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G6Tanuki · 14th Nov 2020, 7:48 pm

Most of the 'classic' 1940s/1950s designs for such PSUs will assume you'll be working with a valve-rectifier and old-style low-value [less-than-50uF] electrolytic capacitors, both of which also suggest involving a choke.

While that was the path-to-success in the 1950s, these days we have silicon diodes and high-voltage-high-capacitance electrolytic-capacitors are everywhere.

For the HT I'd suggest looking at something like what's called a "1:1 panel transformer" - used in loads of industrial applications, so are cheap. Then bridge-rectify the secondary using modern [UF4007] silicon diodes and smooth with 1000uF or so of cheap 450V-rated electrolytics. This will provide a 'low-source-impedance' DC supply that won't wander up or down too much as your radio's consumption varies.

14th Nov 2020, 7:48 pm	#53
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,005	Re: R1155 Modern Power Supply Most of the 'classic' 1940s/1950s designs for such PSUs will assume you'll be working with a valve-rectifier and old-style low-value [less-than-50uF] electrolytic capacitors, both of which also suggest involving a choke. While that was the path-to-success in the 1950s, these days we have silicon diodes and high-voltage-high-capacitance electrolytic-capacitors are everywhere. For the HT I'd suggest looking at something like what's called a "1:1 panel transformer" - used in loads of industrial applications, so are cheap. Then bridge-rectify the secondary using modern [UF4007] silicon diodes and smooth with 1000uF or so of cheap 450V-rated electrolytics. This will provide a 'low-source-impedance' DC supply that won't wander up or down too much as your radio's consumption varies.