Enough relays? - Page 1
Forum section: electronics / projects

author: Alex
author_rank: Regular Contributor
timestamp: June 27, 2013, 06:43:42 pm
content: Scored these today, about 120 -150 relays, these are all I could fit in the picture!They come on DIN rail support carriers, flyback protected, with LED indicators and terminal blocks.The relays are 24V coil SPDT mains, 20A 250 V AC cotacts.What to do?!!...

author: bilko
author_rank: Frequent Contributor
timestamp: June 27, 2013, 06:46:21 pm
content: You can start by testing them

author: Alex
author_rank: Regular Contributor
timestamp: June 27, 2013, 06:48:31 pm
content: Click click click...Yup.

author: SeanB
author_rank: Super Contributor
timestamp: June 27, 2013, 07:02:25 pm
content: I could have done with a dozen last month, went out and bought them.

author: bilko
author_rank: Frequent Contributor
timestamp: June 27, 2013, 07:06:43 pm
content: We used to use similar boards as breakout boards for CNC/PLC controllers. I'm sure that either the CNC guys or the Arduino guys would be interested

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: June 27, 2013, 07:31:17 pm
content: Connect them all up so that when one closes, it turns the next one on. Should make a satisfying zzzzzzzip sound when the first one is turned on.Maybe figure out how to connect them in a ring so you get a continuous wave of relayness going round and round.

author: Unknown
author_rank: Unknown
timestamp: June 27, 2013, 07:39:12 pm
content: Wire them all as buzzers and annoy the living CRAP out of anyone you live with.

author: bilko
author_rank: Frequent Contributor
timestamp: June 27, 2013, 07:41:36 pm
content: Connect the normally closed contact of the last relay to power the coil of the first relay. The rest of the relays, connect the normally open contact to power the next coil in sequence. When the last coil energises it will de-energise the first coil and the rest of the chain, when the last relay is de-energised, the cycle will repeat, I think

author: Unknown
author_rank: Unknown
timestamp: June 27, 2013, 07:42:42 pm
content: If you do that, put it on youtube. I bet you get quite a few hits.

author: bilko
author_rank: Frequent Contributor
timestamp: June 27, 2013, 07:49:34 pm
content: Add some caps in strategic positions in the sequence (for delays) to play a rhythm

author: Thor-Arne
author_rank: Unknown
timestamp: June 27, 2013, 07:55:44 pm
content: Relay computer ?

author: Smokey
author_rank: Super Contributor
timestamp: June 27, 2013, 07:59:43 pm
content: OMG you beat me by 30 seconds!!!!http://web.cecs.pdx.edu/~harry/Relay/

author: bilko
author_rank: Frequent Contributor
timestamp: June 27, 2013, 08:03:16 pm
content: Quote from: Smokey on June 27, 2013, 07:59:43 pmNice, I notice he has the computer behind glass, to keep the bugs out?

author: Thor-Arne
author_rank: Unknown
timestamp: June 27, 2013, 08:09:11 pm
content: There'sthislittle one too.

author: Alex
author_rank: Regular Contributor
timestamp: June 27, 2013, 08:56:50 pm
content: Quote from: mikeselectricstuff on June 27, 2013, 07:31:17 pm'Ring' oscillator proper?With taps for variable output frequency?Quick measurement, the energisation time is about 10 ms for these relays. In a chain of 100 we can have a 1 to 100 Hz output pulse frequency and a bbbzzzz at 100 Hz when its running.I can place 3 relays in a circumference of 4-5 cm. So the oscillator will have a total circumference of 130 - 160 cm and a diameter of 40 - 50 cm.Over voltage the coils, take the covers off and put the whole thing in a glass box with argon?Quote from: duskglow on June 27, 2013, 07:39:12 pmThe 100-relay doorbell from hell?Quote from: bilko on June 27, 2013, 07:49:34 pmDo you think I have enough relays?Quote from: Thor-Arne on June 27, 2013, 07:55:44 pmI was unable to find find any condensed time packs or flux caps in the box with the relays...SorryAlex.

author: Alex
author_rank: Regular Contributor
timestamp: June 27, 2013, 09:49:33 pm
content: Quick check of duskglow's idea of making a big buzzer.Two boards for 32 relays total all wired in parallel. One extra relay is wired as an astable multivibrator powering the relay banks.It makes its presence known, but it's not as loud as a doorbell, even if it had 100 relays. It would be louder with mechanical amplification or getting it to switch at a lower frequency.

author: bilko
author_rank: Frequent Contributor
timestamp: June 27, 2013, 09:54:49 pm
content: If you want it to be loud, you need to be using 100A contactors

author: Unknown
author_rank: Unknown
timestamp: June 27, 2013, 09:55:36 pm
content: Or you could put it on a sounding board, which is a piece of wood that's designed to vibrate freely, like on a piano.

author: Alex
author_rank: Regular Contributor
timestamp: July 08, 2013, 05:51:50 pm
content: Anybody got any use for these relay host boards? Loads of screw terminals and relay sockets. I believe I have a few more.Only P&P to anywhere or free local collection around Chester, UK. It's you or the bin, first come first served, hurry!Alex.