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Old 16th September 2004, 07:59 PM   #1
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Default bride of zen

sir
i completed my bride of zen last week.i have one problem.i was not able to get 5k output pot.i got one alps blue 100k linear pot.can i convert this linear pot to log pot according to Mr.Leach.
since i am from a rural area in india,it is very difficult to get some kind of quality specific parts.
so please help me
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Old 16th September 2004, 09:07 PM   #2
eLarson is offline eLarson  United States
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I'm not entirely familiar with the conversion technique, so I can't be sure what sort of resistance you will get at any given setting.

You might be better off using it at the input of the preamp, instead of at the output.

Erik
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Old 17th September 2004, 06:54 PM   #3
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Quote:
Originally posted by eLarson

You might be better off using it at the input of the preamp, instead of at the output.

Erik
yes, that is what i did, but not because i cannot find a 5k pot. I used 100k pot at the input because i am getting way too much gain at the output.
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Old 17th September 2004, 07:01 PM   #4
Davey is online now Davey  United States
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You can "taper" a linear pot into a pseudo audio taper by adding a resistor from the wiper output to ground. Here's a good reference: (Look toward the bottom.)

http://sound.westhost.com/pots.htm

Davey.
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Old 17th September 2004, 07:33 PM   #5
PMA is offline PMA  Europe
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The reference is good, but it is quite a hard job to convert 100k lin pot into 5k log pot. The values differ too much.
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Old 17th September 2004, 07:57 PM   #6
Davey is online now Davey  United States
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Yes, you are correct, but it's not critical that the volume control be exactly 5k, and it will still be better than a 100k linear taper pot by itself.
Also, he didn't mention the amplifier input impedance. That will also factor into the equation.

Cheers,

Davey.
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Old 17th September 2004, 11:59 PM   #7
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I would try a 10K to ground off the wiper. This way the output
impedance will never exceed about 6 K ohms, even if it does
make it a little touchy at the top.
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Old 18th September 2004, 05:32 PM   #8
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i used 16 k to ground off the wiper.i used it in the input.i used a 5k fixed resistor on the output,ie,after the 10 uf.now it is working fine with my power follower 99.
is there any problem keeping it like this.please advise
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