Print Page - Help with circuit analysis on Bumble Buzz

Title: Help with circuit analysis on Bumble Buzz
Post by: mikepurcell on March 25, 2021, 11:26:48 PM

(https://i.postimg.cc/K1128WDt/bumble-buzz-schematic.png) (https://postimg.cc/K1128WDt)

I've built this circuit and really like how it sounds but would like to tweak it a bit - I added a volume knob, replacing the 330k resistor with a 500k pot and I also added a sag pot on the +9v input, it seems to help with some of my low output guitars. I also added switchable input caps to roll off a little bottom on the input.

I'm looking to add a tone control and it seems like the network on the end (R16, R17, C7 & C8) make up the hp and lp filters on the output. Can anyone clarify the operation of this portion of the circuit?

If I wanted to add a rudimentary tone control, would it be as simple as subbing a 50k pot for R17?

Thanks

Title: Re: Help with circuit analysis on Bumble Buzz
Post by: andy-h-h on March 26, 2021, 02:50:23 AM

It's basically a trimmed back super fuzz. There's a lot of mods out there that you could test on the bridged t notch filter.

I couldn't get the link working - google mark hammer alternate fuzz tone control. You might find it interesting for this.

Pretty good thread right here too. https://www.diystompboxes.com/smfforum/index.php?topic=86199.0

Title: Re: Help with circuit analysis on Bumble Buzz
Post by: antonis on March 26, 2021, 08:04:23 AM

You can bring R17 down and turn it into a Tonestack..

(https://i.imgur.com/H8oKqko.png)

Title: Re: Help with circuit analysis on Bumble Buzz
Post by: mikepurcell on March 28, 2021, 10:54:14 PM

Thanks for the thread referral and the tonestack mod!

I'll give it a try.

DIYstompboxes.com

DIY Stompboxes => Building your own stompbox => Topic started by: mikepurcell on March 25, 2021, 11:26:48 PM