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Old 11-16-2010, 10:59 PM
captofchaos captofchaos is offline
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Default The Airchime Organ

Hi All,
I found the holy grail, for powering devices up to 3amps continous with a MD24. They are industrial input /output solid state relays, used in process control applications. They have built in LED's and fuses and they are photoptically isolated. They are expensive new, but readily availible used and surplus on ebay. It seams that OPTO22 is the originator of these, but there are many copies. Anyhow they take a 5volt signal and switch a 3 amp load, AC and DC types available. The cool thing is racks are available that hold 24 relays. With a little hacking these match up nice with the MD24. Kinda like a MSA-P on steroids.

The Hack required is that these are set up to be controlled by a current sinking logic source meaning you switch the 5VDC negative lead, The MD-24 is a sourcing supply. So basicly you have to switch the polarity on the card, by cutting the common positive trace, tieing all the negatives together, then supplying the positive side of the relay sockets from the MD-24, hence the wires soldered to the back of the card.
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This will be on the next addition to The Great American Horn Machine
DANA

Last edited by captofchaos; 10-15-2011 at 09:43 AM. Reason: more info added
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Old 11-20-2010, 03:10 PM
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Hey Dana, this looks like a great idea. What keywords would one use to search for this type of thing on eBay?
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Old 12-01-2010, 10:00 PM
wabbitguy wabbitguy is offline
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Quote:
Originally Posted by John View Post
Hey Dana, this looks like a great idea. What keywords would one use to search for this type of thing on eBay?
For starters try Opto22.

Mel
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Old 12-23-2010, 11:44 AM
captofchaos captofchaos is offline
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Default Airchime Organ

Here is my "complete" MD-24 project, A rack, Manifold, MIDI setup for 18 chromatic Nathan Airchime K series train air horns. Designed to be mounted on my rig or as a stand alone instrument.


MD-24 > 5vdc output > OPTO 22 solid state photo isolated relays> 12vdc solenoid valves 2amps+/- each> 100PSI air> air horns

The horns are away being tuned, not a simple process, It requires a machine shop with custom tooling and lots of experience.
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Old 12-24-2010, 05:24 PM
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Dana, thank you for posting--I can't wait to see (& hear!) this thing in action. Merry Christmas.
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Old 09-11-2011, 11:30 PM
captofchaos captofchaos is offline
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Default The Airchime Organ

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Old 09-21-2011, 09:04 PM
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Dana, the airchimes sound (and look) great! The pitch is very accurate.
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Old 10-15-2011, 09:46 AM
captofchaos captofchaos is offline
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Default Pittsburgh Mini Maker Faire

Hey All,
Check out the Airchime Organ at the Pittsburgh Mini Maker Faire.

http://pghmakerfaire.com/

DANA
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