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Old 21st January 2012, 06:27 PM   #1
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Default Record Amp High Level out to Computer

Hello,

I have a Mesa Dual Rectifier 100W head that I would like to record from. I live in a house with others and would like it to be relatively silent when doing so. I bought a 16 Ohm, 100W resistor online to dissipate the power of the head, and I was hoping that I could use the signal across the 100Ohm resistor to record into my computer. See the picture below. The 32K and 100 Ohm resistors have a power rating of 1/4 or 1/2 W. I would just hook this up and find out if it works, but amps and computers are are expensive. Is there any reason why this would not work?

I am using the 16 Ohm output on my amp and using an audio jack and 14 AWG wire to connect the jack to the resistors. My other idea was to use a transformer, but this seems easier (I already have all the parts).

Thank you,
Chet

The peak power is shown for the 16, 100, and 32K resistors are shown in the picture below. (In that order)
Click the image to open in full size.
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Old 21st January 2012, 06:51 PM   #2
jjman is offline jjman  United States
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You could add an output control by using a 100 ohm pot instead of the resistor. Same location but take the output to the recorder from the wiper. You need to know the expected voltage of the output which is hopefully 0.4969 after doing the math on the mw figure. They make "attenuators" that have a silent mode and line-level outputs. You are essentially building one that has only silent mode. Sometimes caps are added to adjust frequency results. I have a cheap passive "DI" the provides a line out like this but no attenuation or silent mode regarding main speaker volume. It bypasses some highs to ground but also has a transformer before it's line out. I've read that your approach can sound off regarding EQ but may as well try it raw as a starting point.

Make sure your amp is seeing proper load of course, which the schematic is providing.

Last edited by jjman; 21st January 2012 at 06:55 PM.
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Old 21st January 2012, 06:56 PM   #3
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I was thinking the same thing with the pot. I will look into the attenuator though, thank you!
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Old 22nd January 2012, 12:03 AM   #4
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You may want to plug your amp and the computer in the same power bar. You do not want to get a ground loop going between them.
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