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#21 | |
diyAudio Member
Join Date: Jul 2019
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Quote:
I imagine I could create the following: http://www.ti.com/tool/PMP10088 and use a step up converter to achieve the desired +/-18V |
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#22 | |
diyAudio Member
Join Date: Jul 2019
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Quote:
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#23 | |
diyAudio Member
Join Date: Nov 2019
Location: Niagara Region Ontario
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Quote:
I just know you're going to hate me for this but... I would be concerned with phase issues and gain mismatches between the separate filters used on the hot and cold differential signals. It seems to me it would make more sense to convert to a single ended signal, or if there is a low risk of common mode noise, to simply ignore one phase of the differential signals. Especially considering that TPA3116 chips use single ended inputs, this would cut your design complexity right in half as you would only need one high pass and one low pass filter for each channel. The first thumbnail is a simplified flow chart. The second shows a simple XLR (balanced) Receiver and Transmitter. You would most likely only need the receiver part. In the spice screenshot, the top graph shows a differential input with considerable common mode noise, the middle graph shows how it's all cleaned up by the XLR Receiver, the bottom graph shows a nice clean differential output. Last edited by Douglas Blake; 17th November 2019 at 04:47 PM. |
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#24 | |
diyAudio Member
Join Date: Jul 2003
Location: Newcastle, Australia
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Quote:
There's an alternative to using a DC supply if you want to use a wall wart (plug pack). An AC wall wart can supply split rail DC using 317/337 or 78xx/79xx if you read the ESP P05 articles. P05-Mini
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If there are no dogs in Heaven, then when I die I want to go where they went - Will Rogers Last edited by rabbitz; 18th November 2019 at 01:22 PM. |
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#25 | |
diyAudio Member
Join Date: May 2002
Location: Westende Resort, BE coast
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Quote:
Jan
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Cable: a potential source of trouble interconnecting two other potential sources of trouble - Erik Margan Linear Audio articles - SilentSwitcher - Treg high voltage regulator - High-voltage delay unit |
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#26 | |
diyAudio Member
Join Date: Jul 2019
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Quote:
I would have hoped with the circuitry being identical there shouldn't be issues with phase shifts and differences in gain providing resistors are properly matched. I will look into it further though. |
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#27 |
diyAudio Member
Join Date: Jul 2019
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Looks really cool but I'm making my own board which has lithium ion charging, amplifiers, active crossover, and BT module all in one. This would cause me to have a second external board.
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#28 | |
diyAudio Member
Join Date: Nov 2019
Location: Niagara Region Ontario
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Quote:
In a project where (from what I gather) I'm building a bi-amped bluetooth system that will most likely be all in one box, running from a single power supply, I would bypass the differential signals entirely since common mode noise is very unlikely in that environment. I would grab one side of the differential outputs on the bluetooth module, use RCA jacks for any additional inputs and build the crossover and amp as a single ended device. Now, if we were talking about separate devices, located some distance apart and interconnected by cabling, I might see more value in differential signalling, for it's noise rejection. In any case, I was just looking over your schematic and old school me noticed a lot of duplicated effort and thought I should mention it. Best of luck with your project... |
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