Aristotle wrote:
I like your username. Is this the same Hypatia depicted in the movie 'Agora' ...
Actually no, my user name makes reference to Hypatia of Alexandria (the prodigious philosopher and mathematician) a great benefactor...
Many thanks for your interest! :-) Best regards DanPS -- RE: the overheating diode string -- FWIW, upon reflection it seems probable that, prior to implementation of line-isolation, the 'short' was occurring via the O'scope ground (inasmuch as most line operated test equipment returns signal ground to 'mains ground' and hence neutral)...
----- Original Message ----- From: "Aristotle" <Aristotle@xxxxxxxxxxxx>
To: <hypatia@xxxxxxxxxxxxxxxxxxx> Sent: Friday, August 29, 2014 6:56 PM Subject: Re: [TCML] overheating diode strings
I like your username. Is this the same Hypatia depicted in the movie 'Agora' which came out about 4 - years ago. Another fascinating Greek figure is Aristotle which you probably already know. :)On 8/29/2014 2:50 AM, Hypatia's Protégé wrote:Indeed your difficulty would appear issue of a 'ground-fault' -- With the aim of confirming/eliminating this possibility, please consider exciting the bridge from a line-isolated feed. Moreover employment of a current-limiting resistor (while troubleshooting) would be advisable.Note also that proper operation requires an exciting EMF sufficient to properly bias the string (howbeit this consideration has no bearing upon overheating)Good luck & best regards Dan ----- Original Message ----- From: "dave pierson" <dave_p@xxxxxxxxxxx> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> Sent: Thursday, August 28, 2014 7:53 PM Subject: Re: [TCML] overheating diode stringsThere is a gotcha with bridge rectifiers, it bit me yaars ago. Borrowing the sketch below: WHERE, if anywhere, are the 'grounds'? ----- Original Message ---Your schematic should look something like the following, with a whole lot more diodes: (AC Input) | |--|>|--|>|--|>|--|--|>|--|>|--|>|--| | | | (-) | (+) | | |--|>|--|>|--|>|--|--|>|--|>|--|>|--| | | | (Negative) (AC Input) (Positive) (output) (Output) I'd guess you have one leg of the bridge turned around.As i understand the test rig, the low/common side of the variac is at 'ground'. IF (note the IF....) the negative output is 'grounded' one string is trying to short the variac wiper to 'ground', half the time. This would not be an issue in the real application, unless the secondary is 'grounded'. best dwp _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla--Fix reason firmly in her seat, and call to her tribunal every fact, every opinion. Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blindfolded fear.Thomas Jefferson
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