--_002_010701cbcf6dfcafddc00300a8c0main_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable William Couture wrote: > Can anyone point me to a source for small/flat (low-profile) jumpers, > like the ones used on hard drive controllers? Do these need to be user-changed, or are these something set once during manufacturing. If the latter, you can use solder jumpers. I started experimenting with this idea a few years ago, and think I've got the size and shape figured out pretty well now. The jumper is a disk of copper split up the middle with a gap and soldermask over the gap. With th= e right size disk and gap, it's very easy to switch the jumper between open and closed with a soldering iron. After putting a medium glob of solder on the two pads, a swipe with the soldering iron one way bridges the gap and the other way opens it. I have attached the Eagle script for this jumper package exported from my connectors library. --_002_010701cbcf6dfcafddc00300a8c0main_ Content-Type: text/plain; name="ATT00001.txt" Content-Description: ATT00001.txt Content-Disposition: attachment; filename="ATT00001.txt"; size=208; creation-date="Fri, 18 Feb 2011 05:23:13 GMT"; modification-date="Fri, 18 Feb 2011 05:23:13 GMT" Content-Transfer-Encoding: base64 LS0gDQpodHRwOi8vd3d3LnBpY2xpc3QuY29tIFBJQy9TWCBGQVEgJiBsaXN0IGFyY2hpdmUNClZp ZXcvY2hhbmdlIHlvdXIgbWVtYmVyc2hpcCBvcHRpb25zIGF0DQpodHRwOi8vbWFpbG1hbi5taXQu ZWR1L21haWxtYW4vbGlzdGluZm8vcGljbGlzdA0K --_002_010701cbcf6dfcafddc00300a8c0main_-- .