---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 06/01/03: 23 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:19 AM - Re: Handburn on antenna : fact or mythology ? (Gilles.Thesee) 2. 03:19 AM - Should I label wires at the connector end ? (Gilles.Thesee) 3. 05:53 AM - Re: Handburn on antenna : fact or mythology ? (Eric M. Jones) 4. 06:45 AM - Re: Re: Handburn on antenna : fact or (Canyon) 5. 10:44 AM - Re: Re: Handburn on antenna : fact or mythology ? (SportAV8R@aol.com) 6. 11:03 AM - Re: Should I label wires at the connector end ? (Don Honabach) 7. 01:43 PM - Re: Cheap blind encoder. (Gilles.Thesee) 8. 03:59 PM - Z-11 (Bobdeva@aol.com) 9. 04:15 PM - Re: Z-11 (RSwanson) 10. 04:20 PM - SEC: UNCLASSIFIED - MICROAIR RADIOS AND ICOM MICROPHONES (Francis, David CMDR) 11. 05:59 PM - My Fuel Gauge Design (j1j2h3@juno.com) 12. 06:40 PM - My Fuel Gauge Design (Eric M. Jones) 13. 07:50 PM - Odyssey PC680 terminal with larger ring terminal (Dan Checkoway) 14. 08:18 PM - Re: Odyssey PC680 terminal with larger ring terminal (Joel Harding) 15. 08:31 PM - Re: Handburn on antenna : fact or mythology ? (Jerzy Krasinski) 16. 08:46 PM - 10nF mylar cap. (Rob W M Shipley) 17. 08:47 PM - Re: Odyssey PC680 terminal with larger ring (Wallace Enga) 18. 09:17 PM - Re: Odyssey PC680 terminal with larger ring terminal (Jim Oke) 19. 09:20 PM - Re: My Fuel Gauge Design (Jerzy Krasinski) 20. 09:34 PM - Re: 10nF mylar cap. (James Jula) 21. 09:37 PM - [ Wolfgang Trinks ] : New Email List Photo Share Available! (Email List Photo Shares) 22. 09:42 PM - Re: 10nF mylar cap. (John Loram) 23. 11:45 PM - Expando Foam and Custom Boxes... (Don Honabach) ________________________________ Message 1 _____________________________________ Time: 03:19:24 AM PST US From: "Gilles.Thesee" Subject: Re: AeroElectric-List: Handburn on antenna : fact or mythology ? --> AeroElectric-List message posted by: "Gilles.Thesee" Thanks to Tom and James for their answers. Boiling blood, that's hair raising ! Never had considered that. Cheers, Gilles ________________________________ Message 2 _____________________________________ Time: 03:19:24 AM PST US From: "Gilles.Thesee" Subject: AeroElectric-List: Should I label wires at the connector end ? --> AeroElectric-List message posted by: "Gilles.Thesee" Hi Bob and all, Soldering 18-20 wires to a 25 pin D-Sub is an easy task, thanks to Bob's Shop-Note. I succeded in obtaining a neat array of wires in no time at all. But I went into the trouble of labelling each wire at the connector, which took twice the time and ended in a not too neat bunch of labels. Here is my question : Is it worth the trouble to label the wires at the connector end ? After all, isn't the pin number there to help identify the wire ? Thanks for your advice and feed-back on best practice. Cheers, Gilles ________________________________ Message 3 _____________________________________ Time: 05:53:15 AM PST US From: "Eric M. Jones" Subject: AeroElectric-List: Re: Handburn on antenna : fact or mythology ? --> AeroElectric-List message posted by: "Eric M. Jones" In common surgery, a surgeon will use a skin scalpel, but then does the majority of cutting AND WELDING of tissue with a "Bovie", the generic name for a hundred-year-old (!) electrosurgery unit. The device works by vibrating the water molecules inside the tissue cells until they explode. Thus the surgeon parts tissue like Moses through the Red Sea. Remarkably, a small tweak to the current, frequency and wave shape and the surgeon can stop bleeding and even weld tissue back together. A remarkable and NON-thermal device. Typically the voltage is hundreds of volts, the frequency is maybe a megahertz, and the delivered power can be 250 watts. Yikes! So why doesn't the patient jump right off the table like Galvani's frog? Nerve conduction progresses by the cells ions communicating from one nerve cell to another. In order to successfully conduct, the ion must travel across the cell to the cell wall. But if the electrical current reverses before this can happen, the ion only gets jostled around and never completes the whole journey. It turns out curiously, that maximum sensitivity to electrical frequencies peaks at 50-60 hertz. So what could the transmitter antenna do to your hand? if the antenna were thin enough, and tuned just right, it could cut your flesh to the bone with almost no thermal damage to adjacent tissue, so NO it's not "hot". Most antennas have too large an area to do much cutting. Nevertheless your hand would not like it even though there would be little thermal injury and no electrical shock. Regards, Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge MA 01550-2705 Phone (508) 764-2072 Email: emjones@charter.net ________________________________ Message 4 _____________________________________ Time: 06:45:01 AM PST US From: Canyon Subject: Re: AeroElectric-List: Re: Handburn on antenna : fact or mythology ? --> AeroElectric-List message posted by: Canyon Eric M. Jones wrote: >Nerve conduction progresses by the cells ions communicating from one >nerve cell to another. In order to successfully conduct, the ion must >travel across the cell to the cell wall. But if the electrical current >reverses before this can happen, the ion only gets jostled around and >never completes the whole journey. It turns out curiously, that >maximum sensitivity to electrical frequencies peaks at 50-60 hertz. --- Which, of course, is why electrical power the world over is delivered at 50 or 60HZ -- a small effort to control population growth. :-) Do Not Archive Steve ________________________________ Message 5 _____________________________________ Time: 10:44:21 AM PST US From: SportAV8R@aol.com Subject: Re: AeroElectric-List: Re: Handburn on antenna : fact or mythology ? --> AeroElectric-List message posted by: SportAV8R@aol.com In a message dated 6/1/2003 8:53:39 AM Eastern Daylight Time, emjones@charter.net writes: > Remarkably, a small tweak to the current, frequency and wave shape and the > surgeon can stop bleeding and even weld tissue back together All the Bovie units I've ever see had settings for cutting and cautery. "Weld" was not an option. I suppose buzzing a bleeder until it stops pumping looks somewhat like making a spot weld, but I think it comes under the cautery category. Is there something new in the OR I need to know about? The ability to weld tissues that are 85% water sounds far-fetched, but maybe this would offer a way to repair my next torn hydrophilic contact lens :-) -Bill B RV-6A not a surgeon but I've got the papers, and I did sleep at a Holiday Inn Express once do not archive ________________________________ Message 6 _____________________________________ Time: 11:03:07 AM PST US Subject: RE: AeroElectric-List: Should I label wires at the connector end ? From: "Don Honabach" --> AeroElectric-List message posted by: "Don Honabach" >> Soldering 18-20 wires to a 25 pin D-Sub is an easy task...Is it worth the trouble to label the wires at the connector end ? If it were me, I would just document the number/wire relationship and put it with the rest of the planes diagrams, notes, etc. You could also make a small label and put it near the connector if possible, however, if once everything gets closed up and such it my not be practical to read the label and then the docs make the most sense. Don -----Original Message----- From: Gilles.Thesee [mailto:Gilles.Thesee@ac-grenoble.fr] Subject: AeroElectric-List: Should I label wires at the connector end ? --> AeroElectric-List message posted by: "Gilles.Thesee" --> Hi Bob and all, Soldering 18-20 wires to a 25 pin D-Sub is an easy task, thanks to Bob's Shop-Note. I succeded in obtaining a neat array of wires in no time at all. But I went into the trouble of labelling each wire at the connector, which took twice the time and ended in a not too neat bunch of labels. Here is my question : Is it worth the trouble to label the wires at the connector end ? After all, isn't the pin number there to help identify the wire ? Thanks for your advice and feed-back on best practice. Cheers, Gilles direct advertising on the Matronics Forums. ________________________________ Message 7 _____________________________________ Time: 01:43:02 PM PST US From: "Gilles.Thesee" Subject: Re: AeroElectric-List: Cheap blind encoder. --> AeroElectric-List message posted by: "Gilles.Thesee" ----- Message d'origine ----- De : "Robert L. Nuckolls, III" : Envoy : jeudi 15 mai 2003 06:24 Objet : Re: AeroElectric-List: Cheap blind encoder. > You can drive multiple loads with one encoder but you need an array of > diodes to avoid cross-coupled problems between loads. I don't > recall now exactly how the diodes are oriented. I searched the > net and found some encoder loads (transponders) that claim > to have isolation diodes installed. > ................. > > The neatest way to install this raft of diodes > is to lay out a simple etched circuit board with > d-sub connector to bring wires onto and off the > board. For driving two loads, there's a total > 27 wires . . . a single 37-pin D-sub would > do it. > Hi Bob and all, What could be a simple way to make the above etched circuit board ? I'm not equipped for etching circuits, nor designing them. Any suggestions ? Thanks, Gilles ________________________________ Message 8 _____________________________________ Time: 03:59:38 PM PST US From: Bobdeva@aol.com Subject: AeroElectric-List: Z-11 --> AeroElectric-List message posted by: Bobdeva@aol.com Bob I'm trying to download Z11 in order to get a more legible copy than the one in the Aeroelectric Connection. I want to enlarge it to make it more compatible with a pair of 72 year old eyes. When I download it, all I get is a lot of text/garbage not the drawing. What am I doing wrong. Airplanes I know... computers, well that's another story. Thanks, Bob Devaney ________________________________ Message 9 _____________________________________ Time: 04:15:20 PM PST US From: RSwanson Subject: Re: AeroElectric-List: Z-11 --> AeroElectric-List message posted by: RSwanson I just downloaded and it works as advertised. I opened it with TurboCAD LE. Are you saving it first? R ----- Original Message ----- From: Subject: AeroElectric-List: Z-11 > --> AeroElectric-List message posted by: Bobdeva@aol.com > > Bob > I'm trying to download Z11 in order to get a more legible copy than the one > in the Aeroelectric Connection. I want to enlarge it to make it more > compatible with a pair of 72 year old eyes. When I download it, all I get is a lot of > text/garbage not the drawing. What am I doing wrong. Airplanes I know... > computers, well that's another story. > > Thanks, Bob Devaney > > ________________________________ Message 10 ____________________________________ Time: 04:20:35 PM PST US From: "Francis, David CMDR" Subject: AeroElectric-List: SEC: UNCLASSIFIED - MICROAIR RADIOS AND ICOM MICROPHONES --> AeroElectric-List message posted by: "Francis, David CMDR" Folks, Below is a repeat of an advisory from an Australian glider parts supplier which may explain to you some sensitivities of Midroair radios matched to Icom hardware. Regards, David Francis, VH-ZEE, Canberra, Australia. TO ANYBODY IN GLIDING USING MICROAIR RADIO AND ICOM BOOM MIC (the thin and short silver booms and insert not changed) please read on and alert others within your club I am realising there are still Microairs radios linked to Icom flexible boom mics. There can be problems with this installation as I have found the hard way and I know Nigel Andrews the designer has found this also. It shows itself that every now and then a transmittion does not get out and the radio is blamed for the fault. After about 3 different radios in an ASH25E I changed the electret insert in the Icom booms and it has been perfect since. I have just this week heard of a IS28 at Camden with a Microair and the thin silver Icom booms and radio problems!! Also Canberra Club were planning to upgrade radios and they had the Icom booms. In the past I sent out almost 50 microphones (to many countries I might add) with a changed spec insert which I was caught by and all had to come back. For some reason unknown to me Microairs are touchy when it comes to electret inserts. The fix is simple remove the Icom insert and change to Altronics part no C 0170. I do know there is a DSE insert which is OK but you should check with Nigel for exact cat no. There is a trick in getting them apart as you can only just get the insert unsoldered as a knot in coax restricts removal. This knot can be moved by undoing the mic head from gooseneck with mini-mini allen key. I can supply inserts at $2.30 if you can not get them locally. Alternatively I have an exchange service for Icom mics and at the same time I strengthen the base so hopefully they will not fail in the future. The big problem is I only have one exchange boom that I can send out at a time. If your glider is out of air for Form 2 then that is a good time to return same. I suggest a green paint dot on insert to indicate it has been changed. So if you see somebody in your club not on this list and the have the Microair/Icom combination please alert them as it would be wonderful to see this problem gone once and for all !! PLEASE!!!! Bye Ian McPhee Box 657 Byron Bay NSW 2481 Australia Tel +61 (0)2 66 847 642 Mob +61 (0)428 847 642 iankmcphee@bigpond.com www.mrsoaring.com and being revamped next week!!. . ________________________________ Message 11 ____________________________________ Time: 05:59:04 PM PST US Subject: AeroElectric-List: My Fuel Gauge Design From: j1j2h3@juno.com --> AeroElectric-List message posted by: j1j2h3@juno.com What is the dimension fron the top of the tank for the 4.4% thermistor? Jim Hasper - RV-7 just starting empennage (on hold pending move to Tennessee) Do not archive On 5/29/03, Eric M. Jones" wrote: (snip) Put ten tiny tiny tiny 0805 size PTC thermistors on a flex circuit with a Gortex sleeve over it. Arrange these logarithmically so that they can be read-out by a 10-led bar graph. Stuff it through a 1/4" rivnut installed in each tank. On the instrument panel, 10 leds100%, 9 leds70.7%, 8 leds50%, 7 leds35.4%, 6 leds+ 25%, 5 leds17.7%, 4 leds12.5%, 3 leds8.8%, 2 leds6.2%, 1 led4.4%. The best thing to hit the internet in years - Juno SpeedBand! Surf the web up to FIVE TIMES FASTER! ________________________________ Message 12 ____________________________________ Time: 06:40:55 PM PST US From: "Eric M. Jones" Subject: AeroElectric-List: My Fuel Gauge Design --> AeroElectric-List message posted by: "Eric M. Jones" >--> AeroElectric-List message posted by: j1j2h3@juno.com >What is the dimension from the top of the tank for the 4.4% thermistor? >Jim Hasper - RV-7 just starting empennage (on hold pending move to >Tennessee) >Do not archive >On 5/29/03, Eric M. Jones" wrote: >(snip) >Put ten tiny tiny tiny 0805 size PTC thermistors on a flex circuit with a >Gortex sleeve over it. Arrange these logarithmically so that they can be >read-out by a 10-led bar graph. Stuff it through a 1/4" rivnut installed in each >tank. On the instrument panel, 10 leds100%, 9 leds70.7%, 8 leds50%, 7 leds35.4%, 6 >leds+25%, 5 leds17.7%, 4 leds12.5%, 3 leds8.8%, 2 leds6.2%, 1 led4.4%. Eric says--I don't know. Adjustments can be made. (Just to be sure we're clear--the 4.4% is close to the bottom) I just bought 4000 PTC thermistors 0805 chips on eBay for $4. They are not quite what I wanted but.....cheap! Regards, Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge MA 01550-2705 Phone (508) 764-2072 Email: emjones@charter.net Most people don't appreciate how hard it is to be a princess. -Princess Diana ________________________________ Message 13 ____________________________________ Time: 07:50:04 PM PST US From: "Dan Checkoway" Subject: AeroElectric-List: Odyssey PC680 terminal with larger ring terminal --> AeroElectric-List message posted by: "Dan Checkoway" The cap screws on the Odyssey PC680's terminals are 3/16" (I believe). I was planning on using the 2 AWG 5/16" ring terminals that came with Van's basic wiring kit. How have others handled this...do you have to use ring terminals with a smaller hole, or can you use the 5/16" terminal? It looks like once tightened it'll be fine, but I'm curious if it's generally acceptable that way. Sorry if there's an obvious answer to this... )_( Dan RV-7 N714D http://www.rvproject.com ________________________________ Message 14 ____________________________________ Time: 08:18:25 PM PST US Subject: Re: AeroElectric-List: Odyssey PC680 terminal with larger ring terminal From: Joel Harding --> AeroElectric-List message posted by: Joel Harding Dan, Get on the Aeroelectric website, choose tools and materials, and somewhere down the list are ring terminals for #2 wire with an assortment of hole sizes. I just got some and they work great. Joel Harding On Sunday, June 1, 2003, at 08:45 PM, Dan Checkoway wrote: > --> AeroElectric-List message posted by: "Dan Checkoway" > > > The cap screws on the Odyssey PC680's terminals are 3/16" (I believe). > I > was planning on using the 2 AWG 5/16" ring terminals that came with > Van's > basic wiring kit. > > How have others handled this...do you have to use ring terminals with a > smaller hole, or can you use the 5/16" terminal? It looks like once > tightened it'll be fine, but I'm curious if it's generally acceptable > that > way. > > Sorry if there's an obvious answer to this... > > )_( Dan > RV-7 N714D > http://www.rvproject.com > > > _- > ====================================================================== > _- > ====================================================================== > _- > ====================================================================== > _- > ====================================================================== > > ________________________________ Message 15 ____________________________________ Time: 08:31:20 PM PST US From: Jerzy Krasinski Subject: Re: AeroElectric-List: Handburn on antenna : fact or mythology ? --> AeroElectric-List message posted by: Jerzy Krasinski Gilles.Thesee wrote: >--> AeroElectric-List message posted by: "Gilles.Thesee" > >Hi Bob and all, > >Here is a question that has kept bothering me for several weeks : >A month ago I witnessed the electrician in an FBO advise his co-wokers never >to touch a comm antenna during transmission. He said he did once and got a >handburn. > >Question : How hot can an antenna get ? Was he telling the truth, or was he >just reporting another hangar tale ? What is the physics behind the story ? > >Thank you for any feedback or explanation >Regards > >Gilles > Gilles, A well designed antenna is not supposed to get hot. If it gets hot that means that there is somewhere a high contact resistance and it is converting power from the transmitter into heat rather than into waves. However, some heat will be generated in your hand if you put it too close to the operating antenna in the area of a strong field. Same thing as placing your hand in a microwave oven, except a different power level. A microwave oven generates hundreds of watts, or even above a kilowatt. The airplane transmitter usually generates below 10W, and only a fraction of that would be coupled into your finger. That power is comparable to a very small soldering iron, but you would not like to hold even a small operating soldering iron in your hand. Making it short, an antenna with a power of several watts might make a small burn if you touch it, but stay away from high power antennas, they can make large burns. If you touch a high voltage area of an antenna fed with several hundred watts, an arc like in an electric welder will start between your finger and the antenna creating a lot of damage. With higher power antennas it is easy to get in trouble even without touching them. Get too close and they will overheat you and ruin your eyes or kidneys which are very heat sensitive, no matter that antenna is quite cold. The bad thing is that when the whole body is uniformly heated we do not feel much of a problem as it is in the case of localized surface heating, and the result might be very bad. But I hope you are not installing several kilowatt transmitter in your plane : ) Jerzy > > ________________________________ Message 16 ____________________________________ Time: 08:46:06 PM PST US From: "Rob W M Shipley" Subject: AeroElectric-List: 10nF mylar cap. --> AeroElectric-List message posted by: "Rob W M Shipley" I decided that I'd like to make the warning circuit Jim Weir put in this months KitPlanes. I visited my local Radio Shack and was able to get everything except the 10nF mylar capacitor. They told me that they have never stocked capacitors this small!!!! All the other local sources had nothing either and I'm reluctant to try Mouser or Digikey for one mylar capacitor. Does aanyone have any suggestions or better yet does anyone have one of these they could sell me? Any help gratefully received. Rob Rob W M Shipley RV9A N919RV Fuselage - now a canoe!!! ________________________________ Message 17 ____________________________________ Time: 08:47:41 PM PST US From: Wallace Enga Subject: Re: AeroElectric-List: Odyssey PC680 terminal with larger ring terminal --> AeroElectric-List message posted by: Wallace Enga Another way to do it is to get a SAE Terminal Adapter Kit which has brass posts that screw into the PC680 and then you can use a 3/8" brass bolt for your ring terminals. I got mine from Cell Energy, Inc Part # 3217-0006 , not cheap they were about $15. I also just saw them in the latest Wick's catalog at about the same price. Wally Enga RV7 N757E >The cap screws on the Odyssey PC680's terminals are 3/16" (I believe). I >was planning on using the 2 AWG 5/16" ring terminals that came with Van's >basic wiring kit. > >How have others handled this...do you have to use ring terminals with a >smaller hole, or can you use the 5/16" terminal? It looks like once >tightened it'll be fine, but I'm curious if it's generally acceptable that >way. > >Sorry if there's an obvious answer to this... > >)_( Dan >RV-7 N714D >http://www.rvproject.com > ________________________________ Message 18 ____________________________________ Time: 09:17:22 PM PST US From: Jim Oke Subject: Re: AeroElectric-List: Odyssey PC680 terminal with larger ring terminal --> AeroElectric-List message posted by: Jim Oke The PC680 terminals use a female 6 mm metric thread. This is approximately 1/4 inch for sizing ring terminals, but users will have to locate 6 mm bolts/cap screws or whatever to do the final connection. (Unless Odessy is including the bolts these days - they were not included with my PC680). Jim Oke Winnipeg, MB ----- Original Message ----- From: "Dan Checkoway" Subject: AeroElectric-List: Odyssey PC680 terminal with larger ring terminal > --> AeroElectric-List message posted by: "Dan Checkoway" > > The cap screws on the Odyssey PC680's terminals are 3/16" (I believe). I > was planning on using the 2 AWG 5/16" ring terminals that came with Van's > basic wiring kit. > > How have others handled this...do you have to use ring terminals with a > smaller hole, or can you use the 5/16" terminal? It looks like once > tightened it'll be fine, but I'm curious if it's generally acceptable that > way. > > Sorry if there's an obvious answer to this... > > )_( Dan > RV-7 N714D > http://www.rvproject.com > > ________________________________ Message 19 ____________________________________ Time: 09:20:01 PM PST US From: Jerzy Krasinski Subject: Re: AeroElectric-List: My Fuel Gauge Design --> AeroElectric-List message posted by: Jerzy Krasinski > > >>On 5/29/03, Eric M. Jones" wrote: >>(snip) >>Put ten tiny tiny tiny 0805 size PTC thermistors on a flex circuit with a >>Gortex sleeve over it. Arrange these logarithmically so that they can be >>read-out by a 10-led bar graph. Stuff it through a 1/4" rivnut installed in each >>tank. On the instrument panel, 10 leds100%, 9 leds70.7%, 8 leds50%, 7 leds35.4%, 6 >>leds+25%, 5 leds17.7%, 4 leds12.5%, 3 leds8.8%, 2 leds6.2%, 1 led4.4%. >> >> >\ > Just guessing the principle of operation..The thermistors are heated by current, The thermistors in liquid are efficiently cooled, their temperature is almost equal to the temperature of the liquid, and their resistance is low. The thermistors above the liquid do not have much cooling , they get hot, their resistance goes up. The system monitors resistance of the thermistors and can figure out the position of the surface of the liquid. However, temperature of the liquid is not constant, it can vary between say 40C on a hot day in Oklahoma to say -20C on a cold day somewhere further North . To make it more complicated all PTC thermistors that I was working with had positive coefficient within relatively narrow temperature range, and outside of that range they behaved like standard NTC thermistors. I believe that all PTC thermistors behave that way. That would require to select a PTC thermistor with positive coefficient temperature range somewhere above the highest posible ambient temperature, say above 50C. Here comes a possible problem. When it is very cold the PTC thermistor runs into normal NTC range, its resistance goes up, the thermal power generated in the thermistor goes down, and that power might not be sufficient to heat it up to 50 deg even if it is above the liquid. There is another possible problem. Imagine that it is very hot outside, the thermistor is additionaly heated by the current, it gets very hot until it jumps over the PTC range into the normal NTC range. Now its resistance decreasesas as it gets hotter, which pumps more current into it, which makes it hotter and lower resistance, which pumps even more current, etc., until it melts. Both problems can be solved driving the thermistors from a proper current source. However, the second problem might still happen producing false reading rather than melt down. There is an additional problem of comparing (changing with ambient temperature) resistance of the submerged thermistors with also changing with the ambient resistance of the thermistors above the surface. It is possible that there is a trick which might make it easy, but it seems again that interpretation of the results would be the easiest with a microcontroller that would sequentially measure resistance of thermistors and set the liguid level between the group of thermistors with equal (but not constant) resistance, and the first hotter one. Am I missing something? Is there an easy way? Jerzy > > ________________________________ Message 20 ____________________________________ Time: 09:34:12 PM PST US From: "James Jula" Subject: RE: AeroElectric-List: 10nF mylar cap. --> AeroElectric-List message posted by: "James Jula" They have them, they probably did not recognize the nF reference. Ask for a 0.01uF cap, it is the same size. They show up on the Radio Shack website. They carry capacitors much smaller, as low as 1pF (0.001nF). Sometimes you need to purchase capacitor packs to get what you want there. James --> AeroElectric-List message posted by: "Rob W M Shipley" I decided that I'd like to make the warning circuit Jim Weir put in this months KitPlanes. I visited my local Radio Shack and was able to get everything except the 10nF mylar capacitor. They told me that they have never stocked capacitors this small!!!! All the other local sources had nothing either and I'm reluctant to try Mouser or Digikey for one mylar capacitor. Does aanyone have any suggestions or better yet does anyone have one of these they could sell me? Any help gratefully received. Rob Rob W M Shipley RV9A N919RV Fuselage - now a canoe!!! ________________________________ Message 21 ____________________________________ Time: 09:37:54 PM PST US Subject: AeroElectric-List: [ Wolfgang Trinks ] : New Email List Photo Share Available! From: Email List Photo Shares --> AeroElectric-List message posted by: Email List Photo Shares A new Email List Photo Share is available: Poster: Wolfgang Trinks Subject: LUN2141 Regulator Schematic http://www.matronics.com/photoshare/Wolfgang.Trinks@flugbereitschaft.com.06.01.2003/index.html o Main Photo Share Index http://www.matronics.com/photoshare o Submitting a Photo Share If you wish to submit a Photo Share of your own, please include the following information along with your email message and files: 1) Email List or Lists that they are related to: 2) Your Full Name: 3) Your Email Address: 4) One line Subject description: 5) Multi-line, multi-paragraph description of topic: 6) One-line Description of each photo or file: Email the information above and your files and photos to: pictures@matronics.com ________________________________ Message 22 ____________________________________ Time: 09:42:48 PM PST US From: John Loram Subject: RE: AeroElectric-List: 10nF mylar cap. --> AeroElectric-List message posted by: John Loram 10nF = .01uF. Radio Shack has them. nano-Farad is a relatively recent term. You won't find in in most catalogs (e.g. Digikey). 1 nano farad is still often written as 0.001 uF 1000 pico Farad (pF) = 1 nano Farad (nF) 1000 nano Farad (nF) = 1 micro Farad (uF aka mFd) 1,000,000 microFarad (uF) = 1 Farad milliFarad is not used. Or at least I've never (in 50 years) seen it. regards, -john- john@loram.org www.loram.org -----Original Message----- From: Rob W M Shipley [mailto:Rob@RobsGlass.com] Subject: AeroElectric-List: 10nF mylar cap. --> AeroElectric-List message posted by: "Rob W M Shipley" I decided that I'd like to make the warning circuit Jim Weir put in this months KitPlanes. I visited my local Radio Shack and was able to get everything except the 10nF mylar capacitor. They told me that they have never stocked capacitors this small!!!! All the other local sources had nothing either and I'm reluctant to try Mouser or Digikey for one mylar capacitor. Does aanyone have any suggestions or better yet does anyone have one of these they could sell me? Any help gratefully received. Rob Rob W M Shipley RV9A N919RV Fuselage - now a canoe!!! ________________________________ Message 23 ____________________________________ Time: 11:45:04 PM PST US Subject: AeroElectric-List: Expando Foam and Custom Boxes... From: "Don Honabach" --> AeroElectric-List message posted by: "Don Honabach" I'm in the process of retrofitting my Garmin GPS 195 handheld unit to my panel (I love this unit - one of the best I've seen even though it's an old one by technology's standards). Because my panel is small (Zodiac 601) and the unit's full height will interfere with my layout I've taken the GPS apart and looked for ways to mount just the screen and buttons to the panel and save the 1.5 inches of 'wasted' built-in antenna space which is exactly what I need to get the unit to fit. It does look like I'll be able to rig something together for the panel mounting the key components of the GPS, but will then have to put the main circuit board for the GPS in a box and mount it behind of the panel where I have more space options. I remember seeing an article about if you needed a quick dirty way to keep a circuit board secure in a box, you could use the expanding insulation foam to secure the circuit board. Obviously, this would make working on the board in the future difficult if not impossible, but I highly doubt I'll be troubleshooting a high denisty board with 99.9% surface mounted components. Also, this would make sure the board was protected from the vibrations as well. Any way, was hoping to get some thoughts on using the expanding foam to secure the main PCB in a box - pros or cons... Thanks! Don Honabach Tempe, AZ - 601HDS P.S. If for some reason this doesn't work, I can always just go purchase a Garmin GPS Pilot III which will fit very nicely without any mods, but that would be the easy way and then I'd end up with a smaller GPS screen ;)