Old kit identification?? - Page 1
Forum section: electronics / projects

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: October 24, 2015, 05:41:07 am
content: So i got a few boxes of cool vintage stuff from a friend. One of them was filled with alot of old 1% resistors and oil caps etc... all pretty good quality brands and accuracys. Rumaging through all the bags i found thisIt appears to be an old kit of some kind it almost looks like it should be mostly deadbug constructed, considering lack of holes.... This is a wild shot in the dark but does this PCB look falmiar to any old timers? I goglogled the number on the board but found no results.... if anyone knows where you can find old kig info, or any of the pcb looks familiar any info would be appreciated. Im sure i will never get an answer to this but its really bugging me!

author: crispy_tofu
author_rank: Super Contributor
timestamp: October 24, 2015, 08:53:07 am
content: I can't help, but I can help the people who do - in case anybody else can't see the photo:EDIT: now my one doesn't work :DD

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: October 24, 2015, 09:11:06 am
content: sorry about that I wrote it on my phone im not sure what went wrong with the link....

author: Ian.M
author_rank: Super Contributor
timestamp: October 24, 2015, 09:34:06 am
content: Two transistors, two caps and five or six resistors would be a pretty boring kit. Its not got any small caps so its highly unlikely to be a RF circuit. There is a footprint for one of the transistors on the PCB but not for two. Its also got an unusual set of mounting holes.My money is on it being a mod board + component kit to either repair or enhance some other bit of equipment.

author: G7PSK
author_rank: Super Contributor
timestamp: October 24, 2015, 09:58:13 am
content: I can see where two transistors would fit, my guess is is it is a pre amp of some sorts. What are the transistor types.

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: October 24, 2015, 07:05:26 pm
content: Ya it doesnt look like it would do anything standalone my guess was an amp or some sort of module too. It came from a box of old ham stuff variable air caps, inductors, and a bunch of junk too. I will open the bag and list out all parts in a bit

author: Gall
author_rank: Frequent Contributor
timestamp: October 24, 2015, 11:48:40 pm
content: May it be that the kit may be assembled in two variants? I.e., an npn amp or a pnp amp at your choice? This would explain why there are more parts than holes.I've seen such kits in USSR, a board and a set of parts with more than one possible circuit.

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: October 25, 2015, 02:57:50 am
content: 2x 2N3703 transistors2x Ceramic Disc 2nf1x PaperWax .022mfd1x Metal Oil (I think) 47uF2x Fairchild 333 diodes? .66v dropassorted resistors a few look to be 1/2 watt

author: Ian.M
author_rank: Super Contributor
timestamp: October 25, 2015, 03:29:45 am
content: So I was wrong about the kit not having small caps. Does either the waxed paper cap or the (probable) electrolytic (47uF) have a date code?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 25, 2015, 06:01:14 am
content: Seems like an astable multivibrator to me. Think I'd want to turn it over in my hand to decide where everything goes. Doesn't look like there's an output, or LEDs, so dunno?Tim

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: October 25, 2015, 06:57:23 am
content: The measured and verified metal axial 47 uf cap is +35v stamped 7433h, in not sure if thats a date code, not to clear on how to read those always. The paper caps says wmf 1s22, dont think thats a date code but its the only thing on it that I dont know what it means. The pcb has 24 holes while there is 38 leads on all components.

author: JoeO
author_rank: Frequent Contributor
timestamp: October 25, 2015, 08:21:34 am
content: A coil short of a metal detector?

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: October 25, 2015, 04:36:07 pm
content: Kinda sucks I found this randomly these small transistors are a buck a piece I tried looking up circuits there used in with out a lot of luck. Im not to interested in slapping it together I just want to know what it is. I think the two transistors themselves were a good score.

author: Ian.M
author_rank: Super Contributor
timestamp: October 25, 2015, 07:35:38 pm
content: I still think its to modify something. The odd 'windows' in the ground plane are probably for clearance from parts on whatever board its designed to mount to. I'd read that date code as 1974 week 33, so its likely to be about 40 years old.

author: Kalvin
author_rank: Super Contributor
timestamp: October 25, 2015, 07:44:19 pm
content: 2N3703 $0.30/ea. But of course those might have vintage value.