Electronic gurus...main output pot on EQ...what resistance value?

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grweldon

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I got a great deal on a DOD 31 band EQ only to find the main output pot was bad and needs replacing. I've been able to find a direct replacement, but I don't know what resistance value to get because I can't measure the resistance of the messed up one. I have choices of 5K, 10K, 20K and 50K ohm. Anybody have any idea which one would be the best?

Thanks
 
How is the original messed up, so you can't measure the resistance? If the wiper is bad, you can still measure from the first to third pin. If the resistance is open, you can measure from the wiper to each side to get an idea.

Anyway, since line impedance is generally 600 ohms, I'd use the 5k pot if those are your choices. 1K might be better. Best would be to get a schematic and see what the part actually is.
 
Thanks guys, you have really helped.

The reason I wasn't getting a value between the first and third pin was because I had my meter set to the wrong range and it was showing 1. The value is actually 98.5 K and the number on the back is W100K.

Now, next question, I couldn't find a 100K pot in the configuration needed, so what will the effects of using a 50K be?

Obviously, you can tell I'm not an electronics tech...
 
grweldon said:
Thanks guys, you have really helped.

The reason I wasn't getting a value between the first and third pin was because I had my meter set to the wrong range and it was showing 1. The value is actually 98.5 K and the number on the back is W100K.

Now, next question, I couldn't find a 100K pot in the configuration needed, so what will the effects of using a 50K be?

Obviously, you can tell I'm not an electronics tech...
Click to expand...

Depends on what the pot is used for. My guess is you'll get less volume. You can always put a 50K resistor in series with the pot, but the downside is you won't be able to turn the volume all the way down.
 
reshp1 said:
Depends on what the pot is used for. My guess is you'll get less volume. You can always put a 50K resistor in series with the pot, but the downside is you won't be able to turn the volume all the way down.
Click to expand...

It depends on the circuit, but I'm guessing you wouldn't be able to turn the volume all the way up...
 
I'd use the correct value.

What's the configuration problem? Most can be worked around. I have replaced PCB mounted pots with regular ones by running short wires from the lugs to the circuit board, for instance.
 
MOFO Pro said:
It depends on the circuit, but I'm guessing you wouldn't be able to turn the volume all the way up...
Click to expand...

:D I guess it depends on if the resistor is on the ground side of the pot or on the signal side.
 
The pot is a surface mount type. I can't find the correct value in the proper configuration. The pot is the main output gain on a DOD 831 1/3 octave equalizer. I found the replacement part in the DigiKey catalog, but the largest resistance value was 50K.

On the up side, I still have the wiper plate from the old switch and I ordered a 5K, a 10K and a 20K besides the 50K that I was planning on using. Seems to me I could see if the wiper could be replaced, especially if the pots are constructed the same...

What do you think?
 
Find the next largest one and just not use it all the way, it sux but it will work
 
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