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Building How-to » Misc How-to » controlling output level
controlling output level [message #2271] Mon, 15 June 2009 18:51 Go to next message
jeffreysquared is currently offline jeffreysquared
Messages: 8
Registered: March 2009
i've modded a boss pedal and the output level rises incredibly when the mod is engaged. is there anything i can do to keep the volume level stable so i don't have to fear blowing out my speakers (and eardrums), and keep the pedal in the instruments' signal path?

[Updated on: Tue, 24 August 2010 14:23]

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Re: controlling output level [message #2274] Mon, 22 June 2009 20:20 Go to previous messageGo to next message
jeffreysquared is currently offline jeffreysquared
Messages: 8
Registered: March 2009
are there no forum masters to help me in my troubles?
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Re: controlling output level [message #2280] Wed, 24 June 2009 07:43 Go to previous messageGo to next message
Remork is currently offline Remork
Messages: 25
Registered: May 2009
Junior Member
depends on how you did the mod? if it's mounted on a simple switch, you could do it on a switch with an extra pole instead, and use that to switch in an extra resistor on the output.

gimme gimme gimme
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Re: controlling output level [message #2285] Fri, 26 June 2009 04:48 Go to previous messageGo to next message
dann is currently offline dann
Messages: 772
Registered: December 2002
Location: Austin TX
Senior Member
What, you don't want your amp to catch on fire? Wink
Put a 47k between the circuit and output jack. That will limit the current enough, it won't hurt anything.
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Re: controlling output level [message #2303] Thu, 03 September 2009 18:38 Go to previous messageGo to next message
jeffreysquared is currently offline jeffreysquared
Messages: 8
Registered: March 2009
oh man! i can't believe the system didn't let me know i got a response! I'll try that immediately, thanks remork and dann.

i'll make sure to post the results.
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Re: controlling output level [message #2310] Tue, 22 September 2009 23:47 Go to previous messageGo to next message
jeffreysquared is currently offline jeffreysquared
Messages: 8
Registered: March 2009
Hey guys, i think i messed up on this mod. dann, was i supposed to put in a 47 ohm resistor between the circuit and output jack?
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Re: controlling output level [message #2311] Thu, 24 September 2009 10:43 Go to previous messageGo to next message
dann is currently offline dann
Messages: 772
Registered: December 2002
Location: Austin TX
Senior Member
47k ohm (not 47 ohm). Just a value to start with. Or like remork says, put it on a switch if there is one.

you might also have to put a resistor to ground on the output jack, start with 47k.
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Re: controlling output level [message #2541] Fri, 06 August 2010 11:46 Go to previous messageGo to next message
jeffreysquared is currently offline jeffreysquared
Messages: 8
Registered: March 2009
hey guys, picking up on this, i'm thinking of putting a 50k pot between the circuit and the output to control the volume more accurately, my quetion is whether it should be linear or audio? http://www.radioshack.com/product/index.jsp?productId=206235 5

or should i just go with a 100K Dual-Ganged Stereo Volume Control? http://www.radioshack.com/product/index.jsp?productId=206235 9
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Re: controlling output level [message #2552] Mon, 16 August 2010 14:43 Go to previous message
dann is currently offline dann
Messages: 772
Registered: December 2002
Location: Austin TX
Senior Member
Short answer: any 100k pot will work, so get what's convenient and try it! Even better is to get a variety of pots and try them all. It's always nice to have some extra pots around for other projects anyways


Longer answer: Audio pot is best if it's wired with one lug to ground and the center lug going to the output (and the remaining lug going to the output of the circuit board). This is called a voltage divider wiring.
If you're wiring it with just two lugs (one going to the output of the circuit and one going to the output jack or bypass), then linear might be better, but really it will depend on impedance issues so you might find the audio taper will work better.
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