Fostex Volume Control "PC1EX" - Schematic wanted - diyAudio
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Old 16th February 2012, 06:16 PM   #1
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Default Fostex Volume Control "PC1EX" - Schematic wanted

is the "PC1EX" only a potentiometer inbuild in an enclosure or is there also a buffer stage include?
here is the product sheet:
PC1EX | Volume Controller | Fostex
and high resolution image
http://www.fostexinternational.com/p.../PC1EX_Top.jpg
http://virgo-dragoon.blog.so-net.ne...._003-632f8.jpg
http://virgo-dragoon.blog.so-net.ne.jp/2011-04-25

Thank you for comments.

Last edited by tiefbassuebertr; 16th February 2012 at 06:20 PM.
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Old 16th February 2012, 08:11 PM   #2
PRR is offline PRR  United States
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No power supply, right?

10K pot in a box with jacks. $49 with cables! Sure, DIY it.
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Old 2nd July 2012, 01:49 PM   #3
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Hi
I'm going to make this myself !
What wattage would the piggy back pot' be /
The ones i've seen advertised are 0.1W
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Old 3rd July 2012, 08:04 PM   #4
PRR is offline PRR  United States
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> What wattage

Do math.

What's your signal voltage? 1V? 10V??

Voltage squared, divided by resistance, is Watts.

1V^2/10,000 = 0.000,1 Watts

10V^2/10,000 = 0.01 Watts

So a 0.000,1W part is probably OK, a 0.01W part is surely OK.

(Extra-OK because "1V signal" often means Peak, the average is lower, and something as big as a pot won't cook on a short audio peak.)

Since you can't buy less than 0.05W, it isn't important.
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Old 4th July 2012, 08:25 AM   #5
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Thanks
I'll have to see what sort of voltage is coming from the sound card
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Old 10th July 2012, 05:12 PM   #6
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It doesn't work !
I've just tried a 10K Alps pot in front of my Seiwin ST-6A active monitors.
The multi-meter says what you'd expect but the volume doesn't go down ?
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Old 12th July 2012, 04:43 PM   #7
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> It doesn't work !

I hate that phrase. It gives _NO_ useful information to aid debugging.

> The multi-meter says what you'd expect

What would _I_ expect? And what did you expect? Say what you got, not a reference to some one else's expectation.

Look at Beavis' page and try it his way.

Stereo Volume Controls

If you found a _stereo_ pot with all the pins in-line, the pinout is tricky. I can't find my sketch; and since these are very-low-cost (cheap) pots, I would suggest getting a more-normal (and perhaps better quality) 2-unit pot.
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Old 12th July 2012, 05:11 PM   #8
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Sorry!
I hadn't put the 2 pins down to the ground.
So it works fine now. Thanks for your help PRR
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