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Meant to post this is the main build reports sub forum, could an admin please move it?

Stock it's a great circuit, though it does have its limitations which I've tried to mitigate with a handful of mods. There are some other things I'd like to try, but I want to wait until I can get my hands on a few more PCBs before experimenting any further, so I can compare and contrast.

So, the mods I've done are
R1 (100K) replaced with a 1M trimmer have it set for 1M in the vid. This is to increase input impedance, and while subtle I do enjoy it

R5- has been increased to 270k for more input gain

R6 has been increased from 4.7k to 270k to give it more zippiness (according to Mark Hammer, though he suggests 220k). Definitely gives it a little something extra

(Ignore)R9- has been replaced with a 250kB pot, I'm calling this balance, as it adjusts the amount of signal going into the lower tuned filter. Highly interactive with the sweep pot, also effects decay time a bit

R18 is 2.2k because that's what I grabbed

R44 (4.7k) has been added between pin 1 of the Sweep pot and ground to limit the signal dumped to ground and increase the usable range

Sweep pot has been changed to Anti-log taper from linear. Value remains 10k

C1 has been increased to 27n to allow more into the circuit

C2 has been decreased to 1n to raise the cutoff of the clipping circuit

D3 & D4 have been changed to BAT46 for a bit more sensitivity

IC1 is LM1458, though TL072 works great here as well

IC2 & IC3 are currently TL974, though I'm still experimenting with those. The 974 seems a bit dirtier than the 324


I'm really hoping this one makes it back to the shop, as it's a wonderful alternative in the world of envelope filters


Edit - Edit- I copy and pasted from my notes app, and didn't catch it. R9- is stock. R22 has been swapped for a pot to effect the gain of the first peak detector. Guess I'll need to relabel that pot

Oh wow! I love the pedals but those socks. I need some pedal demo socks.

I need to get off my ass and build my polytrog.


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I'll start working up a business plan to provide socks for people who build and demo pedals 

And, you should! It's an awesome standard swooshyboi, but the envelope mode is amazing

Built pretty much stock- Swapped out C2&3 for 22n for a slightly fatter filter, and used Bat46 in the envelope detector for a bit more sensitivity.

I did try a few other mods (sensitivity pot, cap selector, decay pot), but they really only served to further complicate dialing in the Junk Trunk, so I took em out. I might revisit having C2&3 switchable though
Hardwired the buffered out of the Gas Tank to the envelope in as one does, and stuck an FX loop betwixt the two.

As far as envelope filters go, the 00Funk / Junk Trunk is still my favorite overall just because of how many sounds and textures it's capable of with just four knobs. It does the funky thing, the synthy thing, and can get psychedelic. Smooth to harsh, its pretty danged versatile. Highly recommended for fans of filters

Very much diggin the demos and more socks!  Is it possible to define a man by his socks?  I submit it is...

Great builds and demo's!!

So, I'm a flower space cat, then? I dig it 

Thanks!

Here I am dickin around with these circuits. Used a baritone Meteora with Alumitone in the bridge, lipstick at the neck. Middle position

Cool builds!    I really dig the Flunkee, simple controls but still sounds great.

Agreed. For the simple envelope filters, it's my fave

Nice, but those socks, those are the star of the show!


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Everyone needs some spiffy pedal demo socks!

Here's the two Krakens and Flunkee I complete today. Various combinations through the EHX Switchblade Pro. Using a baritone Meteora tuned to drop A. Alumitone in the bridge, SD Lipstick in the neck. Primarily focused on the middle position

So I really wasn't expecting to like the MuTron Micro V (kraken) based solely on video demos I'd seen. Seemed too subdued for my tastes. Glad I was wrong- this things awesome, and fairly unique as far as the filters I've recently built.
They're both mostly stock with the only parts substitutions are R4 and C6- I lowered R4 to 270r and raised C6 to 2n2. I was having issues with the circuits distorting and oscillating with higher range and attack settings, and these two swaps quelled that without sacrificing any of the tones this box is known for.
The only other swaps are I used Bat46 in the pink knobs and Bat41 in the black knob. I played with those to make the circuit a bit more sensitive to dynamics. Of the two, I prefer the 41s.
LM358 in place of the 1458.
And, I also lowered the resistor attached to the Attack pot a smidge, but it doesn't seem terribly noticable.
This box is a ton of fun, though, and I dig the weirdness you can get with the pots at their extremes.

Now, the Flunkee. This is basically identical to PedalPCBs Waddle Box- the only difference being the ability to swap the output of the OTA to the second stage for LPF action. Of the simpler two knobbers, this one's still my favorite, with the LPF mode being the bee's knees. It's funky with just a tinge of synthy bite to it, and it works well with a ton of input signals.
I did tinker with this one quite a bit more, but wanted it to still be an FX25, so....
Swapped out R5- 4k7 to 3k3 for a bit more sensitivity
R19 got changed from 1k to 2k2 to help take the massive volume of the LPF mode
C1 increased to 33n to allow a bit more signal in
C2 increased from 1n to 10n to allow more lows into the envelope detector
C5 reduced from 22u to 10u and placed in parallel with a 270k resistor for snappier decay times
LM358 in place of the 1458 for the envelope detector. Wasn't fond of the ripples and distortion the 1458 was giving
Range increased from 100kb to 500ka for more squonk while avoiding oscillation and distortion.
Sensitivity reduced to 25kb to really focus on the usable portion of the stock 100k

(Copy and pasted from my thread at PedalPCB)

I haven't had actual surgery yet, but I do get bi-monthly steroid epidurals for three ruptured discs in my lumbar. There have been talks of replacing them with a synthetic, but the doctors have just been wanting to drag the epidurals out.

As for the shots, they hurt like hell for the first week, then I get maybe 3-4 weeks of relief before it starts wearing off, and the pain seemingly feels worse than before the shots

Another option, and imo a better choice for chorus circuits, is the HT8970. I've been using those in place of the 2399s in most of my recent builds, and have to have an issue. Of I get a moment later, I'll whip up a demo comparing a PT Florist and HT Florist

The man is a machine.

But, I haven't even posted the Parasit or Fuzzdog boards I've built this past week   

Literally just boxed that one up before taking the pic . Been waiting on some custom stamps, and they just arrived