Electronic transformer filament supply - 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 13th August 2011, 11:29 AM   #1
diyAudio Member
 
Join Date: Sep 2009
Default Electronic transformer filament supply

I am planning to use an 12V electronic transformer for halogen lamps for my filament supply for a guitar amplifier. Assuming I want to convert this to DC first, can I use bog standard 1N400X series diodes in bridge mode followed by an LC to rectify it? Any thoughts/answers would be highly appreciated.
  Reply With Quote
Old 13th August 2011, 11:49 AM   #2
diyAudio Member
 
Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
For a quitar amp. I doubt you will notice any difference if you just stick with using
ac for your filaments. If you did go with a dc supply you would probably need to use
diodes with much higher current ratings. And a LC filter will probably give you closer
to 10V instead of the 12.6 you need.
  Reply With Quote
Old 13th August 2011, 12:35 PM   #3
diyAudio Member
 
Join Date: Sep 2009
Hi Woody,

Thanks for the reply.

This is an "electronic transformer"

OSRAM|Professionals|ECG|Electronic transformers for low-voltage halogen lamps|HTN S|index

These are not the run of the mill transformers. They actually operate at a frequency around 12khz to 20khz...I was wondering if I could get away with using normal diodes instead of high speed ones.
  Reply With Quote
Old 13th August 2011, 01:30 PM   #4
diyAudio Member
 
mississippi's Avatar
 
Join Date: Apr 2006
Location: holland
You need high speed diodes, normal ones, dont "close" because of the high frequency, they remain open, and the diodes will be short circuit your transformer.
  Reply With Quote
Old 13th August 2011, 02:56 PM   #5
diyAudio Member
 
astouffer's Avatar
 
Join Date: Jun 2004
Location: Pittsburgh, crumbling wasteland
You may want to verify that the output is floating from the input.
  Reply With Quote
Old 13th August 2011, 02:59 PM   #6
diyAudio Member
 
Join Date: Aug 2009
Location: Sacramento
Hello,
If you have the transformer in your hand try it. Current through a FWB rectifier looks more like pulses than waves, I am +1 with the idea of bigger and faster diodes. If you do not plan on a voltage regulator a CRC filter works well for heaters. You will need to adjust the resistor between the capacitors to dial in the output voltage.
DT
All just for fun!
  Reply With Quote
Old 13th August 2011, 03:39 PM   #7
BZed is offline BZed  United States
diyAudio Member
 
Join Date: Jun 2009
If you have one of those in hand I would take a good look at the output waveform. Its an AC to AC switcher. Talk about a hash noise generator. I'd go with a normal transformer inspite of the size/weight.
  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
Filament Transformer dejanm Tubes / Valves 11 26th December 2013 02:21 AM
Airgap for filament transformer ? Lauscher Tubes / Valves 11 29th April 2009 05:41 PM
Parallel vs. series filament supply - or another filament idea engels Tubes / Valves 11 13th May 2007 01:06 PM
Filament Transformer cantskienuf Tubes / Valves 1 24th June 2005 01:41 AM
filament transformer vs plate transformer contaxchen Tubes / Valves 10 14th January 2005 10:43 AM


New To Site? Need Help?

All times are GMT. The time now is 07:39 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