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#16
October 29th 08, 12:39 AM
posted to rec.radio.amateur.homebrew
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I built a 7.5VAC 21Amp transformer now it has lots of buzz
I left out switch based hot swappable
"Henry Kolesnik" wrote in message ... Hey Grump A transformer is one of the simplest electrical machines and pretty well understood in the classical design but when some of the parameters are changed we don't have much experience or investigation and probably wont. Hot swappable rectifier modules have made transformer based rectifiers uneconomical kinda like carburetors and fuel injection. If you have the time, check with some of the old time designers of transformer rectifiers. Let me now what you find out. I had some notes but those are long gone. Hank "Grumpy The Mule" wrote in message ... Howdy Hank, Thanks for the follow-up! Perhaps they used a voltage regulating transformer. I think some of the telcom rectifiers used them. I know some mainframe computers did. It's still a curiosity to me. Though I've seen enough occult behavior from wound magnetic devices that I wouldn't discount it, I'm tempted to wonder if there's another variable that was coincident with the welded laminations. 73 "Henry Kolesnik" wrote in : Grumpy Years ago in 93 or so on a Telco fiber system by Alcatel we took severe hits when the air conditioner came on and it was traced to the station rectifier. The Gould rectifiers had a weld bead and when we replaced them another make which I can't recall that didn't have weld beads the problem went away. Its quite strange since the rectifiers floated big batteries but a vco in system was sensitive to the spike. After doing some research I found an explanation that I can't recall because I was too busy with other problems and mine had gone away. Alcatel spent several hundred thousand trying to find the problem and I stumbled on to it by shear luck. 73 Hank WD5JFR |
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