Has anyone used this regulator?

M Gregg · 2nd October 2010, 05:40 PM

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

jean-paul · 06:01 PM

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

M Gregg · 2nd October 2010, 06:20 PM

Quote:

Originally Posted by jean-paul

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

M Gregg · 2nd October 2010, 06:27 PM

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

Lingwendil · 2nd October 2010, 07:39 PM

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.

Salas · 2nd October 2010, 07:45 PM

Better the Mosfet Maida, and a try with IRF820 may prove better in the highs.

M Gregg · 2nd October 2010, 07:53 PM

Thank's everyone I will research all information.

M Gregg · 08:22 PM

Will the Maida circuit drop 400V to 250V?

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

M Gregg · 2nd October 2010, 08:45 PM

O.K.

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

Regards
M. Gregg

SpreadSpectrum · 10:42 PM

Quote:

Originally Posted by M Gregg

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.

2nd October 2010, 05:57 PM	#2
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	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 __________________ It's only audio Last edited by jean-paul; 2nd October 2010 at 06:01 PM.

2nd October 2010, 08:03 PM	#8
M Gregg diyAudio Member Join Date: Jun 2010 Location: UK	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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2nd October 2010, 06:27 PM	#4
M Gregg diyAudio Member Join Date: Jun 2010 Location: UK	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

2nd October 2010, 07:39 PM	#5
Lingwendil diyAudio Member Join Date: Apr 2008	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.

2nd October 2010, 07:45 PM	#6
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Better the Mosfet Maida, and a try with IRF820 may prove better in the highs.

2nd October 2010, 07:53 PM	#7
M Gregg diyAudio Member Join Date: Jun 2010 Location: UK	Thank's everyone I will research all information.

2nd October 2010, 08:45 PM	#9
M Gregg diyAudio Member Join Date: Jun 2010 Location: UK	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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