After reflecting on your point, that is obviously true, Tom, I would go ahead and spend a few cents on some rectifiers to put across those electrolytics!
Operating electrolytics in series is just something I don't do -except in a voltage-doubler or a Cockroft-Walton multiplier. Have a Merry Christmas! Charlie, K4OTV -----Original Message----- From: Topband [mailto:[email protected]] On Behalf Of Charlie Cunningham Sent: Saturday, December 21, 2013 1:32 PM To: 'Tom W8JI'; 'Bill Cromwell'; 'top Band' Subject: Re: Topband: DX-100 adventure - progress Diodes across the electrolytics ro prevent reverse chargin would probably be a good idea. 1N4007 1000 PIV, 1 A rectifiers should do nicely. -----Original Message----- From: Topband [mailto:[email protected]] On Behalf Of Tom W8JI Sent: Saturday, December 21, 2013 1:02 PM To: Charlie Cunningham; 'Bill Cromwell'; 'top Band' Subject: Re: Topband: DX-100 adventure - progress > BTW, Biii - tip/suggestion - for those series-connected electrolytics > you probably should put a pair of equal value resistors - one across > each series capacitor, as the leakage currents will not be equal in > each capacitor in each series string and the DC voltage won't divide > equally across each capacitor unless you put individual "bleeder" or > "swamping" resistors across each cap in the series pair to equalize > the DC across each capacitor in the series! It is worse than that. With a single bleeder for two series capacitors, the capacitor with the least capacitance will always be reversed charged upon every power down. So even you have equal voltages by equal leakages, you have to add a parallel diode or the discharge will reverse charge the cap with the lowest capacitance value. _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband
