DIYAPASON-L Digest #688 - Tuesday, November 19, 2002
 
CAD
  by "Nemesio Valle, III" <captainnemo@directvinternet.com>
Re: DIYAPASON-L Digest #687 - 11/18/02
  by "Terry Gibson" <terryg55@nexicom.net>
Re: [Residence Organs]  RE: rectifier output voltage
  by "Kelvin Smith" <KelvinSmith@UntraveledRoad.com>
 

(back) Subject: CAD From: "Nemesio Valle, III" <captainnemo@directvinternet.com> Date: Tue, 19 Nov 2002 14:39:17 -0500   Dear List, I have heard about a program for printing out toeboards and other aspects of chest design. Could someone with experience please elaborate on this program (cost, functionality, etc.)? I thank you and am, Respectfully yours, Nemesio -- Nemesio Valle, III M.A., Historical Musicology, University of Pittsburgh M.M., Sacred Music, Duquesne University   Address: 5802 Callowhill Street Pittsburgh, PA 15206 Phone: 412-365-0340   Email: captainnemo@directvinternet.com   The purpose of art is not the release of a momentary ejection of adrenaline but is, rather, the gradual, lifelong construction of a state of wonder and serenity. Glenn Gould   I have never met a man so ignorant that I couldn't learn something from = him. Galileo Galilei   I have always imagined that paradise will be a kind of library. Jorge Luis Borges   Specialization is for insects. Lazarus Long   Competitions are for horses, not artists. Bela Bartok   Understanding is both the first principle and the source of good sound = writing. Horace  
(back) Subject: Re: DIYAPASON-L Digest #687 - 11/18/02 From: "Terry Gibson" <terryg55@nexicom.net> Date: Tue, 19 Nov 2002 19:59:01 -0500   Steve, There is a simple solution to your problem. I have built many power = supplies including the one I use on my own organ. Whats happening is the capacitor is = charging to the peak voltage it sees when there is no load on it. A 12 volt supply means 12volts RMS, however the peak voltage is actually a little over 16 volts. The solution is to add a wirewound resistor across the capacitor, I = suggest approx 10ohms and rated at about 20watts. This should drop your peak voltage back into = the 12-13 volt range. Hope this helps....   Terry Gibson   ----- Original Message ----- From: "Residence Organ List" <DIYAPASON-L@pipechat.org> To: "Residence Organ List" <DIYAPASON-L@pipechat.org> Sent: Tuesday, November 19, 2002 12:30 AM Subject: DIYAPASON-L Digest #687 - 11/18/02     > DIYAPASON-L Digest #687 - Monday, November 18, 2002 > > RE: rectifier output voltage > by "STEVE PITTS" <steve.pitts@adtran.com> > RE: [Residence Organs] RE: rectifier output voltage > by "ATOS" <atos@stirlingprop.com> > > > ---------------------------------------------------------------------- > > Subject: RE: rectifier output voltage > From: "STEVE PITTS" <steve.pitts@adtran.com> > Date: Mon, 18 Nov 2002 11:25:02 -0600 > > > > I have a Elgin organ power supply connected to my Schlicker console. I have noticed that the coils of energized gang-switches are getting quite warm. I checked the output of the power supply and found 16 volts. I was expecting 12 volts.I don't know the make of the gang switches, but I am guessing > they generally have similar voltage ratings. This is not a regulated supply, IOW it just has a transformer, rectifier diodes and a filter capacitor. Is 16 volts too much? > > > Steve Pitts > Ardmore Tennessee > > ---------------------------------------------------------------------- > > Subject: RE: [Residence Organs] RE: rectifier output voltage > From: "ATOS" <atos@stirlingprop.com> > Date: Mon, 18 Nov 2002 15:35:20 -0600 > > Steve, > 16 volts could possibly be a little high. Does your power transformer = have > taps on the primary? With my OrgElectra, there are several different = taps so > I can adjust the voltage by moving one of the incoming hot leads to > different terminal screws. The input voltage here usually runs about 232 > volts and I have to set mine down on the lowest tap to maintain the = output > at around 13.5 volts. Remember too that the voltage lowers as the organ > loads the transformer down when you are playing. I have heard that = direct > electric valves require higher voltages in some case, but I am running 13.5 > volts on a 10 rank Wurlitzer and everything seems to be happy. > > You might also check the condition of the capacitors because if there is an > AC component in the DC voltage because of filter capacitors failing, = that > could heat up your DC coils. > > -----Original Message----- > From: DIYAPASON-L@pipechat.org [mailto:DIYAPASON-L@pipechat.org]On > Behalf Of STEVE PITTS > Sent: Monday, November 18, 2002 11:25 AM > To: 'Residence Organ List' > Subject: [Residence Organs] RE: rectifier output voltage > > > > > I have a Elgin organ power supply connected to my Schlicker console. I have > noticed that the coils of energized gang-switches are getting quite = warm. I > checked the output of the power supply and found 16 volts. I was expecting > 12 volts.I don't know the make of the gang switches, but I am guessing > they generally have similar voltage ratings. This is not a regulated supply, > IOW it just has a transformer, rectifier diodes and a filter capacitor. = Is > 16 volts too much? > > > Steve Pitts > Ardmore Tennessee > > DIYAPASON-L: a Discussion list for owners and builders of their own > Residence Pipe Organs. > HOMEPAGE : http://www.diyapason.pipechat.org > List: mailto:DIYAPASON-L@pipechat.org > Administration: mailto:owner-DIYAPASON@pipechat.org > > > > ---------------------------------------------------------------------- > End of DIYAPASON-L Digest > > DIYAPASON-L: a Discussion list for owners and builders of their own Residence Pipe Organs. > HOMEPAGE : http://www.diyapason.pipechat.org > List: mailto:DIYAPASON-L@pipechat.org > Administration: mailto:owner-DIYAPASON@pipechat.org > >    
(back) Subject: Re: [Residence Organs] RE: rectifier output voltage From: "Kelvin Smith" <KelvinSmith@UntraveledRoad.com> Date: Mon, 18 Nov 2002 10:35:19 -0700   I remember my rectifier reading similarly when I first plugged it in. I didn't worry about it and it has worked fine for years. I kind of assumed that the voltage was dropping when it was under a load, but I don't know = if that's true.   Kelvin   >I have a Elgin organ power supply connected to my Schlicker console. I >have noticed that the coils of energized gang-switches are getting quite >warm. I checked the output of the power supply and found 16 volts. I was >expecting 12 volts.I don't know the make of the gang switches, but I am >guessing >they generally have similar voltage ratings. This is not a regulated >supply, IOW it just has a transformer, rectifier diodes and a filter >capacitor. Is 16 volts too much? > > >Steve Pitts >Ardmore Tennessee > >DIYAPASON-L: a Discussion list for owners and builders of their own >Residence Pipe Organs. >HOMEPAGE : http://www.diyapason.pipechat.org >List: mailto:DIYAPASON-L@pipechat.org >Administration: mailto:owner-DIYAPASON@pipechat.org