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symmetric +-30V 10A linear adjustable PS with 723

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wolfentine

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lm317 lm337 3055 2955

hi!
any1 can "mirroring" a schematic diagram (initial made for positive but i want to build a symmetric PS with 723) for me?

"mirroring", here, =make negative regulated part of the PS with same configuration and complementary electronic parts :) (eq 3055>---2955 etc) :)))

10x!
 

Dmitron

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lm337 2955

Use LM337 with additional transistors
 

wolfentine

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Sorry,No. if i use 337 for negative section why wouldn't I use 317 for positive.
More points of view?
 

wolfentine

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i almost found it, but it need to be boosted and add adjusting current pot's
 

wolfentine

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need idea to make this to be constant current source (for constant current charging method)
 

nashwan

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hi
ur circuit seems like dual output voltage regulator...but there is no feedback form
the final point to regulation circuit .... and there is no short circuit protection...
u drive the base of 3 parallel 2N3055 with 1N4148 its just small signal diode..
i dont no why use 3 diode in serial may be to cancel 1.25V for lm317
...and that resistor 27/1w .. u use here 10000uf its big value for power supply
work with batt
i prefer to use LM338 adjustable from 1.2v to 32v with 5A
https://cache.national.com/ds/LM/LM338.pdf
 

wolfentine

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* sorry, wrong drawing, 4148s are 4001 i want to be. They are for start from 0V not from 1.25V
* yes, is no feedback
* short-circuit protection may wait (if i use it carefully)
* yes, 338 is better than 317 (even 317+3055 here)


but i have this "source" and i want to modify for 2 functions (manual switchable): constant voltage/current
 

wolfentine

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Green for constant voltage
For constant current I must dig much more
 

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