Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!cbmvax!grr
From: grr@cbmvax.commodore.com (George Robbins)
Newsgroups: sci.electronics
Subject: Re: ESR of copper oxide rectifiers
Message-ID: <8974@cbmvax.commodore.com>
Date: 13 Dec 89 08:56:00 GMT
References: <1989Dec12.022128.3128@tapa.uucp> <3103@tymix.UUCP>
Reply-To: grr@cbmvax.commodore.com (George Robbins)
Organization: Commodore, West Chester, PA
Lines: 27

In article <3103@tymix.UUCP> stimac@tymnet.com (Michael Stimac) writes:
> In article <1989Dec12.022128.3128@tapa.uucp> larry@tapa.uucp (Larry Pajakowski) writes:
> >In refurbishing my old Lionel train transformer I replaced a copper oxide
> >rectifier of about 1in. diameter with a silicon diode.  In the original
> >circuit a compensation winding of 5 volts was switched in series with the
> >copper oxide diode to keep the output from sagging too much.  I'm trying
> 
> Are you getting unsatisfactory results changing only the diode,
> without the extra resistor? (ie, does the train speed up when you
> sound the whistle?) Since the transformers were not well-regulated,
> the output would drop when the whistle motor kicked in (nearly
> doubling the load); I think the extra five volts is to compensate
> for this poor regulation more than for the resistance of the
> copper oxide diode. 

Gee, I seem to recall the sped up a but when you did the whistle anyway -
added to the excitement and all.

Is the rectifier a simple half-wave job?  If so the winding would probably
be to compensate for the lower RMS voltage of the half-wave rectifed current.
Is is really copper-oxide and not selenium?  Shouldn't be too hard to dig up
some voltage drop stuff for selenium recitifers/stacks...

-- 
George Robbins - now working for,	uucp: {uunet|pyramid|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@uunet.uu.net
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)