New Sonic Impact T Amp board

dpuopolo · 29th July 2007, 12:37 AM

I just got another T Amp and its circuit board has been redesigned. The layout is different. Fortunately, it's now even easier to replace the input caps.

Here's how to do it (I'm assuming the unit is powered down).

1. Turn the volume control all the way up.

2. Run an ohm meter from each channels' input to the coupling caps to find them. They are two small monolythic caps right on the back edge of the circuit board on its top (the board is turned upside down in the unit). You'll know you've got the right cap(s) when you see 0 ohms on your ohm meter on one side of each cap.

3. Remove these caps and solder two 4 inch wires to their connecting terminals. Run these wires on top, as the hole where the wires hang down is occupied by the volume control when the cabinet is put together. I used Cat 5 stranded wire, but wire wrap wire (available at Radio Shack) will also work. This wire has to be THIN (26 guage or smaller).

4. Make up a composite cap by putting two of these caps in parallel (per channel of course):

http://www.radioshack.com/product/in...entPage=family

http://www.radioshack.com/product/in...entPage=family

Solder the wires from the old caps to these, and mount these caps to the back of the battery compartments with some tape or glue.

The result will blow you away at how good it sounds. And, even better, it's CHEAP! You can do this mod. for around five bucks.

atleer · 1st August 2007, 07:12 PM

Will this hold true for any new T-amps purchased? I'm awaiting mine just ordered from partsexpess

mustik · 4th August 2007, 08:21 AM

I purchased two SI t-amps less than two weeks ago. The board is "REV.D". Dpuopolo, I assume you also have this board?

dpuopolo · 10th August 2007, 04:45 AM

That is the board I have....

mustik · 10th August 2007, 10:53 AM

Quote:

Originally posted by dpuopolo
That is the board I have....

So.. as following your instructions seems a little complicated (due to my incompetence), if I post a photo of both sides of the board, could you make a drawing on top of that ?
It'll probably take few days, since my digital camera is broken.

atleer · 10th August 2007, 02:14 PM

i'd be interested in seeing any pics or schematics as well.

Thanks

lineup · 26th May 2008, 12:59 AM

Quote:

Originally posted by dpuopolo
That is the board I have....

Quote:

Originally posted by atleer
i'd be interested in seeing any pics or schematics as well.

Thanks

Mee too!
Let's see some more, please.

Thanks, Lineup

29th July 2007, 12:37 AM	#1
dpuopolo diyAudio Member Join Date: Jul 2007	New Sonic Impact T Amp board I just got another T Amp and its circuit board has been redesigned. The layout is different. Fortunately, it's now even easier to replace the input caps. Here's how to do it (I'm assuming the unit is powered down). 1. Turn the volume control all the way up. 2. Run an ohm meter from each channels' input to the coupling caps to find them. They are two small monolythic caps right on the back edge of the circuit board on its top (the board is turned upside down in the unit). You'll know you've got the right cap(s) when you see 0 ohms on your ohm meter on one side of each cap. 3. Remove these caps and solder two 4 inch wires to their connecting terminals. Run these wires on top, as the hole where the wires hang down is occupied by the volume control when the cabinet is put together. I used Cat 5 stranded wire, but wire wrap wire (available at Radio Shack) will also work. This wire has to be THIN (26 guage or smaller). 4. Make up a composite cap by putting two of these caps in parallel (per channel of course): http://www.radioshack.com/product/in...entPage=family http://www.radioshack.com/product/in...entPage=family Solder the wires from the old caps to these, and mount these caps to the back of the battery compartments with some tape or glue. The result will blow you away at how good it sounds. And, even better, it's CHEAP! You can do this mod. for around five bucks.

10th August 2007, 04:45 AM	#4
dpuopolo diyAudio Member Join Date: Jul 2007	Yes That is the board I have....

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1st August 2007, 07:12 PM	#2
atleer diyAudio Member Join Date: Aug 2007	Will this hold true for any new T-amps purchased? I'm awaiting mine just ordered from partsexpess

4th August 2007, 08:21 AM	#3
mustik diyAudio Member Join Date: Aug 2007	I purchased two SI t-amps less than two weeks ago. The board is "REV.D". Dpuopolo, I assume you also have this board?

10th August 2007, 02:14 PM	#6
atleer diyAudio Member Join Date: Aug 2007	i'd be interested in seeing any pics or schematics as well. Thanks