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Help to understand and build regulated power supply
Help to understand and build regulated power supply
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Old 1st October 2020, 08:40 PM   #1
Uylum is offline Uylum  Sweden
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Default Help to understand and build regulated power supply

ive got some toroidal 24v 200va dual windings

ive got 20 of them could not throw them away..
i have some elektronic knowledge.
i want to build power suply for an amplifier.


ive been looking at

13.8V 20A linear power supply


i like the design but i vant higher voltage. up to 40v

can someone help me with this?




and can i put transformers in parallel and series for higher voltage and va?





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Old 2nd October 2020, 02:13 AM   #2
PRR is offline PRR  United States
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Help to understand and build regulated power supply
> 24v 200va dual windings

24V AC to rectifier and capacitor will peak at about 35V DC. Two such schemes makes +/-35V DC. This is good for almost 70 Watts Sine in 8 Ohms. So one channel at 8 Ohms solid or 4 Ohms mildly saggy (maybe 110 Watts).
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Old 2nd October 2020, 01:56 PM   #3
Uylum is offline Uylum  Sweden
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but if i put 4 transformers in parallel i get more��
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Old 2nd October 2020, 07:24 PM   #4
Vovk Z is offline Vovk Z  Ukraine
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It depends on a load impedance.
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Old 2nd October 2020, 07:48 PM   #5
Galu is online now Galu  Scotland
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Quote:
Originally Posted by Uylum View Post
but if i put 4 transformers in parallel i get more��
I presume you are aware of the precautions to take when paralleling transformers?

Paralleling Transformers – An Electrician's Guide to Single Phase Transformers
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Old 2nd October 2020, 08:15 PM   #6
Uylum is offline Uylum  Sweden
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yes i am
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Old 3rd October 2020, 03:59 PM   #7
Uylum is offline Uylum  Sweden
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if i use this schematic as a start..

13.8V 20A linear power supply

and use 35v DC that is too high voltage for lm741 can i use voltage devider or do i have to use another op-amp
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Old 4th October 2020, 04:15 AM   #8
Rick PA Stadel is offline Rick PA Stadel  United States
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Not sure what you mean by 'voltage divider', but a couple resistors, a zener, small electrolytic, and a pair of lowly 1N4148's (just to keep the inputs within the '741s power supply range) should be all you'd need to add. And a long list of op amps aren't that keen on supply voltages higher than 36V, including most of the popular ones.

The bigger issue (for me, at least) is 'are you planning to use this very tightly regulated, high-current supply for the main rails of an audio power amp?'

Because we usually don't regulate the high-current rails that supply the output stage -- just too much loss in efficiency.

Cheers
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Old 5th October 2020, 03:42 PM   #9
Uylum is offline Uylum  Sweden
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i just want to tryout regulated powersuply and lern somthing at the same time
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Old 7th October 2020, 11:48 PM   #10
nigelwright7557 is offline nigelwright7557  United Kingdom
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Dropping 35VDC to 13V is quite a drop and would need to lose some serious power as heat.
Unless you get a switch mode buck converter to drop it down.
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Last edited by nigelwright7557; 7th October 2020 at 11:51 PM.
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