HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Sep 17, 2008, 12:44 PM
Registered User
Pensacola, FL, USA
Joined Dec 2000
3,235 Posts
New Product
Better phone jack for switching & charging

Have discovered much better phone jack for switching and charging HL battery packs.

This one from Radio Shack is completely enclosed case which protects from shorting out and bending of open switch contacts. Pt.Nr. 274-246.

Also has at least ten times the switch contact area which should be a lot safer than the standard open type 1/8" audio jacks designed for millivolt circuits.

http://www.radioshack.com/product/in...entPage=search

Cheers,
John255
John255 is offline Find More Posts by John255
Reply With Quote
Sign up now
to remove ads between posts
Old Sep 17, 2008, 01:13 PM
Look out! The lever!
bobthenuke's Avatar
United States, AZ, Peoria
Joined Feb 2005
2,601 Posts
John,

Do you have any weight information on this part? Always an issue with DLGs, as I'm sure you know.

Thanks,

-bob
bobthenuke is offline Find More Posts by bobthenuke
Reply With Quote
Old Sep 17, 2008, 01:17 PM
Registered User
Pensacola, FL, USA
Joined Dec 2000
3,235 Posts
Quote:
Originally Posted by bobthenuke
John,
Do you have any weight information on this part? Always an issue with DLGs, as I'm sure you know.Thanks,-bob
Bob,
Weight is exactly same as open type 1/8" jack very close to one gram. My scale is not the best in that range.
John255
John255 is offline Find More Posts by John255
Reply With Quote
Old Sep 17, 2008, 01:18 PM
Registered User
Slopeman's Avatar
Oakland California
Joined Jun 2004
39 Posts
I would like to know how you assemble the 1/8'' Stereo Mount Phone Jack where you solder on the leads. What are the two non rechargeable Duracells doing ?
Are they just a backup or is this a DLG? Sorry for the dumb questions but I would like to make some myself and could use step by step instructions.
Slopeman is online now Find More Posts by Slopeman
Reply With Quote
Old Sep 17, 2008, 01:26 PM
Registered User
Pensacola, FL, USA
Joined Dec 2000
3,235 Posts
Quote:
Originally Posted by Slopeman
I would like to know how you assemble the 1/8'' Stereo Mount Phone Jack where you solder on the leads. What are the two non rechargeable Duracells doing ?Are they just a backup or is this a DLG? Sorry for the dumb questions but I would like to make some myself and could use step by step instructions.

Slopeman,
The non-rechargeable camera cells CR-2's are flying my 2-channel planes.

They are about 1500 mA that give me 22+ hours of flying time. The decay curve is not too steep and therefore I find them safer than small NiMh packs that only give about 1.5 hours and can decay very fast.

I'm sure there's more than one post on soldering up charging jacks. I can't find mine. Recommend a search.

Regards,
John255
John255 is offline Find More Posts by John255
Reply With Quote
Old Sep 17, 2008, 06:25 PM
Walter Roos
ROOSWH's Avatar
Canton, Ga.
Joined Aug 2004
3,195 Posts
Radio Shack Switch Jack---I don't think so

John,
The use of any Radio Shack switch jack is just an accident waiting to happen. IMO This topic has been discussed many times on this Hand Launch Forum and as well as I can remember, the bottom line amoung those who have been flying DLG for these many years is that most of them, myself included, will not trust their precious DLG high dollar gliders to any Radio Shack switch. Most, if not all, of the major builders include Switch Craft or "similar" plugs and jacks with their ARF kits.
I have been into electronics for over 50 years and I believe for most of the time Radio Shack has been selling their stuff, they have been selling a high profit, lower quality, non industrial standard product.
Just because their jacks look good, doesn't mean they will hold up to the many tens, hundreds, or thousands of cycles of insertions that a quality jack is tested too. Many have found this out the hard way.
I know of several occasions where the contact material on their jacks, lost their tension and allowed the switch to fail.

Unless you can verify the quality specifications of those Radio Shack switches. You may find out why I feel so strongly about this subject.

Best to you all,

walt

PS I am adding this link I lifted from post # 55 by Endless Sloper , it is the best info I've seen on this subject. but note the prices are out of date.

http://www.hollyday.com/rich/hd/sail...witchjacks.htm
ROOSWH is offline Find More Posts by ROOSWH
Last edited by ROOSWH; Nov 09, 2008 at 08:51 AM.
Reply With Quote
Old Sep 17, 2008, 07:20 PM
Registered User
Pensacola, FL, USA
Joined Dec 2000
3,235 Posts
Where are Switchraft components made these days??

Walt,
I believe you are making some gross generalizations here possibly without the benefit of evaluating or even seeing the subject item.

No question many of RS components are definitely low end, high profit items, but to say everything in the store is junk is a bit broad.

I know about the experience many have had using cheap 1/8" jacks designed for millivolt audio applications. I too have had poor results with these.

Switchcraft jacks designed for power applications seem to be doing much better, but I've had problems with the switch on them also.

This particular RS jack not only has a switch contact blade 1/8" wide, but also has double switches that can be wired in parallel. for double protection.

I cannot say how the metal will hold up to thousands of insertions, but I don't think Switchcraft publishes that information for PS jacks either.

A device to do that testing would be an interesting project, and maybe somewhat suggestive for the younger guys.

In next couple days I will disassemble one of each type and shoot the parts for comparison.

I think most flyers would be surprised to see the minimal switch contacts they are trusting their planes to.

I graduated in '54 with an EE, so apparently you and I are of the same vintage.
Cheers,
John255
John255 is offline Find More Posts by John255
Reply With Quote
Old Sep 17, 2008, 08:28 PM
Walter Roos
ROOSWH's Avatar
Canton, Ga.
Joined Aug 2004
3,195 Posts
Don't put words in my mouth please

Hi John,
Good to discuss this with you.

Your Quote "No question many of RS components are definitely low end, high profit items, but to say everything in the store is junk is a bit broad."

Funny I don't remember saying anything like "" everything in the store is junk", but if you could read my mind you would find I pretty much feel that way about their audio, power and switch components, except I try not to generalze out loud.

Please don't put words in my mouth. My foot is usually taking up space there.

The SwitchCraft jacks and plugs "most" DGLers use are designed for audio use and other. That does not take away from their ability to serve properly our DGL uses at the current levels we need = about 100ma. They will handle considerbly more current than that.

Indeed the SwitchCraft and other high end switches and jacks are backed up by complete specifications including life expectancy in cycles, etc.

Electronic Engineers and Designers must have the specifications of components going into their equipment. This information can usually be found on the web sites and sometimes in the catalogs, in brief form , of sellers such as Mouser and Digital? Electronics, and of course at SwitchCraft.

I've done my best to give needed information here and to express my opinion, what you do is of course up to you.

No hard feelings I hope, I know "I'm Good"

walt
ROOSWH is offline Find More Posts by ROOSWH
Reply With Quote
Old Sep 18, 2008, 09:09 AM
Don't worry about it!
j.m.'s Avatar
Raleigh NC
Joined May 2008
1,368 Posts
I messed around with a couple of the "cheap" radio shack jacks, and I have found that the reason why so many say they fail prematurely is because they need to learn how to solder. If you hold the iron on the terminals for more than a couple seconds, the metal heats up and is tempered. (weakens the spring action) I tested one to 100 cycles, but my wrist started to hurt around 60. They work pretty good.

The only thing I don't like is that they are open to be shorted out by pushrods.

And yes, the contact area is EXTREMELY small. at 1 amp of current, is would probably melt the terminals and be welded shut. (wanna ask me how I know???)

Maybe it's just me, but I have this thing about buying in stores. I would rather purchase a slightly inferior product and slightly increased price in stores, as opposed to purchasing online.

How much was this little jack that you found?
j.m. is offline Find More Posts by j.m.
Last edited by j.m.; Sep 18, 2008 at 03:52 PM.
Reply With Quote
Old Sep 18, 2008, 09:24 AM
Stangely Spinning in a Circle
Griphon's Avatar
Salisbury, MD
Joined Sep 2002
566 Posts
I've used two radio shack jacks in my contest DLGs and have never had a problem. I personally like the radio shack ones versus the switchcraft because I can actually solder into them. I guess it's just a matter of opinion. Great find by the way.
Griphon is offline Find More Posts by Griphon
Reply With Quote
Old Sep 18, 2008, 09:31 AM
Don't worry about it!
j.m.'s Avatar
Raleigh NC
Joined May 2008
1,368 Posts
I know it would be bigger, but a design that uses an actual spring instead of a flexing piece of metal would be many times more durable.
j.m. is offline Find More Posts by j.m.
Reply With Quote
Old Sep 18, 2008, 09:44 AM
Laughs at his own jokes.
IwantaJet's Avatar
Missoula, Montana, United States
Joined Feb 2002
1,168 Posts
Check out this jack from Canuck Engineering. There are prewired and unwired versions. I have used them in slope planes and can testify to their reliability.

Roy
IwantaJet is offline Find More Posts by IwantaJet
Reply With Quote
Old Sep 18, 2008, 10:18 AM
Registered User
Cocoa, Florida
Joined Dec 2001
272 Posts
Charging jacks for gliders

I decided not to mess with one on my first DLG ( a DL50).
I just got a short (6", IIRC) servo extension cable and plugged that into the battery slot on the receiver.
Now, I just open the hatch (by sliding a rubber band back!) and plug the battery lead into the extension cable for my "switch".
Been doing Land Mobile Radio tech work for 34 years now for GE, Motorola, and NASA, since getting out of the Air Force.
That doesn't make me an "expert" by any stretch, especially when compared to the folks who really ARE as "good" as Walt! :-)
I'm sure I'll now hear why doing it my way is a REALLY bad idea, but I don't care.
"If it ain't broke, don't FIX it!" :-)
Bob
bmwbob is offline Find More Posts by bmwbob
Reply With Quote
Old Sep 18, 2008, 11:12 AM
Chuck 'Em and Chase 'Em
Fly2High's Avatar
United States, NY, Plainview
Joined Aug 2005
8,094 Posts
Can anyone validate the comment that the radio Shack jacks could short out when inserting the plug?

I stopped using them because I had heard of this.
Fly2High is online now Find More Posts by Fly2High
Reply With Quote
Old Sep 18, 2008, 11:37 AM
Registered User
Pensacola, FL, USA
Joined Dec 2000
3,235 Posts
Similar??? Same???

OK, glad Walt chimed in because he got me to look closely at Switchraft.

First I got interested in the RS jack because it was completely enclosed and it had two single pole switches that could be wired in parallel.
If one goes the other may hold.

The Switchcraft site page shows a jack with same enclosed design and pin locations. See Swichcraft picture below. They also mention 5000 operations minimum. I stand corrected on that point. I suppose with a bit of silicone lube you could get even more, especially if you were into activating your jack for pleasure.

The SC may be different from RS unit, but I suspect both are made in the East because it's the only SC jacks listed as 3.5mm all other s are in inches.
SoaringUSA, and Polecat sell an assembled unit ($25~30) that looks like it uses similar enclosed jack, maybe a bit smaller.

If you're not expert at soldering that would be safest way to go.
Mouser has the double Switchcraft jack for $1.25, and the similar RS jack is $2.49. So in this case, if you don't want to buy the cheap one you would have get the RS.
http://www.mouser.com/Search/Refine....ord=35rapc4bh3
However, if you are ordering, I would go along with Walt that Switchcraft definitely has the better reputation for quality.
Best of luck to all.
John255
John255 is offline Find More Posts by John255
Last edited by John255; Jun 08, 2009 at 03:16 PM.
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Has anybody used cell phone batteries for their plane! funflyer Power Systems 17 Oct 15, 2010 10:55 PM
Using "on/off" timer for maintainace charging RickTatem Power Systems 3 Feb 08, 2002 11:37 AM
cheap cell phone battery for lite stick Skywalker Parkflyers 1 Jun 01, 2001 02:43 PM
Has anybody used cell phone batteries for their plane! funflyer Foamies (Kits) 2 Apr 24, 2001 08:36 PM
Using T x charger for slo charging sambo Electric Plane Talk 2 Apr 23, 2001 04:13 AM