Flawed Logic Fuzz MKII
I'm proud to present the Flawed Logic Fuzz MKII.
The original Flawed Logic Fuzz was a fun circuit, but it suffered from too short sustain and the modulation part could have been better. The MKII is improved in these areas and also has a couple of new features such as a depth control and a waveshape switch for the LFO. I'm especially happy with the new triangle LFO waveshape that makes a sort of phaser'ish sound.
This circuit is made up of a square wave fuzz followed by two gated oscillators in series (NAND gates). The LFO modulates the frequency of the second oscillator. This produces a very synthy, throaty sound that is unlike any other fuzz. I hope you like it. :)
PCB avaliable in the shop
6/28/2015 05:39:53 am
I've been on the lookout to see this!
6/28/2015 06:04:30 pm
7/1/2015 04:02:50 am
Hi! Just built this monster. After some hassle with the LFO switch I got it working; as you states a throaty brutal fuzz with a quite flexible LFO section. I really dig the triangle wave mode...is there a way to slow the speed of the modulation, I'm craving for long filter/phaser sweeps. :-)
7/1/2015 06:17:55 am
Thanks for the build report. :)
7/17/2015 11:38:14 am
The build instructions say the resistor is 2N5485 is one place and 2N5458 in another. Which one is it supposed to be? Would a 2N5457 or J201 work as well? Thanks
7/17/2015 06:39:23 pm
9/29/2015 10:03:58 am
10/6/2015 09:42:59 am
12/8/2015 07:00:53 am
Built the PCB version of this and am only getting farty noises out of it.
12/29/2015 03:27:58 am
7/22/2016 06:46:14 pm
Hi! I'm almost finished with the vero version of this. Could you tell me, do poles 1 and 5 of the LFO switch connect anywhere? Also, I'm using CD4069UBE and CD4093BE. Are those correct?
4/12/2017 04:16:09 am
3/31/2017 01:18:03 pm
Please help made vero of this and after 3 builds of this it's still not working it's actually very upsetting cause the demo vid is teasing me
4/12/2017 04:17:45 am
Can you discribe how it's not working? I can't help without more info.
4/12/2017 02:04:01 pm
it just squels and oscilates seeems to have no input signal or output hang on i think it may be due to incorrect tran would that be an explanation?
4/12/2017 04:22:41 pm
got the right transistor but still nothing man any chance you could email me a crude wiring layout im lost as to what ive done wrong
5/6/2017 03:46:21 am
The transistor isn't crucial. It will work without it, but without the modulation/LFO section.
4/29/2018 03:28:28 pm
Hi Fredrik, are n´t you selling this item anymore? Greetings from Hamburg, David
4/30/2018 01:40:15 am
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