power supply question

thetube0a3 · 29th January 2010, 04:13 PM

Hey, Have a quick question about using switching supplies with a TD7265 amp.

Where I work we carry many desktop bricks that range from 12v, 15v, and 19v. Usually with current ratings of 3 to 5A. Im thinking about using 1 or 2 bricks to power the amp depending on If i bridge or not.

The supplies we have have excellent regulation and fairly clean outputs. Any opinions on how this will perform??

I'm building the amp to power speakers on my desk at work. typical power will not exceed 1-5W.

thetube0a3 · 29th January 2010, 04:59 PM

Also wondering if anyone has tried running these chips in parallel to drive a 4 ohm load at 19-20V. I'm looking into using these chips as a friend has them and the boards.

The speakers I want to drive are a pair of A/D/S/ L300E's which are 4 ohm.

AndrewT · 30th January 2010, 11:03 AM

Hi,
most of the chipamps run from dual polarity supplies.
You will need two laptop PSUs. Your 19Vdc becomes +-19Vdc and is sometimes referred to in the data sheet by it's total rail to rail voltage of 38Vdc in some design examples.

thetube0a3 · 30th January 2010, 01:51 PM

AndrewT : I decided to go with LM3886's anyway. I'll be ordering a nice 250va 18+18 transformer to go with it soon. I'm sure it'll drive the 4 ohm load better then the TD7265's. And i'm familiar with the 3886's.

Unfortunately its not as convenient as the twin power bricks, but most likely a whole lot better in the end.

29th January 2010, 04:13 PM	#1
thetube0a3 diyAudio Member Join Date: May 2008	power supply question Hey, Have a quick question about using switching supplies with a TD7265 amp. Where I work we carry many desktop bricks that range from 12v, 15v, and 19v. Usually with current ratings of 3 to 5A. Im thinking about using 1 or 2 bricks to power the amp depending on If i bridge or not. The supplies we have have excellent regulation and fairly clean outputs. Any opinions on how this will perform?? I'm building the amp to power speakers on my desk at work. typical power will not exceed 1-5W.

30th January 2010, 11:03 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, most of the chipamps run from dual polarity supplies. You will need two laptop PSUs. Your 19Vdc becomes +-19Vdc and is sometimes referred to in the data sheet by it's total rail to rail voltage of 38Vdc in some design examples. __________________ regards Andrew T.

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29th January 2010, 04:59 PM	#2
thetube0a3 diyAudio Member Join Date: May 2008	Also wondering if anyone has tried running these chips in parallel to drive a 4 ohm load at 19-20V. I'm looking into using these chips as a friend has them and the boards. The speakers I want to drive are a pair of A/D/S/ L300E's which are 4 ohm.

30th January 2010, 01:51 PM	#4
thetube0a3 diyAudio Member Join Date: May 2008	AndrewT : I decided to go with LM3886's anyway. I'll be ordering a nice 250va 18+18 transformer to go with it soon. I'm sure it'll drive the 4 ohm load better then the TD7265's. And i'm familiar with the 3886's. Unfortunately its not as convenient as the twin power bricks, but most likely a whole lot better in the end.

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