Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Power Supply for Starving Student hybrid?
Power Supply for Starving Student hybrid?
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 24th January 2017, 07:34 PM   #1
Cata1yst is offline Cata1yst
diyAudio Member
 
Join Date: Mar 2016
Default Power Supply for Starving Student hybrid?

Hi.

So im trying to build a clean 48v psu for the starving student hybird. Mostly people use a POE injector psu, but theres been a few cases of the floating ground building up charge and frying a DAC. cisco power supply, grounding and the Millett starving student

Since im not a student any longer I'd like to start with a solid foundation providing power and make small improvements here and there to the amp.

Could use any resources to guide me in building a 48v psu. I have a basic undergrad grasp on full bridge rectifiers, bjts, etc, but have never built anything from scratch. I wouldnt mind going with something thats been designed before, but from what I've seen not too many popular diy designs ("the wire", sigma 11) push up to 48v (granted those are meant for ss applications)
  Reply With Quote
Old 28th January 2017, 09:31 AM   #2
AndrewT is offline AndrewT  Scotland
R.I.P.
 
Join Date: Jul 2004
Location: Scottish Borders
A 35Vac transforer will get you pretty close to 48Vdc. Probably around 50Vdc to 51Vdc.
Do you need precisely 48Vdc? what tolerance is permitted?
Do you need single polarity supply, or dual polarity supply?
__________________
regards Andrew T.
  Reply With Quote
Old 1st February 2017, 06:28 PM   #3
Lingwendil is offline Lingwendil  United States
Now with high-fructose ASSAULT-gluten!
diyAudio Member
 
Lingwendil's Avatar
 
Join Date: Apr 2008
Location: Oakley California
Power Supply for Starving Student hybrid?
This guy, right?

http://www.pmillett.com/starving.htm

Power Supply for Starving Student hybrid?


I would be inclined to use a toroidal transformer from Antek, and a Maida (LM317 based) regulator.

$11, assuming you are in the US...
AN-0240 - 25VA 40V Transformer - AnTek Products Corp

Parallel the dual 40v windings for 600mA before rectification, should give enough headroom for a basic linear regulator to sit you where you want. Cheap too.

Here's a couple Maida style regs that would work well, just use a BIG heatsink and you should be fine... Of course you will need to change some resistor values to be able to set your output at 48V.

Click the image to open in full size.

Click the image to open in full size.
  Reply With Quote
Old 1st February 2017, 08:11 PM   #4
AndrewT is offline AndrewT  Scotland
R.I.P.
 
Join Date: Jul 2004
Location: Scottish Borders
looks like you need +48Vdc and -19Vdc.
__________________
regards Andrew T.
  Reply With Quote
Old 1st February 2017, 08:23 PM   #5
Lingwendil is offline Lingwendil  United States
Now with high-fructose ASSAULT-gluten!
diyAudio Member
 
Lingwendil's Avatar
 
Join Date: Apr 2008
Location: Oakley California
Power Supply for Starving Student hybrid?
Quote:
Originally Posted by AndrewT View Post
looks like you need +48Vdc and -19Vdc.
The 19v is across the filament of the tubes, and the filament is being used as a load resistor for the Mosfet source follower consequentially feeding the filament to heat the tube. This is a single supply design.
  Reply With Quote
Old 1st February 2017, 08:52 PM   #6
Ketje is offline Ketje  Belgium
diyAudio Member
 
Ketje's Avatar
 
Join Date: Dec 2012
Location: Flanders
Before you blow-up the LM317,beware.The crossing at the 200Ω is a connection, point is missing !
Mona
  Reply With Quote

Reply


Power Supply for Starving Student hybrid?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
DAC and starving student millet hybrid combined in one Rinna Digital Line Level 6 7th June 2015 09:12 AM
cisco power supply, grounding and the Millett starving student crispchicken Headphone Systems 5 7th February 2014 05:38 PM
cisco power supply, grounding and the Millett starving student crispchicken Headphone Systems 1 18th December 2013 06:18 AM
Millett Hybrid Starving Student (12AU7) vixr Headphone Systems 6 12th October 2013 08:31 AM


New To Site? Need Help?

All times are GMT. The time now is 01:40 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki