MPS7720 DIP08 Chip - Page 3

mudihan · 8th July 2008, 06:29 AM

If I were to use only one board for two channels, what is the list for the mods? Many thanks!

mudihan · 8th July 2008, 07:03 AM

One more question: what does the 0.68uf cap do in the bridged version?

e_fortier · 9th July 2008, 02:01 AM

Hi,

This board already comes with 2 amplifier (single ended), the modifs shown above is to bridge both amp in order to get more power into 8 ohm but then it becomes a mono amplifier.

No mods required if you want to use these amp as stereo, except maybe for the output caps which are too small. Change C8 and C21 for 1000uF, 16V or 25Vdc. You don't need to de-solder them just push gently on the caps and they come right off.

The 0.68uF (I use a non pol. 1uF) is there to remove some high frequency from the output filter.

Hope this helps,
Eric

sled108 · 9th July 2008, 12:04 PM

What is the purpose of C3? I can't find it on the schematic, is it a common to both channels Tank Cap that can be Super-Sized?

mudihan · 9th July 2008, 05:02 PM

e_fortier:

Many thanks!

You mentioned earlier that the gains are set too low. What are the resistors that needed to changed for a higher gain in a bridged version? Thanks again!

perco · 25th July 2008, 03:32 PM

Is it possible to use the sure electronics board as headphone amplifier? Has anyone tried? Is it possible after bridging it?

How does it sound?

sled108 · 25th July 2008, 04:30 PM

It would be much more fun and easy to build or buy a Cmoy Mint Tin Amp such as this. You can also roll the chip with these to improve the sound according to you budget..Check E-Bay for Cmoy...

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8th July 2008, 06:29 AM	#21
mudihan diyAudio Member Join Date: Jan 2004 Location: Texas	If I were to use only one board for two channels, what is the list for the mods? Many thanks!

8th July 2008, 07:03 AM	#22
mudihan diyAudio Member Join Date: Jan 2004 Location: Texas	One more question: what does the 0.68uf cap do in the bridged version?

9th July 2008, 02:01 AM	#23
e_fortier diyAudio Member Join Date: May 2001 Location: Montreal	Hi, This board already comes with 2 amplifier (single ended), the modifs shown above is to bridge both amp in order to get more power into 8 ohm but then it becomes a mono amplifier. No mods required if you want to use these amp as stereo, except maybe for the output caps which are too small. Change C8 and C21 for 1000uF, 16V or 25Vdc. You don't need to de-solder them just push gently on the caps and they come right off. The 0.68uF (I use a non pol. 1uF) is there to remove some high frequency from the output filter. Hope this helps, Eric

9th July 2008, 12:04 PM	#24
sled108 diyAudio Member Join Date: May 2008 Location: Deep in the Heart of North Jersey	What is the purpose of C3? I can't find it on the schematic, is it a common to both channels Tank Cap that can be Super-Sized?

9th July 2008, 05:02 PM	#25
mudihan diyAudio Member Join Date: Jan 2004 Location: Texas	e_fortier: Many thanks! You mentioned earlier that the gains are set too low. What are the resistors that needed to changed for a higher gain in a bridged version? Thanks again!

25th July 2008, 03:32 PM	#26
perco diyAudio Member Join Date: Jul 2008	Is it possible to use the sure electronics board as headphone amplifier? Has anyone tried? Is it possible after bridging it? How does it sound?

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