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Old 2nd October 2010, 05:40 PM   #1
M Gregg is offline M Gregg  United Kingdom
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Default Has anyone used this regulator?

Hi,

Has anyone used this regulator? I am refering to the HT side!

I am thinking of using a LM317T device in place of the LM317K because of low current requirements!

Does anyone see any problems with this?

Thank's for any input!

Regards
M. Gregg
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Old 2nd October 2010, 05:57 PM   #2
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Hi, it probably will work but it is playing with fire. The dangerous moment is when switching it on. Because of the quite large cap at the output it could be that the voltage over the 317 exceeds the max. values by a large margin. Maybe TL783 is a better choice.

I remember Elektor using a 400 V max. rated reg but unfortunately I don't remember the typenumber. That one was also a 3 pin reg.


I found a few regs using parts that are rated for such high voltages.

http://www.linearaudio.nl/t-reg-2.htm
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Old 2nd October 2010, 06:20 PM   #3
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by jean-paul View Post
Hi, it probably will work but it is playing with fire. The dangerous moment is when switching it on. Because of the quite large cap at the output it could be that the voltage over the 317 exceeds the max. values by a large margin. Maybe TL783 is a better choice.

I remember Elektor using a 400 V max. rated reg but unfortunately I don't remember the typenumber. That one was also a 3 pin reg.


I found a few regs using parts that are rated for such high voltages.

http://www.linearaudio.nl/t-reg-2.htm
I will have a look thank's for your interest
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Old 2nd October 2010, 06:27 PM   #4
M Gregg is offline M Gregg  United Kingdom
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Just for info I am restricted to a board size of 8cm x 5cm.

So you can see why I want to use a 3 pin reg.

Regards
M. Gregg
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Old 2nd October 2010, 07:39 PM   #5
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Do a search for Linear brief 47, by Michael Maida. Very easy circuit to build and can easily be built with your size requirements. Very similar to the circuit you posted, just less complicated and more stable. You could also use the regulator from Sy's Red Light District amplifier.
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Old 2nd October 2010, 07:45 PM   #6
Salas is offline Salas  Greece
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Better the Mosfet Maida, and a try with IRF820 may prove better in the highs.
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Old 2nd October 2010, 07:53 PM   #7
M Gregg is offline M Gregg  United Kingdom
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Thank's everyone I will research all information.
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Old 2nd October 2010, 08:03 PM   #8
M Gregg is offline M Gregg  United Kingdom
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Will the Maida circuit drop 400V to 250V?

Thought you might know the most you can drop across it?

Last edited by M Gregg; 2nd October 2010 at 08:22 PM.
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Old 2nd October 2010, 08:45 PM   #9
M Gregg is offline M Gregg  United Kingdom
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O.K.

Thank's everyone I will try the Mosfet Maida. I will let you know how it goes!

Regards
M. Gregg
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Old 2nd October 2010, 10:35 PM   #10
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Quote:
Originally Posted by M Gregg View Post
Will the Maida circuit drop 400V to 250V?

Thought you might know the most you can drop across it?
If you design it correctly and you provide an adequate heatsink.

I wouldn't try to drop any more power than you can safely dissipate with your heatsink or drop more voltage than your pass transistor can handle without breaking down. Other than that, you can dissipate 10000V if you can find adequate parts.

Last edited by SpreadSpectrum; 2nd October 2010 at 10:42 PM.
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