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Author Topic: Dual power supply  (Read 1370 times)
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MAXPAYNE
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« on: January 30, 2008, 08:51:21 20:51 »

Has sombody build the power supply on figure 2 (vsn 2) Huh is it working properly ?

http://sound.westhost.com/project44.htm
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Trishool
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« Reply #1 on: February 02, 2008, 01:23:09 13:23 »

Has sombody build the power supply on figure 2 (vsn 2) Huh is it working properly ?

http://sound.westhost.com/project44.htm

The schematic looks convencing for a lab powersupply but not for anyhing beyond that , what application you require powersupply for?.

Ts
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smartcat004
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« Reply #2 on: February 02, 2008, 04:40:09 16:40 »

I have confidence the circuit should work, you can't go wrong with these conventional regulators
except do remember to use a minimal heat sink if you are running  > 300 mA..

And anything above 1A means you need to make sure the heat sink is really a solid one with fins and the regulator body is thermally connected to heat sink(use the heat transfer paste materials...).

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MAXPAYNE
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« Reply #3 on: February 02, 2008, 09:09:33 21:09 »

The schematic looks convencing for a lab powersupply but not for anyhing beyond that , what application you require powersupply for?.

Ts

I will use as lab supply
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Trishool
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« Reply #4 on: February 03, 2008, 09:34:32 09:34 »

I will use as lab supply

Figure 2 , has better trimming and Adjustments , but temperature compensation isnt there . If you need that fine supply I can post here schematic how to temperature compensate it and rest of the issue I hope you can integrate on your own .
BTW: what Load/Line regulation you need?

Ts
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MAXPAYNE
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« Reply #5 on: February 03, 2008, 08:10:19 20:10 »

Figure 2 , has better trimming and Adjustments , but temperature compensation isnt there . If you need that fine supply I can post here schematic how to temperature compensate it and rest of the issue I hope you can integrate on your own .
BTW: what Load/Line regulation you need?

Ts

Thanks for uor reply. please post the schematic. line regulation may be 1%-4%
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Trishool
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« Reply #6 on: February 04, 2008, 08:00:15 08:00 »

Thanks for uor reply. please post the schematic. line regulation may be 1%-4%

Ahhh for that you dont need Temperature compensation . Your schematic is cool what is the confusion explain openly , such that we may find some remedy for it.


Ts
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MAXPAYNE
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« Reply #7 on: February 05, 2008, 02:16:37 02:16 »



Posted on: February 05, 2008, 07:14:54 07:14 - Automerged

Please suggest how can i chose R1, R2, R3 and R4 if i wanna 1A through each regulator and 3A through bypass transistor  for both positive and negative side.
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« Reply #8 on: February 05, 2008, 07:41:57 07:41 »



Posted on: February 05, 2008, 07:14:54 07:14 - Automerged

Please suggest how can i chose R1, R2, R3 and R4 if i wanna 1A through each regulator and 3A through bypass transistor  for both positive and negative side.

MAXPAYNE , There is no bypass transistor in the schematic you show. The transistors Q1 , Q2 are meant for fine regulation on the adjust pin , its a feed back loop topology.

Ts

Posted on: February 05, 2008, 07:36:17 07:36 - Automerged

MAXPAYNE , BTW 3A at max 24V is 72 Watts ? . Very big heatsinks , instead go for SMPS or I have a link below :
http://www.instructables.com/id/Converting-a-computer-ATX-power-supply-to-a-really/
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MAXPAYNE
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« Reply #9 on: February 05, 2008, 08:17:35 20:17 »

do u hae any adjustable swiching dc supply ? (0-30V)
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