volume pot

william1981 · 25th February 2007, 12:29 PM

Hi all
I have recently bought my self a 250w monoblock amp (kit) if assembled her and have a bit of a problem with the volume pot when it is turn all the way down it is still pretty loud it is a standard 100 log pot the right side comes from the rca input and the middle to the amp, and the right is open have I missed something.
At this stage im not using a preamp and the pot is the only way for me to put it softer

One other question I would like to put fuses on my crossover how will I determine the size of them?

Thanks
William

analog_sa · 25th February 2007, 01:59 PM

Your pot is wired wrongly. Input should go to one end, the other end grounded and the wiper to amp input.

myhrrhleine · 25th February 2007, 06:25 PM

Quote:

One other question I would like to put fuses on my crossover how will I determine the size of them?

Thanks
William

P=I^2R Amperage * Amperage * resistance = power
Determine the power desired and the speaker impedance.
Plug in the formula values.
Choose the next larger size fuse to allow for peaks in the current.

AndrewT · 25th February 2007, 08:02 PM

Hi,
don't fuse the speaker. It does not sound nice.

Instead fuse the supply rails after the main smoothing bank.

CBS240 · 25th February 2007, 09:01 PM

The volume pot should act as a variable voltage divider between input and signal GND, as described by analog_sa

Gordy · 25th February 2007, 11:31 PM

For information on wiring your pot have a look here:
http://www.diystompboxes.com/wiki/in...e=DIY_FAQ#POTS

Regarding fusing: follow the advice of AndrewT. Fuse each power rail. Place the fuse after the main (large) smoothing capacitors and before the amplifier output devices.

25th February 2007, 12:29 PM	#1
william1981 diyAudio Member Join Date: Nov 2004 Location: gauteng	volume pot Hi all I have recently bought my self a 250w monoblock amp (kit) if assembled her and have a bit of a problem with the volume pot when it is turn all the way down it is still pretty loud it is a standard 100 log pot the right side comes from the rca input and the middle to the amp, and the right is open have I missed something. At this stage im not using a preamp and the pot is the only way for me to put it softer One other question I would like to put fuses on my crossover how will I determine the size of them? Thanks William

25th February 2007, 08:02 PM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, don't fuse the speaker. It does not sound nice. Instead fuse the supply rails after the main smoothing bank. __________________ regards Andrew T.

25th February 2007, 09:01 PM	#5
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	The volume pot should act as a variable voltage divider between input and signal GND, as described by analog_sa __________________ All the trouble I've ever been in started out as fun......

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25th February 2007, 01:59 PM	#2
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	Your pot is wired wrongly. Input should go to one end, the other end grounded and the wiper to amp input.

25th February 2007, 11:31 PM	#6
Gordy diyAudio Member Join Date: Nov 2006	For information on wiring your pot have a look here: http://www.diystompboxes.com/wiki/in...e=DIY_FAQ#POTS Regarding fusing: follow the advice of AndrewT. Fuse each power rail. Place the fuse after the main (large) smoothing capacitors and before the amplifier output devices.

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