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How to silence an EL Wire AC Inverter?
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Re: How to silence an EL Wire AC Inverter?

by John_NY on Wed Jan 05, 2011 8:55 pm

I'll have to wait a bit before I post any pictures -- my EL Inverter from Adafruit is in transit, as is the 9V slide-switch inverter. I'll try to remember to update the thread when they arrive (probably < 5 days). It might be OBE, now that I see westfw's schematic.

-John
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Re: How to silence an EL Wire AC Inverter?

by stinkbutt on Thu Jan 06, 2011 11:47 am

There are a slew of boost controller IC's that can handle this as well. As for the inverter bit, well, once you've dispensed with the microcontroller in favor of a boost IC, you might as well go old school and just use a 555.
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Re: How to silence an EL Wire AC Inverter?

by paulharmo on Tue Aug 30, 2011 7:36 pm

Sorry to revive this thread, but does anyone have any more insight on this project? Are there purchasable inverters that don't squeal like a stuck pig, or is this purely a homebrew project? I'd like to try to silence one of the "adafruit" style inverters, but I'm worried that that may not do the trick. I'm going to have to either have the inverter running basically next to my ear, or *possibly* massively extend the cable to fit in a backpack or something of that sort. If I went that far, though, I'd be making a custom enclosure/battery setup for the lot. I'd prefer to use 12v in that case.

-Paul
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Re: How to silence an EL Wire AC Inverter?

by adafruit on Tue Aug 30, 2011 7:47 pm

paulharmo wrote:Sorry to revive this thread, but does anyone have any more insight on this project? Are there purchasable inverters that don't squeal like a stuck pig, or is this purely a homebrew project? I'd like to try to silence one of the "adafruit" style inverters, but I'm worried that that may not do the trick. I'm going to have to either have the inverter running basically next to my ear, or *possibly* massively extend the cable to fit in a backpack or something of that sort. If I went that far, though, I'd be making a custom enclosure/battery setup for the lot. I'd prefer to use 12v in that case.
-Paul


hi paul,

we believe these are the best high-quality inverters that are available - we sampled all the ones that were out there and chose the ones we did after careful testing.

you're welcome to purchase one and return it within 14 days if this is a concern.

cheers,
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Re: How to silence an EL Wire AC Inverter?

by paulharmo on Tue Aug 30, 2011 10:32 pm

Thanks for the quick reply!

My friend has 3 inverters of the exact same design you guys sell, and I agree, they are of high quality. However I'm looking for an inverter that will run on a 12v system. Is there a simple modification that can be done to the PCB to make it run on 12v?

-P
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Re: How to silence an EL Wire AC Inverter?

by adafruit on Tue Aug 30, 2011 10:52 pm

paulharmo wrote:Is there a simple modification that can be done to the PCB to make it run on 12v?


no, but we will have a 12v inverter in the store either this week or early next week :)

cheers,
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Re: How to silence an EL Wire AC Inverter?

by GranitePenguin on Mon Sep 12, 2011 1:10 pm

I finally got around to soldering my EL wire starter kit (yes, it's a pre-already-connected kit). I love the look of it, but wasn't quite prepared for the whining sound. In the description of the kit, it's mentioned that foam tape is included (which it is) to place inside to dampen the noise.

Where, exactly, are you expected to insert the foam tape? Inside the battery case(which doesn't make a lot of sense) or inside the components area (since that is where the noise comes from)?

If you put it inside the electronics compartment, there isn't a lot of room. Plus, is it safe to cram foam into the compartment (any heat issues)?

Thanks.
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Re: How to silence an EL Wire AC Inverter?

by adafruit_support_bill on Mon Sep 12, 2011 1:46 pm

These don't run very hot so there is no real heat issue. The compressed foam will help damp the vibration from the components.
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Re: How to silence an EL Wire AC Inverter?

by GranitePenguin on Mon Sep 12, 2011 2:49 pm

Thanks.

I crammed the foam into every spare space I could find, and it doesn't seem to be helping much at all. :-(

On the plus side, it dissipates with distance pretty quickly.

Is the whine just something that you basically have to live with when dealing with EL ?
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Re: How to silence an EL Wire AC Inverter?

by adafruit on Mon Sep 12, 2011 3:33 pm

yes
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Re: How to silence an EL Wire AC Inverter?

by rwinscot on Thu Aug 02, 2012 2:24 am

With the space available in that pocket inverter... you may have to "deal with the squeal." Do you think you could make a little more space for say... a sound cancellation circuit?

The whine is, for the most part, consistent which means that the same sound - broadcast out of phase from within the enclosure should make for a significant reduction of whine for your passers-by.

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Re: How to silence an EL Wire AC Inverter?

by adafruit on Thu Aug 02, 2012 9:22 pm

rwinscot, sound cancellation doesn't really work that way. the best solution is to pad the circuit - every EL inverter we have ever seen makes a noise
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Re: How to silence an EL Wire AC Inverter?

by W9TIM on Tue Mar 12, 2013 1:08 pm

I noticed that the IOS flowing wire EL enhanced USB adapter is silent! in contrast to the other inverters. - is it just the low power draw that keeps it quiet or does this product have a secret to keeping it from squealing?
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Re: How to silence an EL Wire AC Inverter?

by strawberry on Wed Jun 26, 2013 11:09 pm

anyone having any luck? I have an EL Wire from GloFX ( http://officialglofx.com/everything-led/el-wire/ ). Its the sound activated one, and the buzz isn't terrible but you can hear it. I am planning to try using some cooling cloth with tape around it.
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Re: How to silence an EL Wire AC Inverter?

by firedingo on Tue Dec 09, 2014 11:03 am

what about using a sound deadening material like dynamat?

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