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The Magic Cafe Forum Index » » F/X » » Help me decide on an invertor? (0 Likes) Printer Friendly Version

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g0thike
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John,

You have to buy one of these:

http://www.theinverterstore.com/the-inve......?cat=DSW

You might find a better deal somewhere else, if you do let me know.

The other economic ones are Modifide Sine.

G0THIKE
g0thike
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Sine wave vs. modified square wave output...

Inverters are electronic devices that convert battery power into a form that mimics conventional grid power. Most models produce a modified square wave. This waveform allows home owners to run 98% of the typical loads in a house.

But switches, sensitive electronics occasionally some of these products will not work, or even fail, with modified square wave power. Some stereo equipment MAY have a slight hum or buzz with this type of inverter power.

Premium inverters produce a pure sine wave to imitate grid power. This eliminates background noise so that all electronics, work without problems. They are particularly suited for sensitive electronics found in some computers and higher quality sound equipment.

http://www.excessenergy.net/inverters.htm
Eldon
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I'm pretty sure my inverter is a modified sinewave. I have used it with Shure, Nady and Audio Technica wireless mic systems with no problems.
g0thike
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Eldon,

What brand and model do you have? I have 2 different ones and they both cause buzzing. I have a Shure wireless and Sennisher.

Your Invertor might have something special in it.

G0THIKE
Eldon
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My inverter is a "Portawattz Powerpac" made by Statpower Technoligies. Check out the link. http://www.baproducts.com/powerpac.htm
John C
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Quote:
On 2007-05-19 01:22, Eldon wrote:
My inverter is a "Portawattz Powerpac" made by Statpower Technoligies. Check out the link. http://www.baproducts.com/powerpac.htm


Looks good but it's discontinued ue to an upgrade. How long does this unit power your wireless mic?

So, this unit doesn't make a buzzing sound?

John
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sethb
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Looks like the safest option with electronic equipment is a "pure" sine wave or a digital sine wave inverter.

Here's the FAQ from the inverter website, with an explanation of the whole sine wave thing.

They do sell a relatively inexpensive ($99) pure sine wave 150-watt inverter that sounds like it might do the trick for a small sound system. Click HERE for more info. SETH
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Eldon
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I don't know how long my unit would power just a mic receiver. A really long time for sure. I have used it for two solid hours running two wireless mic systems and a Fender P-250 with no buzzing and still had plenty of charge left.
Fitz
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This may have bee covered already I read a few posts and jumped to the bottom. Find a battery store near you and take your unit in to them. I know many stores will set you up with a battery and the cables you would need to use them. Give it a shot...

Fitz
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TheAmbitiousCard
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Seth, that one you found looks like it might do the trick but how do you hook it up to a 12V battery???
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John C
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This may sound simplistic but it works!! I have a batter pack for my Virutal soundman. It consists of two 9 volt batteries with a DC connection on the end. I can plug this into my receiver for my Shure wireless mic setup. It powers it fine. I have had it running for OVER two hours.

I am going to bring it to a street magic GIG tonight. It's the simplest setup you could ever conceive.

John
The ULTIMATE Routine Series: rebirth soon!
sethb
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Frank -- good question! I was halfway to the answer, when I decided to go a different route and use a secondary internal battery instead (click HERE to see that solution).

But to make an external 12 volt DC battery connection, I believe you would need a DC/DC adapter that regulates the voltage. It would plug into the DC output connection on the external battery with a "cigarette lighter"-type connection, and to the DC input on the electronic device with a barrel (also called a coaxial) connection.

I found something for $33 that MIGHT do the job at Radio Shack, listed as part #273-1818, click HERE to view. The problem is that the device doesn't say exactly what amperage it can take. My PASO unit states that it draws 12 volts/4 amps, which is apparently quite a punch and about twice what most of these adapter devices can usually handle. I was going to research the issue further, but then went in a different direction, as noted above. Maybe other folks can chime in here with more information. SETH
"Watch the Professor!!" -- Al Flosso (1895-1976)
"The better you are, the closer they watch" -- Darwin Ortiz, STRONG MAGIC
Ashkenazi the Pretty Good
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I think I might go insane trying to find one tomorrow morning.

If I get stuck in the funny house, tell mom, OK?

She's in a REALLY small village with no electricity, but they get post every week or so.
------------

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Alan Munro
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Another option is to use a camcorder mike. I was told about a battery operated headset, wireless mike that has worked well for me so far, designed for karaoke machines - it's at Target. It's only $20 and I was pleasantly surprised how well it sounded. If you don't have the volume cranked too loud, you can just use the included cable, to avoid signal loss. With my Crate Limo amp, I wanted to run more volume and still stay close to the receiver, since the range is only 7 meters, so I used an impedence matching transformer and an XLR shielded cable.
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