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Relay-based projects

A list of projects where the relays are doing some kind of processing or computing - i.e. something more than just switching a load.

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If you're into relay logic then you probably already know about many of these projects - but hopefully some are new to you and can give you additional insights and ideas for your own projects.

Hackaday relay projects

YGREC16 - YG's 16bits Relay Electronic Computer
https://hackaday.io/project/18757
(superseded by #YGREC-РЭС15-bis)

SPDT16: 16-bits arithmetic unit with relays
hackaday.io/project/10889
(superseded by the above project)
SPDT16
Kalin-Burkhart Logical Truth Calculator
hackaday.io/project/7871 (project vanished ?)
4 bit relay adder
hackaday.io/project/3802
RISC Relay CPU
hackaday.io/project/11012
Simple Relay ALU
https://hackaday.io/project/162246-simple-relay-alu
Relay Puzzle Box
hackaday.io/project/2075

Swifty's Relay Clock Project
https://hackaday.io/project/55956
 
Relay Logic Clock
hackaday.io/project/8683
Relay Computer
hackaday.io/project/10303
RelayRepRap
https://hackaday.io/project/11914-relayreprap
Brainfuck relay computer
https://hackaday.io/project/18599-brainfuck-relay-computer


4 bit relay adder
https://hackaday.io/project/3802-4-bit-relay-adder
4-bit Relay ALU (РЦВМ-1)
https://hackaday.io/project/159308-4-bit-relay-alu-1

Relay projects on other sites

Harry Porter's Relay Computer
web.cecs.pdx.edu/~harry/Relay
(see the video )
i² (i Squared
isquared.weebly.com
Basic relay computer
electronixandmore.com/projects/relaycomputer
Relay Computer Two
electronixandmore.com/projects/relaycomputertwo
RC-3
computerculture.org/projects/rc3
Zusie
www.nablaman.com/relay
Mercia
relaiscomputer.nl

Relay calculator
simonwinder.com/projects/relay-calculating-engine
Paul Laws's Relay Computer
relaycomputer.blogspot.my

Clicks
clicksrelaycpu.blogspot.my
A fistful of relays
github.com/Dovgalyuk/Relay/wiki/Build-log
Radiolok
rln.nnov.ru/index.php
github.com/radiolok/RelayComputer2
tqfp.org/radiolok/releynaya-evm-versiya-2-releynaya-logika-alu
TIM series
northdownfarm.co.uk/rory/tim
Duo 14 Premium
ostracodfiles.com/ostracod/relay.html
R500/7T
strangecalc.ch
Simon relay processor
cs.ubc.ca/~hilpert/e/simon
Relay Trainer
relaysbc.sourceforge.net
Relaiscomputer
relaiscomputer.de/pr.htm

Relaisrechner
schlaefendorf.de/relaisrechner/dokumentation
4-Bit Relay Adder
brainlubeonline.com/relaycomputer/RelayFramer.html
Neodem ALU/Computer
neodem.com/.../relay-computer
TD4 with relays
http://www.geocities.jp/team_zero_three/TD4/

Inspirational relay projects

Pongmechanik
cyberniklas.de/pongmechanik

Software for relay projects

TOFU Circuit Simulator
meatfighter.com/tofu
Relayser - Relay logic simulator
github.com/SmallRoomLabs/Relayser

Youtube:


Relay theory & general info

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Yann Guidon / YGDES wrote 11/11/2018 at 01:52 point

https://www.youtube.com/watch?v=BE2F9dvAI-Q

just a flip-flop turned into a frequency divider :-D

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roelh wrote 11/10/2018 at 20:30 point

For simulating your relay project, I recommend the Falstad simulator: http://www.falstad.com/circuit/

The relays can be selected in the "Draw" menu under "Passive components".

An example of using the Falstad simulator for relays can be found in my Simple Relay ALU project, https://hackaday.io/project/162246-simple-relay-alu (Scroll to the end of the Details section).

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Yann Guidon / YGDES wrote 11/11/2018 at 00:38 point

ah the memories... *pun*
https://hackaday.io/project/20864-ygrec-15-bis/log/58292-i-can-see-now
I used falstad to test my DRAM array and its excellence was challenged by my naughty circuit :-P But yeah it's a cool and useful tool :-)

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roelh wrote 11/08/2018 at 18:40 point

The simplest Relay ALU ever ! Only 2 DPDT relays (or 3 SPDT relays) and a few diodes provide 10 functions, including shift-right. See https://hackaday.io/project/162246-simple-relay-alu !

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Yann Guidon / YGDES wrote 08/21/2018 at 18:10 point

More old relays !
The ARC is a pioneering electromechanical automatic calculator designed by the Booth spouses in UK.
http://www.chilton-computing.org.uk/acl/literature/manuals/cambridge/p005.htm
First use of a drum high-speed magnetic memory, first electromechanical and fast computer with 20 bits of fixed points, addition in 1/50th of a second... Very interesting :-)

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Yann Guidon / YGDES wrote 05/04/2018 at 17:45 point

Yet more relays, for beginners : https://en.wikipedia.org/wiki/Minivac_601

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Yann Guidon / YGDES wrote 05/04/2018 at 17:48 point

With the associated HaD rebuild : #HOMEBREW MINIVAC 601 COMPUTER 

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Mark wrote 03/29/2017 at 00:17 point

I'd like to be on the list.  Relays are a big part of the games I've built with retired electromechanical pinball machine parts.  Thanks.    funwithpinball.com/games

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Yann Guidon / YGDES wrote 03/29/2017 at 00:23 point

Welcome here !

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will.stevens wrote 03/24/2017 at 22:36 point

Hi, thanks for this great resource, please could you add my project. It's about making the relays from scratch, and then using the relays to make control circuitry:

https://hackaday.io/project/11914-relayreprap

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Yann Guidon / YGDES wrote 03/25/2017 at 01:53 point

Sure ! Thanks for the notice !

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Dave Gönner wrote 05/21/2016 at 16:38 point

Can we include this one as well?

http://www.cyberniklas.de/pongmechanik/indexen.html

It's a mechanical implementation of  Pong, with relays for the game logic

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matseng wrote 05/22/2016 at 02:47 point

Thanks. I added it in its own section "Inspirational projects" since there was no real technical info like diagrams/schematics and such about the projects, just a BOM.

Still it's a very cool project that I'd love to clone some day - just as I like to build this awesome (non-relay) based mechanical Lunar Lander game some day as well.  http://lushprojects.com/lunarlander/

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Yann Guidon / YGDES wrote 05/21/2016 at 14:34 point

Where did you find the background/avatar picture ? I don't remember this one.

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matseng wrote 05/21/2016 at 14:50 point

I cheated there a bit. I couldn't find a nice clear picture of an real old relay computer so I took some random picture from an old thelephone exchange instead :) 
http://www.bayern-online.com/v2261/artikel.cfm/203/Kennziffernspeicher.html

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Yann Guidon / YGDES wrote 05/21/2016 at 14:53 point

relays are also used to control machinery such as elevators :-)

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Dave Gönner wrote 05/21/2016 at 14:06 point

Thank you for adding me to this project, I'm honoured to be in such great company. These are all fantastic projects! I hope we can come up with innovative ways of using relays, or at least inspire a relay revival.

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matseng wrote 05/21/2016 at 15:40 point

Hopefully it can and will. Or at least we will have use of the collection of projects :-)

I think your project is the most artfully laid out project in the list - especially for being bare pcbs. And also probably is one of the most useful of them as well...

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Dave Gönner wrote 05/21/2016 at 16:36 point

Thank you, that is a great compliment. I try to do my best. Functionality and visual appearance are both key considerations. 

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Yann Guidon / YGDES wrote 05/21/2016 at 12:50 point

Thanks for adding me, Mats, now it's your turn to show us what you can do with relays ;-)

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matseng wrote 05/21/2016 at 13:17 point

Still living without hardware :-(  That's why I'm currently hacking away at the last entry in the list - the Relayser.  When it's a bit more ready I can at least dry-run design a system while waiting for getting my stuff out of storage and shipped to a new place. But that is minimum two months away.

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