View unanswered posts | View active topics It is currently Wed May 24, 2017 7:42 pm



Reply to topic  [ 4 posts ] 
 OT: logic with homebrew diodes 
Author Message

Joined: Wed Jan 09, 2013 6:54 pm
Posts: 628
This fellow has been making his own diodes, and recently managed to construct a 7-segment decoder:
http://halestrom.net/darksleep/blog/026_diode_array/

Photos and video within, previous experiments nearby. The drawback is that it's a wet diode - perhaps not entirely unlike the inside of an electrolytic capacitor, based on aluminium and baking soda.

Quote:
I've made what I call "wet diodes" using aluminium foil, bicarb soda, water and a mostly unreactive metal (in this case: solder).

They're slow. They dry out. But they work, and you can make them at home.


Image

via hackaday


Sat Mar 11, 2017 12:43 pm
Profile

Joined: Tue Dec 11, 2012 8:03 am
Posts: 205
Location: California
Wow, that's dedication! When I was in junior high, I had visions of making my own transistors (for analog work). I think Jeri Elsworth has done that. The 4004 microprocessor was coming out about then, but it would be a few years before I would hear about a microprocessor for the first time, especially living in another country, and I was not interested in digital yet anyway.

_________________
http://WilsonMinesCo.com/ lots of 6502 resources


Sat Mar 11, 2017 7:40 pm
Profile WWW
User avatar

Joined: Tue Jan 15, 2013 5:43 am
Posts: 169
This unlikely diode reminds me of stories I've heard about people hearing faint radio reception from strange objects such as household plumbing or (IIRC) even their own teeth! :shock:

Of course a purpose-built radio receiver includes niceties such as tuned circuits. Parasitic receivers lack these, and consequently receive all stations at once (with the strongest signals most loudly audible). The heart of the circuit is the diode, which serves to demodulate the AM signal. This fellow's "wet diodes" give us some insight into how semiconductors can be created by accident.

-- Jeff

_________________
http://LaughtonElectronics.com


Sun Mar 12, 2017 12:41 am
Profile WWW

Joined: Tue Jan 15, 2013 10:11 am
Posts: 79
Location: Norway/Japan
Building your own semiconductors.. so, all won't be lost after the acopalypse! We don't have to resort to only abacuses, maybe. So, with sufficient knowledge about physics and principles it can be done from scratch. Keeping the memes around is important. I was reading up (again) on the first transistor the other day. Shockley may perhaps have received too much credit compared to the guys who did the actual work, but his great contribution was when he realized that you have to think about holes as particles in their own right, following the same laws. Not just as absence of electrons. With that insight, the rest followed.
Now we know all these things.. so in principle it should be possible to come up with something that works like diodes and transistors, even without the infrastructure we have today. Wet diodes.. I hadn't thought about that. Can he come up with a working transistor? Not yet, apparently. But maybe that's next.


Mon Mar 13, 2017 8:15 am
Profile
Display posts from previous:  Sort by  
Reply to topic   [ 4 posts ] 

Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group
Designed by ST Software