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Old 16th May 2013, 04:09 AM   #271
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Quote:
Originally Posted by AndrewT View Post
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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Last edited by availlyrics; 16th May 2013 at 04:15 AM.
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Old 7th June 2013, 10:33 PM   #272
prezden is offline prezden  Canada
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Default 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
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Old 8th June 2013, 04:15 AM   #273
JMFahey is offline JMFahey  Argentina
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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.
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Old 8th June 2013, 10:33 AM   #274
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Quote:
Originally Posted by prezden View Post
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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Last edited by danielwritesbac; 8th June 2013 at 10:41 AM.
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Old 8th June 2013, 05:44 PM   #275
prezden is offline prezden  Canada
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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
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Old 8th June 2013, 05:58 PM   #276
gootee is offline gootee  United States
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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 06:04 PM.
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Old 8th June 2013, 06:03 PM   #277
prezden is offline prezden  Canada
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Yes- 9.56 kOhms- thanks gootee
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Old 10th June 2013, 01:48 AM   #278
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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.
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Old 6th July 2013, 10:31 AM   #279
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Default 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
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Old 7th July 2013, 01:40 PM   #280
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ups my mistake i got the wrong r .. this keen eyes ..problem solved.
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