Amptweaker - Defizzerator  [traced]

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J0K3RX
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Post by J0K3RX »

Found this the other day...

Not earth shattering but add it to the collection...

https://paulinthelab.blogspot.com/2017/ ... board.html
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Amptweaker Defizzerator schematic
Amptweaker Defizzerator schematic

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moltenmetalburn
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Post by moltenmetalburn »

This is not 100 percent correct.

I traced my own unit and created a shared PCBWay project if you want to add to your next order:
https://www.pcbway.com/project/sharepro ... bfcb1.html

I did notice the resistor was a precision 1.000K if you want an "accurate" clone. enjoy!

Also have a mini version:
https://www.pcbway.com/project/sharepro ... 95c1d.html
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DEFIZZERATOR REVBc.png
DEFIZZERATOR REVBc.png (9.51 KiB) Viewed 2634 times
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Ichabod_Crane
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Post by Ichabod_Crane »

I didn't understand what's the difference with the schematic on the orange box above.
The 1k resistor is 1k.
Is the position of the 1k, before and not after the caps? Indeed placed after the caps it's weird, I'd say.

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moltenmetalburn
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Post by moltenmetalburn »

Ichabod_Crane wrote: 19 Jan 2022, 09:32 I didn't understand what's the difference with the schematic on the orange box above.
The 1k resistor is 1k.
Is the position of the 1k, before and not after the caps? Indeed placed after the caps it's weird, I'd say.
yes, just noting that it is a little different than my actual unit, that resistor placement, and posting shared pcb links. :thumbsup
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asmiroth
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Post by asmiroth »

Will there be a sound difference between the two?

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bmxguitarsbmx
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Post by bmxguitarsbmx »

asmiroth wrote: 18 Nov 2022, 15:36 Will there be a sound difference between the two?
It matters. Use the second scheme with the 1k resistor from input into the capacitors. It makes the so called "RC filter".

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Axldeziak
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Post by Axldeziak »

The frequencies on the schematic for Buzz and Crackle appear to be wrong. When calculated they come out as 7.23khz for Buzz (22nf) and 3.38khz for Crackle (47nf), not 4.2khz and 2.5khz. To match those numbers, Buzz would have to be 38nf, and Crackle would be 62nf.

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Post by Ichabod_Crane »

bmxguitarsbmx wrote: 18 Nov 2022, 19:12
asmiroth wrote: 18 Nov 2022, 15:36 Will there be a sound difference between the two?
It matters. Use the second scheme with the 1k resistor from input into the capacitors. It makes the so called "RC filter".
Of course! I don't remember why I ask it. Maybe I thought it was something weirder.

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asmiroth
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Post by asmiroth »

May i ask if you have a vero version of this?

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Post by bmxguitarsbmx »

Axldeziak wrote: 18 Nov 2022, 22:28 The frequencies on the schematic for Buzz and Crackle appear to be wrong. When calculated they come out as 7.23khz for Buzz (22nf) and 3.38khz for Crackle (47nf), not 4.2khz and 2.5khz. To match those numbers, Buzz would have to be 38nf, and Crackle would be 62nf.
I wouldn't get too wrapped up in exact frequencies. I assume this pedal is to remove fizz from dirt pedals and we all know that the output impedance is totally non-standardized. There are certainly pedals out there that use 1M as the Level control, which is a 500k output impedance worst case scenario. An output impedance of a TS808 is ~100 ohms and this pedal would likely add distortion to the emitter follower by being such a low input impedance. I don't approve! But, most likely it is a useful pedal and reacts differently to every pedal you own and that can be worth the price of admission.

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Axldeziak
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Post by Axldeziak »

I screwed up and failed to notice the caps are in parallel.
Now the numbers work out to what the schematic listed. durp...

As for impedance, the pedal's manual says it should be used following a buffer or active pickups.

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Post by Dr.Detroit »

The circuit would make more sense with the 15n connected to the pot instead of ground. Otherwise, the pot does nothing in the switch middle position. :hmmm:

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AxelKay
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Post by AxelKay »

Why are there three different ground references in the schem?
I don't quite get the <T>

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