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Old 11th March 2013, 06:26 AM   #1
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Default Drive channel inverted- How is this done right?

How does one invert the signal going to one channel of a half-bridge stereo class D amplifier? I have not turned up an answer with extensive searching.

The amps inputs are unbalanced RCA connectors, the amp's input impedance is about 15,000 ohms. (iraudamp7 knockoff)

Simply swapping the positive and ground wires of one channel would short the input?
Is there an off-the-shelf board or box that could do a phase shift of 180, and still match the qualities of the other channel?
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Old 11th March 2013, 11:51 AM   #2
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Bridging Adapter For Power Amps
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Old 11th March 2013, 10:46 PM   #3
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Default Bridging module

Is a bridging module an off the shelf board? Is this a similar circuit to an inverting operational amplifier?
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Old 12th March 2013, 12:28 AM   #4
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Yeah I guess something like the Autotek MLX100 would get the job done if you don't want to DIY.
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Old 12th March 2013, 02:14 AM   #5
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If there was a single channel inverter op-amp kit, I'd give the soldering a good try.
Seems there is no shortage of chips, but the soldering is at surgical scale and not beginner's level. Ive soldered 22 gauge cat5 strands, and fried the copper.

That car audio bridging module does the 180 phase shift, but kinda overkill for a single channel inversion to cancel power bus pumping. So many channels.

My head hurts after reading there are inverter op amp for specific frequency ranges, which means I had better understand the Iraudamp7 documentation before messing with inversion.
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Old 12th March 2013, 02:29 AM   #6
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The op-amp circuit from the link provided will do 20Hz-20kHz no problem. Not sure where you got the frequency specific thing from.

Is this for home or car use?
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Old 12th March 2013, 03:35 AM   #7
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Oh, it's an irs2092 stereo amp for home, running a symmetric 60v power supply from Connex. Its not my first build, but its the first with these sort of complexities.
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Old 12th March 2013, 04:43 AM   #8
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Quote:
Originally Posted by AmpedOut View Post
Oh, it's an irs2092 stereo amp for home, running a symmetric 60v power supply from Connex. Its not my first build, but its the first with these sort of complexities.
This one does the job Connexelectronic

Cheers ,

Rens
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Old 12th March 2013, 04:48 AM   #9
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^ There you go... looks like the perfect option. You don't even need a separate supply for it.
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Old 12th March 2013, 05:45 AM   #10
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Default Could it be done with transformers?

I've pondered whether the desired function could be achieved using a pair of 1:1 audio isolation transformers: connect the two transformer primary windings in parallel to the source signal, and the secondary windings go to respective amplifier inputs; just connect one of them in opposite phase to the other.
I'd be happy to hear from anyone that has done this, and/or any drawbacks to this idea. (Frankly, it seems too simple - what am I missing?)
Thanks!
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