12-02-2014, 11:46 AM
(This post was last modified: 12-02-2014, 11:52 AM by Old Sparky.)
I haven't made a capacitive dropper for that, or any UK AC/DC radio, but I did make one recently for a Canadian Mitchell radio, to allow that to be run from 230/240v. I used four class 'X' capacitors in parallel, totalling 4.47uf, which dropped the voltage to 112vac at the rectifier input. There is an article on the UKVRRRDF which goes into the rather complex maths. needed to work out the values required for capacitive droppers, and also explains the merits/demerits of several types of dropper. It's not in the forum as such, but in one of the sections on 'how to do' various things, so a search of the VRRRDF site will surely find it! N.B. The article in question is referred to by Geaney, and shown in the You Tube clips in post #3 above.
