaa - a 2x18V @ 2000VA.
The GC is inverting and the most simple design I could find. Just the LM3886, two ELNA RJH 1000uF caps (had to buy these) and two resistors (1% metal film). Ofcouse, I need another resistor to bypass the mute function, so that's three resistors.
It had to be minimum cost, so I looked arround my tiny dorm room, to see what I got.
Inspired by the Sun GC, I lay my eyes on two old AGFA external SCSI discs. These things are large 4Gb discs from an old graphics system I believe. I pulled the SMPS, fan and the disc, a 5,25" by 8 cm tall monster.
Next thing: Transformers. Not much to choose from, but I got a few 2x37V @ 1000VA toroids. Hmmm... too much voltage, then I'll just take and series two of them at the primarys and then parallel the secondarys. Tadaaa - a 2x18V @ 2000VA.
The GC is inverting and the most simple design I could find. Just the LM3886, two ELNA RJH 1000uF caps (had to buy these) and two resistors (1% metal film). Ofcouse, I need another resistor to bypass the mute function, so that's three resistors.
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Man, I whant those toroids
Thomas,
Congratulations, it's very nice.
Oh, and those toroids...
You talk about sinsitivity from light switching.
And what about mobile phones?
Yes, that's why I'm going to connect my case to earth (with a resistor and a cap), it seams to be the solution.
Now, enjoy the music.
Thomas,
Congratulations, it's very nice.
Oh, and those toroids...
You talk about sinsitivity from light switching.
And what about mobile phones?
Yes, that's why I'm going to connect my case to earth (with a resistor and a cap), it seams to be the solution.
Now, enjoy the music.
Re: Man, I whant those toroids
Do you think the toroids' too much?
I have a small mains filter lying around, I'll try to see if it helps. Don't own a cell phone at this moment and don't wear a watch either. I kinda likes to be 'free' from all these things when I'm out.
carlosfm said:Thomas,
Congratulations, it's very nice.
Oh, and those toroids...
You talk about sinsitivity from light switching.
And what about mobile phones?
Yes, that's why I'm going to connect my case to earth (with a resistor and a cap), it seams to be the solution.
Now, enjoy the music.
Do you think the toroids' too much?
I have a small mains filter lying around, I'll try to see if it helps. Don't own a cell phone at this moment and don't wear a watch either. I kinda likes to be 'free' from all these things when I'm out.
Magnetmaz said:
You still draw the same amount of current, right?
The transformer won't ruin your diodes regardless of it's potential, unless you draw a serious ammount of (startup) current from it. You can also draw verry large currents, short term, from smaller transformers.
Unless you have large capacitor banks, the diode rating should only follow the load current (and some safety margin). If you use large caps, like in class-A designs, you may have to compensate for a large inrush current.
I use a single 50A bridge for all 6 channels (when done). But GC's don't have much inrush current, so this is almost as ridiculous as 2KVA toroids.
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