partial P112 kits

On 6/22/10, Tony Duell <ard at p850ug1.demon.co.uk> wrote: I built that kit, c. 1990. There were two PCBs - the one I remember had a line of SOT-23 LEDs and an LM339 in an SO package. There were a couple of machined pin socket pins for inputs - you could insert an electret microphone to turn the board into an audio level display, or replace the microphone with an LDR to display light levels. The louder or brighter the room, the taller the line of lit LEDs. The only through-hole parts were the input pins and the CR2032 holder. Everything was SO and SOT-23 and 1206 sized. At the time I did it, it was challenging to me, but at least it worked the first time. Since then, with practice, 1206 and SO stuff is old hat, and I work down to 0.5mm QFPs and 805s with no difficulty (IOB6120, Makerbot Sanguino and Arduino boards, Makerbot wristwatch, stepper controllers, etc). Even though I'm over 40, I still have steady hands and good close-in vision. I wouldn't hesitate to do most SMT short of BGAs. I'm keeping my eyes out for a 20X-25X binocular dissection microscope for the day when I can't see so well. Until then, I'll just keep at it like I have been. It may be inexpensive to get "kits" pre-soldered overseas, but I don't mind the work, and I've seen more than a few hobby-level products with low yields due to poor construction. If I build it myself, I know it's good. -ethan