---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 03/16/08: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:53 AM - Re: Ground Start enunciator light (Carlos Trigo) 2. 05:22 AM - Electrical question () 3. 07:00 AM - Van's Ammeter Question (rampil) 4. 07:05 PM - Ground Start enunciator light (Addendum) (Robert L. Nuckolls, III) 5. 07:05 PM - DPDT high-current contactor needed (Jim McBurney) 6. 07:22 PM - Audio iso amp ordered, never received (nauga@brick.net) 7. 07:49 PM - Re: Ground Start enunciator light (Addendum) (William Slaughter) 8. 09:49 PM - Re: Audio iso amp ordered, never received (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 03:53:11 AM PST US From: "Carlos Trigo" Subject: RE: AeroElectric-List: Ground Start enunciator light Bob Thanks for pointing me to this schematic. I have 2 questions about this schematic: - shouldn't the "Ground Power" contactor p/n be S701-1 instead of S702-1? - regarding the lamp, if I want to put a simple 2 terminal lamp, instead of a ptt lamp, is the wiring the same? Carlos > -----Original Message----- > From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list- > server@matronics.com] On Behalf Of Robert L. Nuckolls, III > Sent: domingo, 16 de Mar=E7o de 2008 3:08 > To: aeroelectric-list@matronics.com > Subject: Re: AeroElectric-List: Ground Start enunciator light > > > > At 01:53 AM 3/16/2008 +0000, you wrote: > > > > > > >Listers > > > >I installed a Piper-type male socket to my airplane, to have the possibility > >of a ground start in case of a low battery cranking difficulty. > >As recommended by this List experts, I connected the socket to the battery > >through a continuous duty contactor (aka Master Relay or Battery solenoid), > >the S701-1 from B&C, controlled by a SPST switch, which grounds the > >contactor when thrown to ON. > > > >Now what I want to do is to put a green enunciator light in my panel, which > >illuminates when that switch is ON and the contactor is closed to allow the > >ground start procedure, to remind me to switch it Off after finishing that > >procedure. > > > >I have tried some wiring of the warning light to the switch, but I cannot > >make it work properly. Can somebody please enlighten me how to wire it? > > The schematic is shown at: > > http://www.aeroelectric.com/articles/grndpwr.pdf > > > > Bob . . . > > ----------------------------------------) > ( . . . a long habit of not thinking ) > ( a thing wrong, gives it a superficial ) > ( appearance of being right . . . ) > ( ) > ( -Thomas Paine 1776- ) > ---------------------------------------- > > > > > > > > > ________________________________ Message 2 _____________________________________ Time: 05:22:27 AM PST US From: Subject: AeroElectric-List: Electrical question 3/12/2008 Hello Tom, You wrote: 1) "For clarification, the NC switch means that I press the button to actually cut the power. Why would this be used on an old military helicopter stick? What is the reason for cutting the power on a switch?" We used to say that having helicopter time in your pilot's logbook was like having an STD entry (it was called venereal disease back then) in your health record. So I will reluctantly admit that I did fly a helicopter (CH-46) for a year in Viet Nam. The cyclic grip had a button on it that when pressed would disconnect the electronic flight stability / attitude positioning system so that one could manually reposition the stick and the helicopter's attitude then releasing the button would reengage the electronic attitude positioning system. Maybe you have a control stick grip that does something similar. 2) "Again, is there any way I can wire it to work with my remote ident operation?" I am not the right guy to answer that question, but I am sure that by using two of the small "ice cube" type relays that ident operation could be accomplished. It might be a pretty awkward way of doing it though from an electrical viewpoint. I'll forward your question to the Matronic's aeroelectric-list and maybe one of the electrical experts there (even the great guru Bob Nuckolls) would take a shot at it. 'OC' Says: "The best investment we can make is the effort to gather and understand knowledge." -------------------------------------------------------- ----- Original Message ----- From: "Tom Gibbons" Sent: Wednesday, March 12, 2008 12:25 AM Subject: Electrical question On my military surplus control stick I have 4 push buttons, 2 wired normally opened (NO) and 2 wired normally closed (NC). I really do not have access to these switches so I have to make due but can I use the NC switches somehow? I have plans for comm flip/flop, nav flip/flop, and Ident for my transponder. I actually have a "hattie" switch in the middle for trim which is not hooked up. The stick is installed with the ptt and intercom trigger switches working good. All kinds of switches on this guy. Was not going to use it but hey, it felt so comfortable, why not. For clarification, the NC switch means that I press the button to actually cut the power. Why would this be used on an old military helicopter stick? What is the reason for cutting the power on a switch? Again, is there any way I can wire it to work with my remote ident operation? Tom ________________________________ Message 3 _____________________________________ Time: 07:00:40 AM PST US Subject: AeroElectric-List: Van's Ammeter Question From: "rampil" Anyone know why Van's Ammeter gauge requires a +12V source (independent of lighting)? My hangar neighbor is building a -7 and noticed that when he keys his ICOM his ammeter goes to 20-30 Amps on some frequencies but only 2-3 Amps on others. Externally, the ammeter looks like a standard analog mechanical gauge using an external shunt and with no technical docs provided by Vans. My buddy also has RFI on his trim servo indicator (apparently quite common) and on his Van's Manifold Pressure gauge. Shielded cable apparently does the trick for the servo, but I'd like to understand the Ammeter a bit better before throwing bypass caps and ferrites at it. Thanks! -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=170155#170155 ________________________________ Message 4 _____________________________________ Time: 07:05:09 PM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Ground Start enunciator light (Addendum) At 01:53 AM 3/16/2008 +0000, you wrote: > > >Listers > >I installed a Piper-type male socket to my airplane, to have the possibility >of a ground start in case of a low battery cranking difficulty. >As recommended by this List experts, I connected the socket to the battery >through a continuous duty contactor (aka Master Relay or Battery solenoid), >the S701-1 from B&C, controlled by a SPST switch, which grounds the >contactor when thrown to ON. > >Now what I want to do is to put a green enunciator light in my panel, which >illuminates when that switch is ON and the contactor is closed to allow the >ground start procedure, to remind me to switch it Off after finishing that >procedure. > >I have tried some wiring of the warning light to the switch, but I cannot >make it work properly. Can somebody please enlighten me how to wire it? Carlos, A couple of hours after I replied to this it occurred to me that you probably were not incorporating a press-to-test light fixture nor did you mention crowbar ov protection. I've updated the schematics in the article to include "Ground Power Lite" without OV protection and using a plain vanilla lamp fixture. See the last page of: http://www.aeroelectric.com/articles/grndpwr.pdf Is this more like what you needed? Bob . . . ----------------------------------------) ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ---------------------------------------- ________________________________ Message 5 _____________________________________ Time: 07:05:45 PM PST US From: "Jim McBurney" Subject: AeroElectric-List: DPDT high-current contactor needed Hi, Listers, I need a manually operated double pole double throw contactor that will carry (not make or break) up to 400 amps. I'm building a 14v system, but my engine requires 24v to spin the starter. My plan is to install 2 batteries. Normal configuration will be parallel for charging and normal running, but switching one battery into a series configuration for starting. Actual starting will be with a starter contactor, so the dpdt contactor won't make or break the starting current. Any thoughts on where I could find such a contactor? Blue skies and tailwinds Jim CH-801 DeltaHawk diesel Augusta GA 90% done, 90% left ________________________________ Message 6 _____________________________________ Time: 07:22:04 PM PST US From: "nauga@brick.net" Subject: AeroElectric-List: Audio iso amp ordered, never received First, to all, Bob Nuckolls included, I apologize for bringing this up here, but I don't see any alternative. Bob, I ordered an audio isolation amp board from you in December and paid using Paypal. You said you were planning on updating the board but would pull one and send it to me. I've sent messages through the message area, e-mails using the address in your responses to my questions before ordering, and a request for info on the Aeroelectric list. I've gotten no response or recognition that you've received any of my attempts at communication. So: Can you let me know what's going on with my order? I wouldn't mind the wait if I knew something was happening at your end but that just hasn't been the case. Please respond here or contact me by e-mail. You have my address. Dave Hyde ________________________________ Message 7 _____________________________________ Time: 07:49:32 PM PST US From: "William Slaughter" Subject: RE: AeroElectric-List: Ground Start enunciator light (Addendum) On a related note: The instructions for modifying the receptacle call for a propane torch or "large soldering iron". How large an iron? I ask because I incinerated the phenolic insulator when I tried to solder it with my propane torch, and have just ordered a replacement receptacle to try again. If I preheat the bolt in the oven, would a Weller 100/140 soldering gun have enough oomph? If not, ????. William Slaughter -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III Sent: Sunday, March 16, 2008 9:01 PM Subject: AeroElectric-List: Ground Start enunciator light (Addendum) At 01:53 AM 3/16/2008 +0000, you wrote: > > >Listers > >I installed a Piper-type male socket to my airplane, to have the possibility >of a ground start in case of a low battery cranking difficulty. >As recommended by this List experts, I connected the socket to the battery >through a continuous duty contactor (aka Master Relay or Battery solenoid), >the S701-1 from B&C, controlled by a SPST switch, which grounds the >contactor when thrown to ON. > >Now what I want to do is to put a green enunciator light in my panel, which >illuminates when that switch is ON and the contactor is closed to allow the >ground start procedure, to remind me to switch it Off after finishing that >procedure. > >I have tried some wiring of the warning light to the switch, but I cannot >make it work properly. Can somebody please enlighten me how to wire it? Carlos, A couple of hours after I replied to this it occurred to me that you probably were not incorporating a press-to-test light fixture nor did you mention crowbar ov protection. I've updated the schematics in the article to include "Ground Power Lite" without OV protection and using a plain vanilla lamp fixture. See the last page of: http://www.aeroelectric.com/articles/grndpwr.pdf Is this more like what you needed? Bob . . . ----------------------------------------) ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ---------------------------------------- ________________________________ Message 8 _____________________________________ Time: 09:49:07 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Audio iso amp ordered, never received At 07:19 PM 3/16/2008 -0700, you wrote: > > >First, to all, Bob Nuckolls included, I apologize for bringing this up >here, but I don't see any alternative. >Bob, I ordered an audio isolation amp board from you in December and paid >using Paypal. You said you were >planning on updating the board but would pull one and send it to me. I've >sent messages through the message >area, e-mails using the address in your responses to my questions before >ordering, and a request for info on the >Aeroelectric list. I've gotten no response or recognition that you've >received any of my attempts at communication. > >So: Can you let me know what's going on with my order? I wouldn't mind >the wait if I knew something was happening >at your end but that just hasn't been the case. My apologies. I HAVE 20 some boards around here somewhere. After your request came in I modified the artwork to include some later enhancements and ordered boards. They came in with some other boards and I've misplaced them. I've had so many irons in the fire the past few months that my shop is presently in a stage II train wreck. They're not lost, I just don't know where I "filed" them. I've just ordered another batch. They should be here Wednesday morning. I'll get your board out Wednesday afternoon via priority mail. I wasn't planning on resurrecting this product but when I find the first batch, I'll have "plenty" on hand. I guess I'll have to put it back up on the website! In the mean time, things re starting to spool down a bit on the 20hr/wk (yeah right!) consulting job. Weather is getting warmer and I'd really like to get the alternator drive stand in the garage running as well as cleanup/organize the shop! Bob . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.