Re: Wattage Rating Of Pots Used In Volume Control

On Feb 15, 2:12 am, "Dave.H" <the19...@xxxxxxxxxxxxxx> wrote:
On Feb 15, 1:13 am, NoS...@xxxxxxxxxxx (Bob Masta) wrote:



On Thu, 14 Feb 2008 04:10:13 -0800 (PST), "Dave.H"

<the19...@xxxxxxxxxxxxxx> wrote:
I want to build I volume control for a battery powered amplifier I use
for my iPod, but I'm not sure what wattage value the pots have to be.
The amplifier outputs around 1 watt per channel.

The volume circuit I found was in a post on this newsgroup from 2001
by Beau Schwabe:

o------------->Right(+)
|
| o----o
+ | | |
Right(+)>----||----o----\/\/--o
100uF 1K Pot |
o-->GND
100uF 1K Pot |
Left(+)>----||----o----/\/\--o
+ | | |
| o----o
|
o------------->Left(+)

I plan on using two separate 1K pots, allowing me two adlust the left/
right channels separately, and the fact I can't get a dual pot of the
right value at *** Smith.

Do not use that circuit! Unless what I'm seeing is an ASCII art
translation artifact, it appears to have some serious problems.

A standard volume control has the input signal going to the top of the
pot (the contact that the wiper hits when the knob is fully
clockwise), and the output from the wiper. The other side of the pot
is grounded, the same ground for input and output signals.

I've done this just now with a 5K log pot I had on hand, and I have it
playing now. I know what to do now, thinking of sticking with 5K so I
can reuse this pot.

The only problem with the 10K pot (incorrectly called it a 5K pot
previously) is that the volume barely increases until the shaft's all
the way clockwise.
.