Universal filament regulator - Page 13 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 20th November 2011, 08:39 AM   #121
tomchr is offline tomchr  United States
diyAudio Member
 
tomchr's Avatar
 
Join Date: Feb 2009
Location: Greater Seattle Area
Work's been hectic... My intension is to have at least the skeleton of a web page of documentation of this filament regulator on my website by tomorrow night.

The boards are due to arrive by Tuesday. I will ship the boards out as soon as they get here. With a little luck, the US buyers who pre-ordered should have boards by the weekend (Monday for sure). International shipping takes longer (typ. two weeks).

The SMD resistors, caps are 0805 size. The inductor is a 0.5-inch square type (I'm using the DR127-series from Coiltronics). The output cap SMD footprint is designed to take any SMD electrolytic cap from 5 mm diameter to 8 mm diameter. The ceramic output caps are 1210's. I'll post more details tomorrow (eh... "later today").

~Tom
__________________
21st Century Maida Regulator, Universal Filament Regulator, Damn Good 300B, Novar Spud, and more...
Neurochrome : : Audio - http://www.neurochrome.com/audio - Engineering : : Done : : Right
  Reply With Quote
Old 21st November 2011, 06:10 AM   #122
tomchr is offline tomchr  United States
diyAudio Member
 
tomchr's Avatar
 
Join Date: Feb 2009
Location: Greater Seattle Area
Success... I've made some progress on the website dedicated to the Universal Filament Regulator.

In addition, I started a "Known Good BOM" spreadsheet (see attached). That should serve as a starting point so you can at least get parts ordered before the boards arrive.
I have also attached the BOM for the 5.0 V, 1.4 A version. This includes Digikey part numbers.
I'm a little behind on documentation as you can see... I'm catching up fast, though.

At this point, I've only looked at the values needed to generate 5.0 V @ 1.5 A for my 300B's. But I expect to have hard data for 6.3 V by the end of the week.

I promised BOMs and such by today. It looks like I just made it in under the wire. The advantages of being in the Pacific time zone... I'll wind down with some music and a cup of tea.

~Tom
Attached Files
File Type: pdf KnownGoodBOM.pdf (20.3 KB, 49 views)
File Type: pdf BOM_5V0.pdf (27.8 KB, 40 views)
__________________
21st Century Maida Regulator, Universal Filament Regulator, Damn Good 300B, Novar Spud, and more...
Neurochrome : : Audio - http://www.neurochrome.com/audio - Engineering : : Done : : Right

Last edited by tomchr; 21st November 2011 at 06:38 AM. Reason: Added BOM
  Reply With Quote
Old 21st November 2011, 08:36 PM   #123
tomchr is offline tomchr  United States
diyAudio Member
 
tomchr's Avatar
 
Join Date: Feb 2009
Location: Greater Seattle Area
Default I can haz boardz

Folks,

The boards arrived a day early. They'll be in the mail today. Thank you to all who pre-ordered.

I assembled one board. With 15 V in, 5.0 V out at 1.55 A the regulator IC barely gets warm. On the top of the IC package, I measure 31 degrees C. I'll post more results as I have them, but for now I'll focus on getting my website updated with design documentation of the filament regulator.

~Tom
Attached Images
File Type: jpg Boards_R3p1.jpg (659.1 KB, 272 views)
__________________
21st Century Maida Regulator, Universal Filament Regulator, Damn Good 300B, Novar Spud, and more...
Neurochrome : : Audio - http://www.neurochrome.com/audio - Engineering : : Done : : Right
  Reply With Quote
Old 22nd November 2011, 03:19 AM   #124
diyAudio Member
 
SpreadSpectrum's Avatar
 
Join Date: Nov 2007
Tom,

Thanks for the BOMs. After I get the parts in hand I may have more questions on how to solder the regulator to the board. I haven't done anything like that one yet. The rest should be cake, though.
  Reply With Quote
Old 22nd November 2011, 10:25 PM   #125
tomchr is offline tomchr  United States
diyAudio Member
 
tomchr's Avatar
 
Join Date: Feb 2009
Location: Greater Seattle Area
Soldering the IC is actually pretty easy once you know The Trick™

The Trick is to arm yourself with a good soldering iron with a big tip (big thermal mass). I use a 6.3 mm wide chisel tip on my Metcal. Then cover the thermal pad on the board with solder. Use enough to plug the thermal vias and leave a light coat on both the top and bottom side of the board. Then lightly coat the DAP on the IC with solder. "Lightly" is key here. Use enough to cover the DAP but not so much that it forms a bump. Apply flux to the thermal pad on the board and the DAP. Place the IC on the board and heat up the thermal pad from the bottom. Once the flux has boiled off you should watch the solder melt and the IC center itself on the footprint thanks to the surface tension of the solder. Once that happens, remove the soldering iron and let the board cool down.

You can also use a heat gun with a small diameter nozzle, but I find the heat to be easier to control with a soldering iron.

~Tom
__________________
21st Century Maida Regulator, Universal Filament Regulator, Damn Good 300B, Novar Spud, and more...
Neurochrome : : Audio - http://www.neurochrome.com/audio - Engineering : : Done : : Right
  Reply With Quote
Old 23rd November 2011, 01:26 AM   #126
tomchr is offline tomchr  United States
diyAudio Member
 
tomchr's Avatar
 
Join Date: Feb 2009
Location: Greater Seattle Area
For pictures of the assembly process, have a look at the Universal Filament Regulator Website.

~Tom
__________________
21st Century Maida Regulator, Universal Filament Regulator, Damn Good 300B, Novar Spud, and more...
Neurochrome : : Audio - http://www.neurochrome.com/audio - Engineering : : Done : : Right
  Reply With Quote
Old 23rd November 2011, 01:42 AM   #127
TheGimp is offline TheGimp  United States
diyAudio Member
 
TheGimp's Avatar
 
Join Date: Aug 2009
Location: Johnson City, TN
SMDs such as resistors are easily soldered by placing a small bump of solder on one pad. Hold the resistor with tweezers, heat the solder bump and when it is liquid place the resistor in place. The solder will wick to it due to the heat transfer from the thermal mass of the pad and iron. As soon as the solder wicks remove the iron. Then solder the other pad.
  Reply With Quote
Old 23rd November 2011, 02:52 AM   #128
tomchr is offline tomchr  United States
diyAudio Member
 
tomchr's Avatar
 
Join Date: Feb 2009
Location: Greater Seattle Area
Quote:
Originally Posted by TheGimp View Post
SMDs such as resistors are easily soldered by placing a small bump of solder on one pad. Hold the resistor with tweezers, heat the solder bump and when it is liquid place the resistor in place. The solder will wick to it due to the heat transfer from the thermal mass of the pad and iron. As soon as the solder wicks remove the iron. Then solder the other pad.
That's my trick as well. Works every time. I will sometimes go back and clean up the first solder joint once the component is on the board.

~Tom
__________________
21st Century Maida Regulator, Universal Filament Regulator, Damn Good 300B, Novar Spud, and more...
Neurochrome : : Audio - http://www.neurochrome.com/audio - Engineering : : Done : : Right
  Reply With Quote
Old 23rd November 2011, 11:15 PM   #129
diyAudio Member
 
SpreadSpectrum's Avatar
 
Join Date: Nov 2007
I spread flux on the pads, let it become tacky, place the resistor, melt a small amount of solder on the iron tip, and touch the tip to the pad and the solder flows right in. Obviously, you have to pin the resistor with something or it will be pulled towards the iron tip. I can do a lot of resistors quite quickly this way.

The DAP will be new to me. I'm looking forward to learning something new with this.

By the way, I got my boards today. If only my digi-key order were anywhere close to me right now...
  Reply With Quote
Old 24th November 2011, 01:24 AM   #130
diyAudio Member
 
Join Date: Apr 2003
Location: Southern Tier NY
Boards are in as well. Look forward to populating over the next few weeks.
__________________
Living Life Doing the Waltz in 4/4 meter.
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Universal Tiger aged one Solid State 232 5th December 2012 10:09 PM
Noisy IC Universal Regulator dwalker0044 Power Supplies 4 14th April 2011 02:26 PM
Parallel vs. series filament supply - or another filament idea engels Tubes / Valves 11 13th May 2007 01:06 PM


New To Site? Need Help?

All times are GMT. The time now is 11:40 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2