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Old 15th February 2006, 04:06 PM   #1
pendrgn is offline pendrgn  United States
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Default Color Organ input question

Hello,
I am the sound room engeneer for my church. We are planning on having a dance sometime near easter for hte youth. I wanted to have some fancier lighting, so I went online and did a search for color orgains, and light organs. I found a kit that was resonably priced, and purchased it. It works great in testing, but I have a problem when it comes to connecting it to teh church amp. My church's amp puts out 30watts to the speakers on its lowest setting, and can be turned up to 300 watts on the highest setting. The problem I have is the color organ can only accept a maximum input of 2 watts from the sound source. It then has a 120V ac input, and puts out 200 watts max per channel, on three channels. Is there a way to reduce the signal from the church's amp(probably for the purpose of the dance it will be set at about the half way point which would be around 150watts) down to the 2 watts maximum sound input. Please let me know if anyone can help.

thanks,

mike
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Old 16th February 2006, 07:14 AM   #2
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This can be done by the use of a voltage divider. That is a circuit consisting of two resistors. To be able to dimension it properly one has to know the input impedance of the circuit.

Regards

Charles
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Old 16th February 2006, 10:36 AM   #3
sreten is offline sreten  United Kingdom
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Hi,

Probably best to use a small mains transformer (for safety purposes).

Connect the amplifier to the mains side and the secondary to the CO.

The input to the CO is more likely 2V max, rather than 2W.

A small 115 VAC to 5 to 9 VAC transformer should do the job.

/sreten.
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Old 16th February 2006, 11:17 AM   #4
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2V input probably means it needs line level signals. Just plug it into a spare output on the desk, and forget about running it from the amp. You can test it by just plugging it into the output of a CD player.
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Old 16th February 2006, 02:53 PM   #5
dnsey is offline dnsey  United Kingdom
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Quote:
it will be set at about the half way point which would be around 150watts
Just to clarify, the acoustic 'half-way point' on a 300W amp won't be 150W (you'd hardly notice the difference), but more like 30W.

Is it a 100V line system? If so, you could just use a 2W speaker transformer to drive the organ.
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