Sure TA2024 Power Line Mods II

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Albins suggestion basically is to separate the VDD1 and VDD2 power lines going into the Tripath TA2024. The VDD1 and VDD2 power lines power the left and right channels of the amplifier. The theory behind this I suppose is that by separating the power to each channel further up the power line means that each channel has its own independent bank of capacitance; demands on one power line have less effect on the other. Albin achieved this by cutting a trace on the Sure Tripath TA2024 amplifier PCB and soldering on some wire to directly connect the left and right power lines at the DC input to the module.

 

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I have to admit I was a little sceptical about this. The sure boards at first sight appear to have nice thick traces for the ground and power. Looking at the board; the power comes in through either the round DC plug, or through either of the +/- terminal blocks (top and bottom). The three power inputs are interconnected on the board. The power then makes its way through a Diode (D1). This diode is connected to the Left Channels bank of capacitors. It then is routed on the underside of the board. On the underside, it passes under the small bypass capacitors C9, C10, C18, C19 and to the right hand side of the board. Here it is routed to the topside where it feeds the Right Channels bank of capacitors.

 

Calling the banks of capacitors the "left channel and right channel capacitor banks" is not really fair. As the banks of {include_content_item 45}capacitors feed into a line that meets in the middle of the board, really both banks of capacitors feed into the left and right channels (VDD1 and VDD2) near enough equally. The proximity from the capacitors and each power in pin is almost equal. It's fairer to say that the two banks of capacitors are acting as one.

What Albin was suggesting was that you break the trace on the underside of the board, effectively you split the capacitor banks in half, and one half is now feeding VDD1 and the other VDD2. The power line is effectively being split at the input to the board. Albins suggestion also effectively bypasses the Diode labelled D1 on the board. As seen in my previous power line modifications this raises the voltage to the chip by 0.3V.

I had started to wonder if this raising of the voltage is what had improved Albin's perception of the sound. He had described his improvement as "as for the sound, to me it was like not working and working." I did know from my experience that bypassing the diode did make a difference to the sound.

Having a better look at the board, I got to thinking that Albin's modification could perhaps be improved on further. I decided that what I would do would be to separate the VDD1 and VDD2 power lines even further up the power line.

 

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Sure have thoughtfully provided two sets of terminal blocks. This allows you to connect power at either side of the board. Stock they are linked with a trace on the underside of the board. I decided to split this link as well and have two cables (one per channel) bring power into the board.

You can see in the picture how the powerlines are ow to be configured,  The banks of capacitors now each serve a channel of the amplifier.  The powerlines are seperate right up the line to the PSU.  Each channel of the amp now will work more indendantly than before and hopefully be cleaner for this.  Theroretically two power supply units could be used, one per channel.