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With the amount of issues I've had with various transistors lately, I really need to get a transistor tester.

I popped the 4401s out for for some 5088s, and BAM. Fuzz to my skull

Thank you, that's counterintuitive for sure.


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Yep! 
Totally threw me at first too

This doesn't have anything to do with voltage, but your effect in wire is connected to the jack in pad. It needs to go to the in pad at the bottom.


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Nope, not on this one. Your suggestion was how I originally had it wired, and no input was getting to the effect

I'm on the road right now so can't check my build but I remember agonizing over the orientation of PRI/SEC on the transformer.  I can't imagine that having an effect on voltages though.

Yeah, the transformer s shouldn't be effecting em. I do have them oriented according to the screen print and build doc. I've also bypassed them just in case they were somehow interfering.

It's almost like there's a messed up trace or short somehwere, but I can't see it. Q1 is especially baffling me. I can't see any reason why it'd be getting almost full voltage

Soz I went over it again, measuring the values
of all the resistors, and noticed R11 was 1.3k. while that wouldn't be causing the issues, I did replace it with the correct 1.2k.

I've followed all the traces, and everything seems to go only where it's supposed to do I'm kinda at a loss at this point

Are those two tantalums in parallel in the first pic? If so, you may need to put them back to back. Honestly, I'm not sure due to their sensitivity to voltages.

They are parallel, as I didn't have any 220u tants on hand. They're 100u / 35v.

Your voltages look way off as compared to the build doc. Have you checked your resistor and cap values? Also, no GEs?


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I've visually checked, and all values look correct.
When I get back home, I'll measure them

I do have some d9k and GAZ51, but meh. I've been using the 5817s in all of my recent octup builds, including another Retrograde I built recently, and haven't had an issue.

Except for the transformers and electrolytic types, I used identical values. Diodes are all 1N5817.
I've looked them over, and I think I have all the values correct. They pass signal, but I have to really dig in for them to respond.
I'm guessing I got a value or two wrong, but nothing's popping out

Voltages (they're almost identical for each)

Q1 - C 8.56
        B 8
        E 5.53

Q2 - C 9.14
        B 8.56
        E 3.20

Q3 - C 2.59
        B 3.20
        E 2.52

2N5087s and 2N4401s used

I should add- the Junk Trunk is my absolute favorite envelope filter. It just does so much, and covers a ton of ground. I highly recommend it for anyone looking for a filter

this is next level, my dude. I'm in awe!

Rad, thank you!

Thanks!!

I wish I could play like Bootsy

A Gas Tank (Brown Dog clone) into a JMK Paralyzer, with a Junk Trunk (Agent 00Funk clones) in each loop. There's and FX loop between the Gas Tank and Paralyzer, with another between the send of the Paralyzer and second Junk Trunk.

No mods done to the Gas Tank, so it's just that classic gated, clean-blendable fuzz we all know and love.

Mods to the Junk Trunks include:
C2 & C3 replaced with a 2p6t with 1n, 4.7n, 10n, 22n, 47n, and 100n caps selectable. This takes the filter from shrill to thumpy
C6 has been replaced with a toggle to select the stock 4.7u or a 1u for quicker decay
I used Orange LEDs for the peak detector because of their slightly lower vf compared to the Yellows the build docs calls for. This allows a bit more control voltage into the filters from the envelope section
As with the rest of the controls, the added switches are highly interactive with every other parameter
I also used NE5517s in place of the LM13700s, but I don't hear a difference in this circuit.
You'll notice two jacks adjacent to the 9v jack. These were meant to be CV outs from the envelope detector but, they don't seem to work when it's boxed. I'm not too fussed about them, but I will revisit and get them working eventually

First demo shows the range of the cap selectors on a single Junk trunk

This one shows off a bit of the parallel sounds

And here it is paired with a dual FV1 project, one set for a ring Mod sound, the other for Bitcrusher

Here's another longer demo. This one has Lm324s and a TL072

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

OR you could post a demo of this awesome machine!


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It's in the other thread