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Old 13th August 2011, 11:29 AM   #1
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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.
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Old 13th August 2011, 11:49 AM   #2
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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.
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Old 13th August 2011, 12:35 PM   #3
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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.
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Old 13th August 2011, 01:30 PM   #4
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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.
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Old 13th August 2011, 02:56 PM   #5
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You may want to verify that the output is floating from the input.
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Old 13th August 2011, 02:59 PM   #6
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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.
All just for fun!
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Old 13th August 2011, 03:39 PM   #7
BZed is offline BZed  United States
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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.
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