X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [209.87.238.133] (HELO intldata.ca) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2145782 for flyrotary@lancaironline.net; Thu, 28 Jun 2007 11:59:37 -0400 Received-SPF: none receiver=logan.com; client-ip=209.87.238.133; envelope-from=jwhaley@intldata.ca Received: from jwhaley ([209.87.238.175]) by intldata.ca (intldata.ca) (MDaemon PRO v9.5.6) with ESMTP id md50000613555.msg for ; Thu, 28 Jun 2007 11:57:28 -0400 From: "Jeff Whaley" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: BAttery Charger was: [FlyRotary] Amazing transformation Date: Thu, 28 Jun 2007 11:57:28 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0037_01C7B97B.80398E00" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 In-Reply-To: Thread-Index: Ace5mNhkx660NcB6Q6KMMBXyuVMt3gAA+CYg X-Spam-Processed: intldata.ca, Thu, 28 Jun 2007 11:57:28 -0400 (not processed: message from valid local sender) X-MDRemoteIP: 209.87.238.175 X-Return-Path: jwhaley@intldata.ca X-Envelope-From: jwhaley@intldata.ca X-MDaemon-Deliver-To: flyrotary@lancaironline.net Reply-To: jwhaley@intldata.ca Message-ID: X-MDAV-Processed: intldata.ca, Thu, 28 Jun 2007 11:57:29 -0400 This is a multi-part message in MIME format. ------=_NextPart_000_0037_01C7B97B.80398E00 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Most PC power supplies require loading on only one voltage rail . usually the +5V, once this rail is stabilized all others fall into line. Jeff Whaley _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Dale Rogers Sent: Thursday, June 28, 2007 11:27 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: BAttery Charger was: [FlyRotary] Amazing transformation Some of the products I used to service a lot utilized the DEC "Q-bus". It's a 12-slot backplane (IIRC) with two power supplies - "left" and "right". Since at least the first two slots are always occupied, the right p/s always has enough load to function. However, since the backplane had to be populated from right to left (no gaps), the left p/s often had no load (to speak of - just backplane signals). Sooooooo, the last slot in the backplane had a "load" pcb inserted - populated with an array of ceramic resistors - to insure that the p/s would function correctly. I would think that a few resistors on a breadboard with appropriate sockets for the unused connectors of a PC p/s would insure stable operation. I have a few left-over power supplies from cases that I can no longer get motherboards for (e.g. baby AT). I'll experiment a bit and report back. Dale R. COZY MkIV #1254 http://members.cox.net/rogersda/Products.html Ernest Christley wrote: I believe this has to do with them being switching mode power-supplies. The way I understand it, the supply has a resonant circuit (something like 10kHz). That is passed through a transformer that is tapped in several places to give the various voltages. Without some load, the resonant circuit won't ring, and you get no power. To much draw and you kill the resonance again. I was using one to do anodizing on aluminum. There was a definite sweet spot that the supply liked to be in. Try to exceed two amps and the output would just drop off instead of increasing. Monty, any idea how much current the derusting draws. I used one of the $3 Harbor Freight multi-meters in series with my anodizing supply. It'll handle 10Amps. If the current draw is low enough (which I suspect it would be if the process takes 24hours), you could use a wall-wart as a supply. __________ NOD32 2361 (20070628) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_0037_01C7B97B.80398E00 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Most PC power supplies require = loading on only one voltage rail … usually the +5V, once this rail is = stabilized all others fall into line.

Jeff = Whaley

 

From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Dale Rogers
Sent: Thursday, June 28, = 2007 11:27 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = BAttery Charger was: [FlyRotary] Amazing transformation

 

  Some = of the products I used to service a lot utilized the DEC "Q-bus".
It's a 12-slot backplane (IIRC) with two power supplies - = "left" and
"right".  Since at least the first two slots are always occupied, the right
p/s always has enough load to function.  However, since the = backplane
had to be populated from right to left (no gaps), the left p/s often had =
no load (to speak of - just backplane signals).  Sooooooo, the last =
slot in the backplane had a "load" pcb inserted - populated = with an
array of ceramic resistors - to insure that the p/s would function
correctly. 

   I would think that a few resistors on a breadboard with appropriate
sockets for the unused connectors of a PC p/s would insure stable
operation.  I have a few left-over power supplies from cases that I = can
no longer get motherboards for (e.g. baby AT).  I'll experiment a = bit
and report back.

Dale R.
COZY MkIV #1254
http://members.cox= .net/rogersda/Products.html


Ernest Christley wrote:

I believe this has to do with them being = switching mode power-supplies.  The way I understand it, the supply has a = resonant circuit (something like 10kHz).  That is passed through a = transformer that is tapped in several places to give the various voltages.  Without = some load, the resonant circuit won't ring, and you get no power.  To = much draw and you kill the resonance again.  I was using one to do anodizing = on aluminum.  There was a definite sweet spot that the supply liked to = be in.  Try to exceed two amps and the output would just drop off = instead of increasing.

Monty, any idea how much current the derusting draws.  I used one = of the $3 Harbor Freight multi-meters in series with my anodizing supply.  = It'll handle 10Amps.  If the current draw is low enough (which I suspect = it would be if the process takes 24hours), you could use a wall-wart as a = supply.




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