bride of zen

renjiish · 16th September 2004, 07:59 PM

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

eLarson · 16th September 2004, 09:07 PM

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

commstech · 17th September 2004, 06:54 PM

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.

Davey · 17th September 2004, 07:01 PM

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.

PMA · 17th September 2004, 07:33 PM

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.

Davey · 17th September 2004, 07:57 PM

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.

Nelson Pass · 17th September 2004, 11:59 PM

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.

renjiish · 18th September 2004, 05:32 PM

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

16th September 2004, 07:59 PM	#1
renjiish diyAudio Member Join Date: Aug 2002 Location: United Kingdom	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

16th September 2004, 09:07 PM	#2
eLarson diyAudio Member Join Date: Aug 2002 Location: Gaithersburg, MD	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 __________________ Would a woodchuck bother to chuck MDF?

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17th September 2004, 07:01 PM	#4
Davey diyAudio Member Join Date: Dec 2001 Location: Bremerton, WA.	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.

17th September 2004, 07:33 PM	#5
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	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.

17th September 2004, 07:57 PM	#6
Davey diyAudio Member Join Date: Dec 2001 Location: Bremerton, WA.	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.

17th September 2004, 11:59 PM	#7
Nelson Pass The one and only Join Date: Mar 2001	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.

18th September 2004, 05:32 PM	#8
renjiish diyAudio Member Join Date: Aug 2002 Location: United Kingdom	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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