Wednesday, 1 May 2019

Fortin Amplification Zuul

Original info:
"ZUUL is the most transparent noise gate on the market! Studio quality specifications with simple straight forward operation. The ZUUL’s threshold knob also controls the dynamics of the gate circuit. Perfect for guitar, bass or any signal source as it has studio quality specifications. Use in front of an amplifier or in a series effects loop. Dual colour LED for visual feedback gating action: Green = Open, Orange = Closed, Off = Bypass. The KEY input signal can be directly from your guitar (ex. split from ROACH or SPLIFF) or other signal source which lets you go from clean to high gain without changing the Threshold knob. This powerful feature lets you control the gate with a different signal than what flows through the input/output jacks of the ZUUL. Side switch or internal jumper to change the threshold range if you are injecting a large signal into the input and not using the key input"
You can find PedalPCB's schematic, info and pcb on their website here.



20 comments:

  1. Thank you for this layout! I have a noob question though... What are the yellow things? I don't know that I've seen those before on a layout.

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  2. They are normal capacitors

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  3. this is awesome, thanks alex!
    i just bought that THAT4301 IC few weeks ago thinking "i might have time to make a vero at some point".
    ill try this asap!

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    Replies
    1. Cool! If you don't want the Key Jack, just add a link between the 2 tips.

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  4. The THAT4301 is EOL since 29th of April 2019 and will only be available till Q1 2020. I'm working on a redesign based on the 4305 but that one is only available as SMD (QSOP16).

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  5. This comment has been removed by the author.

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  6. Thanks Alex!
    I'm having trouble finding a 560nF cap, would it be advisable to swap it with a 470 or 680 nF ?

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    1. You could also try putting a 100n and 470n parallel to form 570nF. That will be closer than the 470/680 you suggested.

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  7. Ebay has lots of 560nF caps. Try to find the brand ERO. Seller whazzgroover has some if you want them (no that's not me :).

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    Replies
    1. I missed your comment and ended up ordering from Tayda. Thanks anyway!

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  8. PedalPcb have a pcb for this and they sell the THAT IC as well

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  9. SMALLBEAR HAS THE THAT4301 CHIPS FOR ONLY 10 BUCKS PLUS SHIPPING

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  10. The information you share in the article is very helpful, thank you, I will visit the blog more often.
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  12. Where to get the proper LED?? The Fortin changes the color Green to Orange. I've purchased 3 or 4 different LEDs types and they all SUCK!!...cant tell the difference of change, some only look like orange and higher intensity orange, some just look like little points of light, and some are soo bright and clear bezel, like looking into a laser!!! NOT finding a suitable LED. Please provide source and part number. Thanks,

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    1. It is not the LED fault.... change the values of the current limiting resistors (both 5k6 top left, going to LED1+, LED2+). Orange is a result of both LEDs being ON in the Bi-color LED. Lowering the resistor value will make a color shine brighter and upping the value of the resistor will make it shine dimmer. You could use a 10k trimpot instead of the resistor for LED1+ and experiment. Once you find the value you like, measure the trimpot and replace the trimpot with the nearest standard resistor value.

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  13. what about wiring if I use three socket jacks

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  14. Well... my pair of 4301’s just arrived!! Now to find the time to try this build out :D

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