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Old 31st May 2005, 08:38 PM   #1
P270 is offline P270  Greece
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Cool potentiometer pass aleph 1.7

Hi all

Any it knows sums k it should he is potentiometer for pass aleph 1.7 as me it informs (single function)

Thanks takis
:
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Old 31st May 2005, 10:45 PM   #2
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Are you asking for resistor values (switch) or potentiometer
values?
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Old 1st June 2005, 07:03 AM   #3
P270 is offline P270  Greece
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Cool potentiometer pass aleph 1.7

Hi mr Pass

I want to try also the two except and if potentiometers one from the two and something still IRF 9610 need heatsink

Best regards Takis
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Old 1st June 2005, 08:01 PM   #4
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I having a little problem deciphering the request, but here goes:

There a three places you can put variable resistance in an
Aleph P to alter the gain

1) You can place a dual potentiometer on the inputs as a
voltage divider. (dual pot required for 1 channel balanced)

A good value for this is 10K to 25K

2) You can place a single potentiometer between the Source
pins of the Mosfets, where a good value is about 1 Kohm.

3) You can place a dual potentiometer as a resistive load at
the outputs (again 1 dual for each channel) to load the
current-source output, and here a good value is about 1 Kohm.

And of course any of these pots can be replaced by rotary
switches and resistors (use make-before-break contacts) or
relays and resistors.

And yes, small heat sinks are a good idea.
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Old 2nd June 2005, 06:41 AM   #5
P270 is offline P270  Greece
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Default potentiometer

Hi mr Pass

Thanks for your help

takis
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Old 13th November 2005, 03:59 AM   #6
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So if I were to use the gain control between the source pins of the 610 Mosfets like the original Aleph p 1.7 then just what exactly would be the lowest resistor wattage needed?

I am planning on putting 20 100 ohm resistors in series for 20 gain settings with relays and a multi-position make before break switch to control them in place of the original potentiometer. I can see that there is not a significent dc difference however I am not sure about what the AC is at here.


I was looking at 1/10 watt dales, will these be enough to handle the power at this location?
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Old 13th November 2005, 09:52 AM   #7
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Hi,

putting 20 100 Ohm resistors in series will make a linear pot wich isnīt really suited for audio. Try something based on a log scale ( X dB per step).

william
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Old 16th November 2005, 05:28 AM   #8
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Ive got it!
How about I just use one of the original volume controls of the aleph P 1.7 for the 2k gain control! I would just have to take off the first two 8k and 4k resistors and replace them - on the other end - with 30.9 ohms and 15.48 ohms!
I think that this would work.
Then the only problem would be in making them make-before-break to avoid noise pops. I think that would be the ultimate though, 256 steps of precise gain adjustment.
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