| Love the bumblebee fuzz. Wanting to strip it down [message #2208] |
Tue, 12 May 2009 03:01  |
 80k_
Messages: 71
Registered: May 2003
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After years of playing with all the 4MS circuits, the Atoner is my favorite. I love tweaking it out, playing around with the squelch and rickle, and getting nice deep LFO action.
On the other hand, I find myself using the basic fuzz sound a lot. Basically with squelch, rickle, and envelope depth all the way down, and position way up.
I'd love to have a fuzz with just output level and tone control. MAYBE a blend control to help get some clarity on notes.
Looking at the schematic, i'm wondering how much can I strip away and still get this bumblee, ultra-thick wall of fuzz sound? I'd like to start breadboarding the circuit sometime soon, but just wanted to see if any of you had any tips on stripping down the Atoner? Thanks!
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| Re: Love the bumblebee fuzz. Wanting to strip it down [message #2209] |
Tue, 12 May 2009 04:37  |
Remork
Messages: 25
Registered: May 2009
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Junior Member |
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hi
haven't made the atoner (yet), but basically any pot that's either fully closed or fully open can be replaced by either a jumper or a fixed resistor of the pot value.
(you probably knew that, but what the heck.)
* if you're not using the LFO or envelope, my guess looking at the schematic would be that you can take out everything between D1 and pin #5 on the 4151 chip.
it's possible that you'd have to connect that pin to ground or a voltage of some sort instead, but i'd try like that first. (? measure voltage on pin #5 with pots in your favourite position).
* to take out the squelch pot: actually, it's possible to replace R2+R6+trim+Squelch with a single resistor, forming a voltage divider together with R1.
this determines voltage fed to pin #7.
i would measure resistance between pin #7 and the pot lug going to ground (but disconnect that first.) my guess is you'll end up around 10K (either that or 20K).
* if you don't want the blend pot, you can take out C1, R4, R5 and the pot itself.
and i would jumper R14 as that becomes overkill. or even go straight from the TL072 output (pin #1) to C5, skipping C7, R13 and R14.
all that would leave you with a circuit consisting of input stage, the 4151, tone section, output stage. i.e. tone control and volume control only.
oh, and since you'd only be using 1/4 of the TL074 (U1) - pins #1,2,3 on the input stage - and 1/2 of the TL072 (U3) - pins #1,2,3 on the output stage- , i would lose the TL074.
just use the unsused half of the 072 (that was used in the LFO) for the input stage. they're all the same opamps, so you can swap around freely.
gimme gimme gimme
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| Re: Love the bumblebee fuzz. Wanting to strip it down [message #2213] |
Tue, 12 May 2009 22:19 |
dann
Messages: 775
Registered: December 2002
Location: Austin TX |
Senior Member |
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This is a great thread, lots of possibilities here.
| Quote: |
* if you're not using the LFO or envelope, my guess looking at the schematic would be that you can take out everything between D1 and pin #5 on the 4151 chip.
it's possible that you'd have to connect that pin to ground or a voltage of some sort instead, but i'd try like that first. (? measure voltage on pin #5 with pots in your favourite position).
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If you remove the FET (2N5485 aka Q1), then you'll need to keep C11 and R22, or else the 4151 chip won't work (aside: it needs to have a capacitor to ground and a resistor to V+ at pin 5-- this creates an RC time constant which the 4151 uses to generate its output pulses-- see the NJM4151 datasheet, it's a neat and under-exploited chip!).
With the FET gone, probably you will want to change R22 from 220k to 10k or so, and changing its value will be like turning the Position knob. Of course, removing the FET will get rid of not only the envelope and LFO, but also Position....
| Quote: |
* to take out the squelch pot: actually, it's possible to replace R2+R6+trim+Squelch with a single resistor, forming a voltage divider together with R1.
this determines voltage fed to pin #7.
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Yep. just make the new resistor the same value as R1 (10k). For maximum sound/mininum squelch-out, you should measure equal voltages at pin 6 and pin 7 when you're not inputting a signal.
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| Re: Love the bumblebee fuzz. Wanting to strip it down [message #2214] |
Wed, 13 May 2009 02:31 |
80k_
Messages: 71
Registered: May 2003
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Member |
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Hi Dann,
Thanks for the clarification on what to do with Pin 5. I'm looking forward to getting started on this. Too bad I forgot to get a 4151 chip during my last Mouser order, so looks like I'll have to do another order soon!
This is such an amazing circuit. BTW, I recently did a youtube video demonstrating this pedal. http://www.youtube.com/watch?v=0Iu42a2wXtQ
[Updated on: Fri, 15 May 2009 01:21]
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| Re: Love the bumblebee fuzz. Wanting to strip it down [message #2221] |
Thu, 14 May 2009 04:46 |
Remork
Messages: 25
Registered: May 2009
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Junior Member |
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damn that goatkeeper is nice. what chip would that be based on anyway?
just curious, as these variable shape tremolo's seem to be the next big thing.. saw a smaller but similar thing recently on a blog somewhere.. see if i can find it, i'll link.
[Updated on: Thu, 14 May 2009 04:48]
gimme gimme gimme
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| Re: Love the bumblebee fuzz. Wanting to strip it down [message #2222] |
Thu, 14 May 2009 06:33 |
Remork
Messages: 25
Registered: May 2009
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Junior Member |
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http://soniccrayon.blogspot.com/
'hollow earth waveshaper.'
slightly OT, i know, but fun nonetheless
gimme gimme gimme
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| Re: Love the bumblebee fuzz. Wanting to strip it down [message #2347] |
Sat, 21 November 2009 07:29 |
slikviq
Messages: 34
Registered: May 2008
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Member |
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sorry, wrong post
[Updated on: Sat, 21 November 2009 07:30]
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| Re: Love the bumblebee fuzz. Wanting to strip it down [message #2508] |
Mon, 24 May 2010 14:06 |
dann
Messages: 775
Registered: December 2002
Location: Austin TX |
Senior Member |
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Have you adjusted the trim pots by the position knob? Also you usually have to hand-select the 2N5485.
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