As you can see from my site and Roli's, the circuit I use is based on his. Prices and availability for parts seem to differ around the world. I believe SA-Diver says that he can buy all parts needed for something like $5-$10 (locally) based on his previous posts whereas a person in the U.S. would pay quite a bit more. You just have to compare apples to apples and do your research. You can use two gold plated spring loaded contacts for $3 plus $5 shipping/handling or you can use two $0.05 screws for contacts(I've used both before). I try to make mine as professional as I can and make transfers as easy as possible while still being pretty cheap. Case prices in the U.S. range from $2 and up plus shipping or $3.50 at radio shack. Drawing,etching, and drilling a single circuit board may take you 45 minutes to a couple hours. Thats included in my kit and its labeled. A kit from radio shack to etch your circuit costs just under $15 or about $10 if you only buy a copper board and etching solution and use your wife's fingernail polish remover and your kids sharpie. Resistors at radio shack come in 4 or 5 packs for $1 a pack and you need 4 different values. Diodes are another 4 bucks and transistors are almost a buck each (need 3). The serial plug and hood itself will cost you $3.50 at radio shack. You can order these for slightly cheaper, but the cost of shipping/handling offsets your savings. I buy resistors by the 1000 pack and cases 50 at a time and transistors and serial plugs 100 at a time. I also buy those expensive little gold contacts 100 at a time or more so the $5-$10 shipping charge is offset quite a bit.
A lot of people have said that I should sell my interfaces for much cheaper, but those people never seem to put their money where there mouth is and offer something cheaper. I have them listed on ebay all the time. I have them on my site for sale all the time. If a friend wants one, heck yeah I'll make it for next to nothing for them, but I can't offer that same price to anyone in the world that wants one because I end up wasting my time. I'm not selling 3 or 4 a week. If I only had a couple people ask for them a week, I would be glad to sell them for next to nothing but I couldn't afford to offer any warranty or spend any time doing email tech help for those with pc problems... I have about 100 emails to answer from over the weekend...I'm the only person that has went to the trouble to make a kit to take some of the hassle out of it and stand behind it fully. I've been in the same place as most of the people that go to Roli's site to find info on building an interface. I know all the problems in finding/matching parts to those in the UK and getting the thing to work. I know that of the thousands of transistors out there, there are almost as many possible pin layouts and that nothing is really standard so you can spend a lot of time flipping the things and never get it to work. I know all of this and thats exactly why you see kits for sale on my site. I'm in the U.S. and by the time I got my very first interface to work, I had almost $50 in it including a $9 soldering iron and it took about 3 circuits boards and a lot of soldering and resoldering to get it to work. I've been there and it can really suck. Roli is a great guy, but he can't possibly help every single person that asks him why thier interface doesn't work. I've sold a lot of kits to people that have tried and failed to build their own interface from scratch and my kit helped those same people figure out how to make their failed attempts work. To some people its simple to build and to others it's quite confusing. I'm just taking some of the confusion and hassle out of it for those that find it more difficult or are afraid of frying their suunto that they paid so dearly for.
I have a feedback rating on ebay of almost 100 (from selling interfaces alone) with 100% positive feedback the last time I checked. You can't get that at radio shack with your parts. I know that SA-diver hasn't seen my kit instructions that are on my site because they're only available for those that buy the kit because I've spent so much time taking pictures. You get a lot more detail and in depth instructions with my kit and step by step assembly pictures.
Everyone seems to have an opinion about these, but I guarantee you that there isn't a person out there thats built as many as I have, got more divers downloading their data for as cheaply as I have, and that offers a full warranty and stands behind it. I've never seen or heard of anyone else offering a kit to build these with either. If money is really tight (which isn't likely if you own a suunto anyway) you may be able to sacrifice a couple extra hours of your time to save $5 or so from the cost of my kit, but I think you'll find it isn't worth it. I'm not trying to sell anyone on this board an interface... just mainly trying to share my experiences, which weren't good initially. No one thats successfully built one will say its hard. Those that tried and failed won't most likely tell you they failed. Thats just how it goes.
I hope this gave a few people a little more info to go on and I also hope it didn't offend or upset anyone. I'm only trying to add to the discussion. I told myself I wouldn't post on this subject anymore because people would think I'm boldly trying to push my product. I'm not at all folks because I simply don't have to and don't want to push them. My interfaces and my customer's feedback does that for me. If anyone feels any part of this post is not appropriate, let me know and I'll change/erase it. I just write what comes to mind guys...
eace:
:whack: me