Print Page - Run Pork Barrel @ 12v-have to re-bias?

Title: Run Pork Barrel @ 12v-have to re-bias?
Post by: blearyeyes on May 03, 2016, 03:44:37 PM

If your planning on running a Pork Barrel @ 12v should you re-bias the circuit @ 12v?
Looks like you should in my limited knowledge.

http://www.madbeanpedals.com/projects/PorkBarrel/PorkBarrel_2015.pdf

Title: Re: Run Pork Barrel @ 12v-have to re-bias?
Post by: madbean on May 03, 2016, 03:49:51 PM

Nope!

Title: Re: Run Pork Barrel @ 12v-have to re-bias?
Post by: blearyeyes on May 03, 2016, 07:01:42 PM

So why doesn't increasing the input voltage to the power section increase the bias and mess with the chorusing you set using the 10k trimmer?

Title: Re: Run Pork Barrel @ 12v-have to re-bias?
Post by: madbean on May 03, 2016, 08:50:06 PM

I'm sorry - what I thought you were asking was if any resistor values around the clock needed to be changed (I forgot about the trimmer.)

You might need to make a slight adjustment to the trimmer or it may be fine as is. IIRC when I last tried 9v vs. 12v I did little or no adjustment. The trimmer adjusts the bias voltage for overall headroom whereas the clock is modulated by the LFO.

Here is a really good link for circuit analysis:http://www.electrosmash.com/boss-ce-2-analysis (http://www.electrosmash.com/boss-ce-2-analysis)

Title: Re: Run Pork Barrel @ 12v-have to re-bias?
Post by: blearyeyes on May 04, 2016, 03:39:34 AM

Thanks!

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Projects => General Questions => Topic started by: blearyeyes on May 03, 2016, 03:44:37 PM