4780 component placement

asc · 26th July 2005, 04:08 PM

Hello. I'm building a 4780 kit from chipamp.com (Thanks Brian).

First off, I think that I have the correct placement for all the parts except for the Rm. There are two patches of exposed metal on the bottom of the board which seem to be attached to the correct pins on the 4780. Is that the correct placement for this resistor?

Is there any more detailed info on the 4780 somewhere here? I could not locate it after several searches?

-ASC

Vikash · 26th July 2005, 04:10 PM

yes, that patch underneath if for the feedback resistor..

asc · 26th July 2005, 06:58 PM

Not the Feedback resistor. The mute resistor for the 4780. That's what the pins look like. As far as I can tell, the 4780 board is based off the parallel schematic from the 4780 data sheet. Since the board is not labeled for placement of Rm, a 10K resistor, I started tracing pins on the 4780 and it appears the metal spaces connect to pins 14,20 (Mute) and 10,11 (Vee).

My question is, are you actually supposed to mount the resistor to the bottom of the board?

-ASC

Russ White · 26th July 2005, 11:18 PM

Yes, it goes on the bottom of the board.

I hated that part. A SMD resistor is great there.

I drilled two small holes to help me mount mine.

Cheers!
Russ

26th July 2005, 04:08 PM	#1
asc diyAudio Member Join Date: Jul 2005 Location: Portland, OR	4780 component placement Hello. I'm building a 4780 kit from chipamp.com (Thanks Brian). First off, I think that I have the correct placement for all the parts except for the Rm. There are two patches of exposed metal on the bottom of the board which seem to be attached to the correct pins on the 4780. Is that the correct placement for this resistor? Is there any more detailed info on the 4780 somewhere here? I could not locate it after several searches? -ASC

26th July 2005, 04:10 PM	#2
Vikash diyAudio Moderator Emeritus Join Date: May 2003 Location: UK	yes, that patch underneath if for the feedback resistor.. __________________ "The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)

26th July 2005, 11:18 PM	#4
Russ White diyAudio Member Join Date: Jan 2005 Location: Nashville, TN, USA	Yes, it goes on the bottom of the board. I hated that part. A SMD resistor is great there. I drilled two small holes to help me mount mine. Cheers! Russ __________________ Less pulp more juice Twisted Pear Audio.

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26th July 2005, 06:58 PM	#3
asc diyAudio Member Join Date: Jul 2005 Location: Portland, OR	Not the Feedback resistor. The mute resistor for the 4780. That's what the pins look like. As far as I can tell, the 4780 board is based off the parallel schematic from the 4780 data sheet. Since the board is not labeled for placement of Rm, a 10K resistor, I started tracing pins on the 4780 and it appears the metal spaces connect to pins 14,20 (Mute) and 10,11 (Vee). My question is, are you actually supposed to mount the resistor to the bottom of the board? -ASC

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