Electronic transformer filament supply

[quikie22]

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]

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]

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]

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]

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

 

[DualTriode]

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]

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.