UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

kellys_eye · 21st Jun 2018, 12:08 pm

The link to Horowitz is very useful - thanks MrB.

As already inferred in posts above, my sources for parts are the usual ex-PC and UPS devices so the TL494, SG3524/3854 etc are bountiful at the moment!

I dug up an old magazine that described an SMPS intended for in-car use, driving a high power audio amplifier setup. 12V input, +/- 35V output at around 200W which, with a modification to the secondary winding, may be a suitable starting point?

Is there a rule of thumb to determine maximum power in the transformer core? Some so-called 350W PC power supplies have transformers that are less than half the size of transformers found in 200W supplies.... I dread to think I'll have to test the core for saturation/frequency etc.

21st Jun 2018, 12:08 pm	#6
kellys_eye Octode Join Date: Jan 2014 Location: Oban, Scotland, UK. Posts: 1,129	Re: Switched Mode Power Supplies The link to Horowitz is very useful - thanks MrB. As already inferred in posts above, my sources for parts are the usual ex-PC and UPS devices so the TL494, SG3524/3854 etc are bountiful at the moment! I dug up an old magazine that described an SMPS intended for in-car use, driving a high power audio amplifier setup. 12V input, +/- 35V output at around 200W which, with a modification to the secondary winding, may be a suitable starting point? Is there a rule of thumb to determine maximum power in the transformer core? Some so-called 350W PC power supplies have transformers that are less than half the size of transformers found in 200W supplies.... I dread to think I'll have to test the core for saturation/frequency etc.