Hello folks! It's good to be back on the list after a... well, I don't know how long, something like a two or three year hiatus. At any rate, I'd like to get back into things by asking whether anyone has good plans for building a 20ma current loop to RS-232 converter. I recently found a Teletype model 33 ASR at a flea market for $40, along with manuals, and I've nursed it back to health. With cleaning, degreasing, and a proper lubrication job, it seems to be working perfectly (well, 99% perfectly) in local mode. I'd like to get it talking to something that speaks RS-232. I've found a number of solutions for sale in the $50 range, but I was hoping to be a cheap bastard and build one myself. I've found a few schematics for hacks online, but no definitive plans for a reasonably robust home made solution. Yes, I suppose I could try to design my own. My horrible, embarrassing secret, though, is that while I'm a good programmer, I suck at circuit design. Never really got it. I can follow a schematic and solder my way to happy results, but don't ask me to design a light switch. I'll get it wrong. I've scoured the logs here, but I haven't found what I'm looking for. Anyone know where I should look? Otherwise, I guess I'll just have to give BlackBox my $50 and swallow my pride! -Seth