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 Chip Amps Amplifiers based on integrated circuits

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availlyrics
diyAudio Member

Join Date: May 2011
Quote:
 Originally Posted by AndrewT Then call it average power.
On a lighter note

Amplifier Power Ratings

A hilarious way to "mathematically derive" PC spk PMPO ratings.
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Thanks,
availlyrics

Last edited by availlyrics; 16th May 2013 at 05:15 AM.

prezden
diyAudio Member

Join Date: Nov 2008
Pot Confusion

Hi Guys-
Could someone kindly tell how to wire this pot to the board. I have looked at every diagram I can find and can't find anything with a 5 wire pot and 2 wire board.

Thanks
Attached Images
 pot.jpg (485.6 KB, 545 views)

 8th June 2013, 05:15 AM #273 JMFahey   diyAudio Member     Join Date: Mar 2009 Location: Buenos Aires - Argentina To me it looks like a regular 3 leg pot (front section) and a regular 2 leg switch (back section). 1) does it click if you reach "0" or push/pull the shaft? and/or: 2) do you measure the pot's resistance across the 3 front legs and 0/infinite across the back ones? Please post results.
danielwritesbac
diyAudio Member

Join Date: Nov 2007
Quote:
 Originally Posted by prezden Hi Guys- Could someone kindly tell how to wire this pot to the board. I have looked at every diagram I can find and can't find anything with a 5 wire pot and 2 wire board. Thanks
I think it goes like this:
The back row of 2 contacts are probably a light current on/off switch that you don't need for this project. The front row of 3 contacts are input, output, ground. If you get that sequence mixed up, trying to turn the volume down actually turns it up instead, but except for that possible surprise, it is fairly straightforward. Here's Rod Elliot on the topic: Potentiometers (Beginners' Guide to Pots)
P.S.
One of the links in my signature line below, could have found that information for you, very quickly.
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DIY Models & AppsClipNipperLM1875TDA7293Powerful Parallel TDA7293 kit ♦ My post has opinion.

Last edited by danielwritesbac; 8th June 2013 at 11:41 AM.

 8th June 2013, 06:44 PM #275 prezden   diyAudio Member   Join Date: Nov 2008 Thanks guys The resistance on the 3 terminals side is 0-9.56. I wasn't sure whether I needed the on-off terminals. Does the ground just go to the enclosure? cheers- prez
 8th June 2013, 06:58 PM #276 gootee   diyAudio Member   Join Date: Nov 2006 Location: Indiana Hopefully it's 9.56 kOhms (i.e. 9560 Ohms), not 9.56 Ohms. Where the "ground" connects is probably quite important. It will probably connect to the signal input ground, not the enclosure. Think about the path that the current would have to take. It has to flow in a loop, and always will. You never want it to have to "take the long way home". Last edited by gootee; 8th June 2013 at 07:04 PM.
 8th June 2013, 07:03 PM #277 prezden   diyAudio Member   Join Date: Nov 2008 Yes- 9.56 kOhms- thanks gootee
 10th June 2013, 02:48 AM #278 danielwritesbac   diyAudio Member     Join Date: Nov 2007 3 pins: The ground of that pot goes to the ground of the RCA jack, AND to the 0v, audio ground at the amplifier board. Middle pin goes to amplifier board signal in+, probably your input cap. And, the remaining pin goes to the + of the RCA jack. __________________ ♦ DIY Models & Apps ♦ ClipNipper ♦ LM1875 ♦ TDA7293 ♦ Powerful Parallel TDA7293 kit ♦ My post has opinion.
 6th July 2013, 11:31 AM #279 servoG diyAudio Member   Join Date: Jun 2013 hum I build an amp of lm1875 as datasheet ... and at the first time played well,.. but then after a few minute, there's a hum.. please someone let me know, why this is happen.. Thanks
 7th July 2013, 02:40 PM #280 servoG diyAudio Member   Join Date: Jun 2013 ups my mistake i got the wrong r .. this keen eyes ..problem solved.

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