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Old 7th December 2002, 10:29 PM   #11
paulb is offline paulb  Canada
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Default Re: high volt/high current DIY home PS.

Quote:
Originally posted by deepanger
wanna to build a good reliable home PS. which can provide up
to say 10A with regulated + & - volts up to say 40V.
i know itsnt that easy project to build ...
but anyone has schematics for a similar PS.?
or even a good design guide?
thanks..
Before you go any further, calculate how much power your supply will need to dissipate. Take the voltage range (say, 10 to 40V); add about 5 volts overhead; multiply by the current you want (10A). The worst case is when the supply is set to the lowest voltage at the highest amperage.
For these numbers, that's 350 watts. Per rail. The most heat you can pull from a transistor or regulator is probably about 50 watts, so you will need at least 7. Per rail.
You'll also need several large heatsinks. If you can find pictures of a 70 watt Class A amplifier, that will give you a rough idea of the size. Huge. Per rail.
As for schematics, there's a big power supply at www.sound.au.com (project 77) that could be modified to do what you want.
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Old 8th December 2002, 05:01 PM   #12
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Default The APEX PA88 is about $100 ea.

and it's SOA just isn't up to discretes -- at least if you want to pull 100ma at 400VDC -- I think the questioner, however, would be OK with an LM317HV, a little more expensive than an LM317, and a Pass transistor to do the heavy lifiting/current limiting etc. and if you don't want to invest in an LM317HV just lift the ground leg by inserting a zener.
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Old 8th December 2002, 05:40 PM   #13
halojoy is offline halojoy  Sweden
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Default The APEX PA88 is about $100 ea.

Quote:
Originally posted by jackinnj
and it's SOA just isn't up to discretes -- at least if you want to pull 100ma at 400VDC -- I think the questioner, however, would be OK with an LM317HV, a little more expensive than an LM317, and a Pass transistor to do the heavy lifiting/current limiting etc. and if you don't want to invest in an LM317HV just lift the ground leg by inserting a zener.
$100 !!!!!
I had no idea.
seems APEX is nothing for me (or anyone)
Imagine(tm)John Lennon), what we DIY selvers can do with an amount of 1000 swedish crowns (skr)
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Old 9th December 2002, 12:34 AM   #14
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Default in memoria

of course, when you mention Lennon, I have to point out that this week marks the anniversary of his death. seems it 's more important to gen X'r than to those of us who experienced the Fab 4 first hand -- my sisters went to see them live, but I preferred the DC5.

Jack
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Old 9th December 2002, 05:44 AM   #15
CryingDragon
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Default There ya go,stone

See when people get older alot of them become bitter and look down thier nose at people because they think they know more or have had a harder life and we're "no good young whipper-snappers" (whatever the hell that is),But you,see you have respect for us,you have a good sence of humour and you don't look down on others...keep it up,it's very refreshing.
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Old 9th December 2002, 10:52 AM   #16
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Default Re: high volt/high current DIY home PS.

Quote:
Originally posted by deepanger
wanna to build a good reliable home PS. which can provide up
to say 10A with regulated + & - volts up to say 40V.
i know itsnt that easy project to build ...

but anyone has schematics for a similar PS.?
or even a good design guide?

thanks..
Everything you want is in this thread: "Bench power supply" - use search to get to it.

Jan Didden
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Old 9th December 2002, 11:18 AM   #17
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thanks all for ur replies..
actually amnt that good in PS. design solutions ,, so theres some
stuff icant understand and may u enlighten me in them..

* whats that dissipation prob. with the low volts, and whats the
range of the volt "being low"?

* whats the "variac" ?
* whats the current consumption for the P3A project (+35,-35v)?

thanx again..
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Old 9th December 2002, 11:37 AM   #18
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Quote:
Originally posted by deepanger
thanks all for ur replies..
actually amnt that good in PS. design solutions ,, so theres some
stuff icant understand and may u enlighten me in them..

* whats that dissipation prob. with the low volts, and whats the
range of the volt "being low"?

* whats the "variac" ?
* whats the current consumption for the P3A project (+35,-35v)?

thanx again..
Dropping the voltage anything more than about 10volts is going to result in a MAJOR heat problem if you use linear regulators... With high current loads... ever medium loads.. for that matter, don't use linear, ITS CRAZY!!!
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Old 9th December 2002, 02:03 PM   #19
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Default My Power Supplies

These usually go from $19 to $40 on EBay -- HP6129C, HP6130C. The big boy will put out a steady +/- 50V at 5 amps -- Industrial Style!!
The reason for the low price being -- shipping which will give you a heart attack, access to voltages at the rear, and, lastly you need some modest skill at building a programmer as the voltage steps are decimal powers of 2, 2's complement for negative voltages. They are a really good buy -- I've gutted one for an amplifier, but use the others. They don't program over GPIB, but you could use a HP3488a controller and relay board to accomplish this.
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Old 9th December 2002, 03:49 PM   #20
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Default Re: My Power Supplies

Quote:
Originally posted by jackinnj
These usually go from $19 to $40 on EBay -- HP6129C, HP6130C. The big boy will put out a steady +/- 50V at 5 amps -- Industrial Style!!
The reason for the low price being -- shipping which will give you a heart attack, access to voltages at the rear, and, lastly you need some modest skill at building a programmer as the voltage steps are decimal powers of 2, 2's complement for negative voltages. They are a really good buy -- I've gutted one for an amplifier, but use the others. They don't program over GPIB, but you could use a HP3488a controller and relay board to accomplish this.
i know that buying any of those commercial or industrial PS. will
be gr8 caz at least it gonna be more reliable than many of those
DIY ones,, but i wanna to build mine! something solid and reliable
,at least ill gain some knowledge and exp. working with hands..
thanks anyway.
does anyone can enlighten me in those points i asked about above..??
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