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Old 18th Apr 2020, 1:10 pm   #1
vinrads
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Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 3,737
Default Home built power supply on the cheap.

I have had it in mind for some time to build a power supply for an early Columbia radiogram. It needed two volts DC, 2x grid bias, and HT which ended up at 145 volts.
All the main parts were from my junk boxes, the case was a screening can off something! the chassis is a piece of thin aluminium screwed to a piece of ply, this makes assembly easy.
The heater and bias tx was a 14v with centre tap, I was able to separate the two wires on the centre tap giving me two separate 7 volts. The rectifiers are a bit ott, but there were two on the panel and smoothing caps, just the job.
Two 10k presets were wired across the bias supply, giving me 0 to 9 volt adjustable. I think the larger of the two TX's was from a scrap Fergi t/v.
The radio chassis was repaired some time ago. Mick.
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Old 19th Apr 2020, 9:09 am   #2
Kevin Hoyland
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Join Date: Feb 2009
Location: Rotherham, South Yorkshire, UK.
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Default Re: Home built power supply on the cheap.

Morning Mick.
As always mick first class workmanship it's a long time since I was in your workshop and looking at your collection of valve/tube radios lots of them from the US.
Keep the good work up.
Kev.

Ps do you still have your collection of Catalin radios.
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Old 19th Apr 2020, 9:42 am   #3
vinrads
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Default Re: Home built power supply on the cheap.

Good morning Kev thank's for the kind comments, I still have the Catalin ones plus a few more small transistor radio's about fifty plus , It seems to be a good day to look for the dial I had made for the Columbia ,now where did I see it last , Keep safe. Mick.
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Old 19th Apr 2020, 8:26 pm   #4
Ed_Dinning
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Default Re: Home built power supply on the cheap.

Hi Mick, nice re purposing. A good source of the transformers was older video recorders that used non SMPS devices with at least 5 different secondaries

Ed
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