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15v phantom power & undo channel inversion
15v phantom power & undo channel inversion
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Old 13th January 2011, 03:19 AM   #1
0ldSch00lf00l is offline 0ldSch00lf00l  United States
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Location: Lafayette, Louisiana
Default 15v phantom power & undo channel inversion

I've been having a mad scientist idea that I wanted to try, and I really want to try it even more after eating lunch with a friend last week.

How hard would it be to create a circuit that provides phantom power and reverse the channel inversion used to bridge old school Orion amplifiers through the DIN plug?

I ask because I have one of these negative feedback controllers:
Click the image to open in full size.

Click the image to open in full size.

And I've been wondering if I could adapt it to work with something other than the Orion 280GX that it was designed for.

Also, I believe this is the wiring spec for the MIDI/DIN plug:
Click the image to open in full size.

For some reason, I am thinking that 15v phantom power will be easier to achieve than reversing the channel inversion. I'm handy with a soldering iron, but circuit design is something I lack.
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Old 13th January 2011, 11:25 AM   #2
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
Unless this circuit modifies/distorts the signal, it's not likely to make a difference. All it can do is compensate for the effect that the speaker wire has on the signal. Unless you're using very small wire or have to run it a very long distance, this isn't likely to be beneficial.
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Old 24th March 2011, 05:57 PM   #3
troystg is offline troystg  United States
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That "circuit" is an electronic suspension system.. ie a servo. It contain an xo, bridging circuit, comparator circuit, loudspeaker modeling unit and signal modification circuit.

The bridge circuit in the negative feedback unit (NFU) can be defeated for an amp that has a built in bridging switch. The "issue" is to make a stand alone phantom power supply to provide > +/- 12 VDC to the NFU. As you can see in your picture that voltage is regulated down to +/- 8 VDC.
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