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Chip Amps Amplifiers based on integrated circuits

Vince's GC RPS
Vince's GC RPS
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Old 1st July 2006, 02:01 AM   #1
DJ Exprice is offline DJ Exprice  United States
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Default Vince's GC RPS

I was pondering the idea of being able to make a regulated power supply with high amperage (about 8 to 12 amps), and at 24 volts WITHOUT using a single "Adjustable" regulator. Only preset regulators.

I have done it. I have made a new kind of regulator:


BEHOLD the all new 8x7824 and 8x7924 voltage regulator.

Eagle screen shot below:
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Old 1st July 2006, 02:05 AM   #2
DJ Exprice is offline DJ Exprice  United States
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For those of you who have Eagle, here is the file no hassle!
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Old 1st July 2006, 02:58 AM   #3
tiltedhalo is offline tiltedhalo  United States
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Default parallel voltage regulators

If you have not built this yet be carefull, the error voltage correction can be as high as 1.5% on adjustable or fixed regulators even with load shareing resistors that difference will cycle the regulators to full current then thermal shutdown and then repeat the cycle one after another, you will never see any current gain.
Try useing an adjustable with an op amp comparator to sync the regs.
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Old 1st July 2006, 03:32 AM   #4
DJ Exprice is offline DJ Exprice  United States
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An op amp comparator? I know that the regulators must be synced up, but on the national website, they said it was okay to put regulators in parallel as long as you put a very low ohm resistor on the output of each of the regulators. Is that enough to say this is a good idea; or is it a big...... ?
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Old 1st July 2006, 04:52 AM   #5
tiltedhalo is offline tiltedhalo  United States
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Default parallel voltage regulators

A tidbit wright from National..........
http://www.national.com/an/LB/LB-51.pdf#page=1
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Old 1st July 2006, 05:01 AM   #6
DJ Exprice is offline DJ Exprice  United States
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No more of my idea I guess LM338 and LM301A are in! LM78XX and LM79XX are OUT
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Old 1st July 2006, 05:13 PM   #7
Khron is online now Khron  Finland
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About a week ago, i "cooked up" a pair of high-current adjustable v-regs, using 5 paralelled LM317's and 5 LM337's, on separate pcb's, with summing resistors on each chip's output. I can attach the pcb's if anyone's interested...
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Old 1st July 2006, 05:26 PM   #8
DJ Exprice is offline DJ Exprice  United States
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Yes please!

Could we also have some Eagle Files? That would be great!
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Old 1st July 2006, 05:42 PM   #9
Khron is online now Khron  Finland
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These have only been drawn up in Eagle, no actual boards etched / populated yet

Positive regulator, 11A / 16A (typical / max)
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Old 1st July 2006, 05:43 PM   #10
Khron is online now Khron  Finland
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Negative regulator, 11A / 16A (typical / max)
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