Soul Sonic - Hunny Bunny, sweet overdrive

earthtonesaudio · Post by **earthtonesaudio** » 21 Jan 2009, 13:38

So if you were to make R5 variable, for use as a high-cut filter, what value would you start with? 10k? 100k?

briggs · Post by **briggs** » 21 Jan 2009, 14:44

moltenmetalburn wrote:
Ok, the 10k and 2.2nF filter rolls of highs above 7234Hz, the 12k & 3.3nF filter rolls off at 4019Hz; Using the formula F= 1/(2Pi*R*C) with R in ohms and C in Farads. So the freqs above 7234Hz are rolled off at a 6dB knee (due to the overlap in filters) while those above 4019Hz are rolled off at a 3dB knee. Everything below 4019Hz runs through unaffected.......

Or that is how I calculate! And I'm just back from the pub
thanks for the great explanation, And for leading me here, it was you after all that introduced me to this site and I am completely addicted!

No thanks needed! I'm glad you enjoy everything FSB.org is! Great link there, I'll have to read it to get my understanding up to 100%. I'm still very much a hack at this!

soulsonic · Post by **soulsonic** » 21 Jan 2009, 23:07

earthtonesaudio wrote:So if you were to make R5 variable, for use as a high-cut filter, what value would you start with? 10k? 100k?

I would start with 100K... it will be much easier to hear what difference it may make by starting with a large value like that. But it might require a different MOSFET type to get the desired filtering effect... see Gus' post.

earthtonesaudio · Post by **earthtonesaudio** » 22 Jan 2009, 21:04

soulsonic wrote:
earthtonesaudio wrote:So if you were to make R5 variable, for use as a high-cut filter, what value would you start with? 10k? 100k?
I would start with 100K... it will be much easier to hear what difference it may make by starting with a large value like that. But it might require a different MOSFET type to get the desired filtering effect... see Gus' post.

I tried it on the output of a filter I'm working on, and with a bs170, I didn't notice much of a treble reduction until the resistor reached 1M, and even then it was just barely noticeable. Maybe someday I'll try it with a power MOSFET.

Post by **sidehatch** » 25 Jan 2009, 07:24

Martin,

Please out me down for one.

From the looks to thepedal to the board design and the fact you are doing something different makes me want one. The board looks fantastic period/
You have already made me so happy rebuilding my lm308 pedal and turning it into a killer.

I have been wanting something low to mid gain and judging buy your description I want one. I will also make you some pro tools clips .

I am amazed at every conversation I read that you are involved in and every pic of your pedals and boards.

I'm sure I going to want this over a klon!!

plexilover · Post by **plexilover** » 04 Feb 2009, 21:50

any news?

plexilover · Post by **plexilover** » 19 Feb 2009, 23:42

come on, nothin new today?

soulsonic · Post by **soulsonic** » 20 Feb 2009, 00:45

What? If you want to build it, it's all there. You might want to put a treble-cut tone control on it... but that's easy enough.

WhiteKeyHole · Post by **WhiteKeyHole** » 20 Feb 2009, 01:26

A BC108 also sounds nice, livelier.

plexilover · Post by **plexilover** » 21 Feb 2009, 17:24

any soundsamples?

nooneknows · Post by **nooneknows** » 21 Feb 2009, 20:54

WhiteKeyHole wrote:A BC108 also sounds nice, livelier.

instead of the mosfet?

WhiteKeyHole · Post by **WhiteKeyHole** » 21 Feb 2009, 22:03

soulsonic · Post by **soulsonic** » 22 Feb 2009, 06:07

Put an NPN germanium in there and we could call it the Angry Beard IV.

devastator · Post by **devastator** » 22 Feb 2009, 14:24

Hi,

I can keep the Honey control desing to add it in a simple jfet booster ? I would like to do a jfet booster with a cool "tone control" (mine has a toogle switch).

I think I can but I prefer ask to the conceptor.

thanks

soulsonic · Post by **soulsonic** » 23 Feb 2009, 02:54

Go ahead, it should work well, though you may want to experiment with different values/tapers for the control. I've also used a setup like that for the Fuzz control in a Fuzz Face with good results... it becomes more of a Sustain control that fades from a bright crunchy sound to a thick fuzzy sound.

stephenxvp · Post by **stephenxvp** » 01 Mar 2009, 07:35

My thanks to Martin for another pretty design.
I have built mine with a 741 works well: especially cascaded with a sho and hotcake, and a fred briggs fuzz, ear burning over the top high gain and just extremely pleasant mayhem is possible. Mine probably has an overly large amount of gain never goes much past 9 o'clock and is rather too much in the shrill end of the sonic spectrum.
So a couple of questions: would the LM 301 make much difference and how do I wire up the 10k/2.2nf & 12k/3.3nf filter mentioned a page or so back?

soulsonic · Post by **soulsonic** » 01 Mar 2009, 08:43

I highly recommend Mark Hammer's incredibly useful "Stupidly Wonderful Tone Control". Just place it after the output cap and before the volume control. Choose values to taste.
Here is the info from Mark's page: http://hammer.ampage.org/files/SWTC.gif

The advantage of using the 301 is that you have the external compensation cap, so by adjusting that, you can adjust the frequency response of the opamp. You could use a 308 as well, but it's not as dark sounding as the 301 when it distorts.

Today, I breadboarded a variation using a 741 with an NPN germanium transistor instead of the MOSFET. I bumped up the gain and low frequency response to make it more of a fuzz... sounded pretty cool.

stephenxvp · Post by **stephenxvp** » 03 Mar 2009, 09:32

Thanks for the response. Done added the Stupid tone control, never knew playing with that formula could be so much fun.
Has improved the sound heaps; a bit like a jar of Hunny with a handful sand mixed in and then it gets downright dirty, must try the 301 chipas I would like it smoother for longer.
Would still like to know how to set up the double filter arrangement, can anyone draw a quick schema?

briggs · Post by **briggs** » 15 Mar 2009, 00:37

stephenxvp wrote:My thanks to Martin for another pretty design.
I have built mine with a 741 works well: especially cascaded with a sho and hotcake, and a fred briggs fuzz, ear burning over the top high gain and just extremely pleasant mayhem is possible. Mine probably has an overly large amount of gain never goes much past 9 o'clock and is rather too much in the shrill end of the sonic spectrum.
So a couple of questions: would the LM 301 make much difference and how do I wire up the 10k/2.2nf & 12k/3.3nf filter mentioned a page or so back?

Check out the runoffgroove pedals. At the end of their circuits they have a double pole low pass filter set up - that is what you need to replicate but using your values. It's just running two low pass filters in series really!

Good to see you built my fuzz up! It a little fire breather that can be nicely tames with usage of your guitars volume control

stephenxvp · Post by **stephenxvp** » 26 Mar 2009, 03:18

I have just replaced the 741 with the LM301; it does make a difference. In fact just changing the opamp gives you almost a completely different tone palate. Some of you long time builders are probably very aware of that, but it is a very satisfying discovery. The road to insanity could be signposted by all the possible tweeks.

I am probably going to remove the tone control to let a bit more of the treble nasties through; interesting how those higher frequencies do matter.