madbeanpedals GasTank24 Manual

GasTank24 GasTank24
F
BASS DISTORTON
X Type:
Build Level: Beginner
Based On: Chunk Systems® Brown Dog™
The 2024 version of the BoomBoom has some circuit changes and minor layout tweaks.
The Agent 00Funk and BrownDog were produced by Australia's ChunkSystems and marketed to the
bass playing community (Bootsy Collins was apparently a big fan) around the late 00's to early 2010's.
I'm not sure if they went completely out of business but the pedals seemed to have been discontinued
and only show up on the used market. That makes for ripe DIY projects!
The GasTank is based on the BrownDog. It's a hard-edged op-amp distortion with a clean blend.
The clean blend is essential for bass drives as it allows one to restore some of the bottom end that
sometimes goes away with distortions. The GasTank has minimal tone shaping so you pretty much
get your same bass tone out of it with the ability to dial in some pretty sick square wave. The only
modification I made to the original circuit was to add a 100R current limiting resistor on the power
supply.
The LED bypass system used in the previous version has been removed to make the GasTank
compatible with the SSBP and SSABP switching boards.
• DIRT: Sets the distortion volume at the output.
• CLEAN: Sets the clean signal volume at the output.
• DRIVE: Total gain, from "warm" to hard-edge distortion.
• GATE: This control allows you to dial out noise. CCW - no gate and the distortion is wide open. CW:
as you turn it up it will first eliminate hiss and noise at the highest Drive settings. The further up you
go it starts squash the dynamics into a highly gated response.
• S/H: Left -soft clipping (op-amp distortion). Right - hard clipping (op-amp distortion plus LED
clipping).
• ENV (optional): This jack is used to connect to the JunkTrunk (envelope filter) to allow for more
dynamic response in the filter when both pedals are used together. More details in the Notes
section.
The GasTank and JunkTrunk are primarily bass effects. Whereas the JunkTrunk does have some
good settings for guitar, I would recommend against building the GasTank if you are looking for guitar
distortion. The one exception is if you want some of the synth-type tones you can get when combined
with the JunkTrunk. Those are cool sounding.
This demo will give you a really good idea of how the Agent 00Funk and BrownDog operate and sound:
https://www.youtube.com/watch?v=OEHMyviwZMA&t
Terms of Use: You are free to use purchased GasTank24 circuit boards for both DIY and small commercial operations. You may not offer GasTank24 PCBs for
resale or as part of a "kit" in a commercial fashion. Peer to peer re-sale is fine, though.
Technical assistance for is available via the
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madbeanpedals forum. Please go there rather than emailing me for personal assistance. This is because (1) I'm not always
Last Updated:
November 19, 2024 3:45 PM
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