Early 2N2146 [ahh NOPE that's 2N4126] pnp, 1000s of the things... what to do? - Page 1
Forum section: electronics / projects

author: peteb2
author_rank: Regular Contributor
timestamp: September 25, 2019, 02:37:50 am
content: 2N2146.... So i've ended up with around 5000++2N4126 T0-92that've been stored in a burst baggy meaning their legs are a bit dirty needing a simple quick scrape prior to soldering etc....Ridiculous issue is that even though i've tried to pass out handfuls of the things free, everyone says; "oh pity they're pnp, there aint much yuh can do with 'em, no thanks"...So, here's a challenge: What's a circuit that'll consume as many as possible of the dang things as possible please? It just seems a terrible waste to just chuck them. They are annoyingly taking up valuable storage space though...

author: AngusBeef
author_rank: Regular Contributor
timestamp: September 25, 2019, 03:01:25 am
content: https://hackaday.com/2016/07/06/42300-transistor-megaprocessor-is-complete/

author: bob91343
author_rank: Super Contributor
timestamp: September 25, 2019, 04:14:41 am
content: I am in a similar boat with 1N4148 diodes. I must have thousands of them.Rated 1 A and 100 V, fairly fast.I also have bags of resistors that aren't what the color code indicates. Whether they are mislabeled or have drifted I don't know.

author: edavid
author_rank: Super Contributor
timestamp: September 25, 2019, 04:23:43 am
content: I don't think you mean 2N2146... that's a TO-3 transistor, so 5000 of them would require a really large bag.

author: james_s
author_rank: Super Contributor
timestamp: September 25, 2019, 04:27:05 am
content: Should be able to build just about anything you can build with NPN with PNP. If you have thousands of them it sounds like a discrete digital clock might be a good one.

author: tautech
author_rank: Super Contributor
timestamp: September 25, 2019, 05:21:56 am
content: Drop by for a coffee sometime Pete and I'll take a few hundred off you to spread around between mates.Maybe I can swap for a few things I have 1000's of ?Nuthing exciting only passives.

author: peteb2
author_rank: Regular Contributor
timestamp: September 25, 2019, 05:59:35 am
content: Quote from: james_s on September 25, 2019, 04:27:05 am....ooops massive dyslexia on the keyboard!!! What a clutz!!!(suitable edit done to my OP)....

author: edavid
author_rank: Super Contributor
timestamp: September 25, 2019, 03:04:06 pm
content: Quote from: bob91343 on September 25, 2019, 04:14:41 amJust so no one injures themselves, the actual spec is 75V, 200mA. Don't try to put 1A through a 1N4148.

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: September 25, 2019, 04:16:19 pm
content: Don't know how quiet they are. Maybe you could do a massively paralleled amplifier front end for low noise? Almost anything you can do with an NPN, you can do with a PNP.

author: tautech
author_rank: Super Contributor
timestamp: September 25, 2019, 08:16:34 pm
content: https://www.nteinc.com/specs/original/2N4125_26.pdf

author: amyk
author_rank: Super Contributor
timestamp: September 26, 2019, 02:02:34 am
content: Early DTL/RTL logic used exclusively PNP (and Germanium) transistors, 5000 is probably enough to build a simple 8-bit CPU.