Need an easy low power class D amp - Page 2

Peter Pan · 3rd January 2012, 03:34 PM

Back to my original request for a simple modular low power Class D amp. Can anyone recommend any other Class D amplifier modules in the 10-20 watt category? Now that I've found LIPO packs, I'm going to be using 12 volts and using a 4 ohm speaker, that should make it easier than my original 6 V requirement.

I did order some of those Y148 boards ELEVATOR recommended and they do work well, but they are pretty near impossible to modify. I need to increase the gain some and I'm sure those options are available, but I can't find ANY data on the chip itself or a board schematic. So I guess I'm looking for something small that ALSO provides some documented configuration options.

I know I'm being lazy not building my own board and such.

damarfi · 4th January 2012, 04:40 PM

download.yamaha.com/file/46252

Ipanema · 10th February 2012, 09:45 AM

Can anyone confirm that YDA148 is switching at 1MHz from the datasheet?

The board from dealextreme comes with ceramic input capacitor. You can replace it with film caps of 1uF but make sure that all 4 caps of the differential inputs are replaced, even if you're using single ended input.

Peter Pan · 10th February 2012, 01:56 PM

By the way, a little off topic now, but I was indeed able to modify the gain on these boards to the higher level, by removing one 0-ohm resistor and replacing it at a different position. In my originally intended application, to build an amplifier w/speaker and battery pack into a small travel guitar, this amplifier has exceeded all my wildest expectations, and sounds awesome. I think because the lowest note on a guitar is about 82Hz, there is no need for me to consider changing the capacitors. Thank God really! Its good to know it can be done to improve bass response, but my eyes and nerves are just not cut out for modifying components this small. ;-)

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3rd January 2012, 03:34 PM	#11
Peter Pan diyAudio Member Join Date: Feb 2010 Location: Tampa, Florida	Back to my original request for a simple modular low power Class D amp. Can anyone recommend any other Class D amplifier modules in the 10-20 watt category? Now that I've found LIPO packs, I'm going to be using 12 volts and using a 4 ohm speaker, that should make it easier than my original 6 V requirement. I did order some of those Y148 boards ELEVATOR recommended and they do work well, but they are pretty near impossible to modify. I need to increase the gain some and I'm sure those options are available, but I can't find ANY data on the chip itself or a board schematic. So I guess I'm looking for something small that ALSO provides some documented configuration options. I know I'm being lazy not building my own board and such.

4th January 2012, 04:40 PM	#12
damarfi diyAudio Member Join Date: Oct 2011 Location: Zagreb, Croatia	download.yamaha.com/file/46252

10th February 2012, 09:45 AM	#13
Ipanema diyAudio Member Join Date: Jun 2004 Location: KL	Can anyone confirm that YDA148 is switching at 1MHz from the datasheet? The board from dealextreme comes with ceramic input capacitor. You can replace it with film caps of 1uF but make sure that all 4 caps of the differential inputs are replaced, even if you're using single ended input.

10th February 2012, 01:56 PM	#14
Peter Pan diyAudio Member Join Date: Feb 2010 Location: Tampa, Florida	By the way, a little off topic now, but I was indeed able to modify the gain on these boards to the higher level, by removing one 0-ohm resistor and replacing it at a different position. In my originally intended application, to build an amplifier w/speaker and battery pack into a small travel guitar, this amplifier has exceeded all my wildest expectations, and sounds awesome. I think because the lowest note on a guitar is about 82Hz, there is no need for me to consider changing the capacitors. Thank God really! Its good to know it can be done to improve bass response, but my eyes and nerves are just not cut out for modifying components this small. ;-)

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