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Old 11th Nov 2017, 9:13 pm   #5
chriswood1900
Octode
 
Join Date: Jan 2007
Location: Bristol, UK.
Posts: 1,196
Default Re: Imogen test card generator.

Graham, thanks for the reply, it has cleaned up quite well, I replaced the Tant with a 22uf 25v I had in stock branded RS so should be OK, the diode still tested out OK so I left it in place cleaned up the case which is unmarked externally. I did add a fuse of 250ma slow blow as shown in the picture. The ripple voltage was OK on the wall wart but as always it was 9v 500ma non stabilised so it was nearer 13v with no load so maybe a 16v might be a bit close.
Argus 25 the supply is well designed with bypass caps as well as the electrolytics on both side of the regulator and a protection diode, so I think I was just a bit unlucky with the Tantalum cap.
Regards
Chris
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