Question on rectifying heater supply from AC to DC

[Chris Hornbeck]

Thanks for the heads up. Just what I've been looking for.


All good fortune,
Chris

 

[Paul Joppa]

If you use big Schottky diodes, there will be plenty of voltage.

 

[jean-paul]

MIC5156 family of Mosfet LDO controllers should enable someone to build a practical 6.3VAC to 6.3VDC converter. But the bottleneck is the required auxiliary voltage.

Bellow the schematic of a board I have in the mail from JLC that should give 6.3VAC to DC at 2A from a high current winding.

The MIC5157 has an internal charge pump and then that is solved.

 

[v4lve lover]

If you use big Schottky diodes, there will be plenty of voltage.

SB520 comes to mind, but there are better ones in TO220 package, its just that DO201 is cheap and plentyfull in choice.

 

[lcsaszar]

@DIYish: what is the input sensitivity or total gain of your tube amplifier? And what is the total current draw of the heaters?
Normally you need DC heating if the input sensitivity is in the mV range. At 100mV and above it is not necessary in my experience.
If you really need it, for DC heating you need a 8VAC transformer secondary (again my experience).