Electronic transformer filament supply

quikie22 · 13th August 2011, 11:29 AM

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.

woody · 13th August 2011, 11:49 AM

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.

quikie22 · 13th August 2011, 12:35 PM

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.

mississippi · 13th August 2011, 01:30 PM

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.

astouffer · 13th August 2011, 02:56 PM

You may want to verify that the output is floating from the input.

DualTriode · 13th August 2011, 02:59 PM

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!

BZed · 13th August 2011, 03:39 PM

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.

13th August 2011, 11:29 AM	#1
quikie22 diyAudio Member Join Date: Sep 2009	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.

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13th August 2011, 11:49 AM	#2
woody 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.

13th August 2011, 12:35 PM	#3
quikie22 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.

13th August 2011, 01:30 PM	#4
mississippi diyAudio Member 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.

13th August 2011, 02:56 PM	#5
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	You may want to verify that the output is floating from the input.

13th August 2011, 02:59 PM	#6
DualTriode 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!

13th August 2011, 03:39 PM	#7
BZed 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.