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Guitar is a Fender Marauder, and the video starts on the Jazzmaster neck pickup.  Later switch to bridge pickup, which is a Humbucker from Hell.

The amp is set very clean, a DIY KT66 push-pull amp with 12AX7 pre and 12AU7 PI (designed that way), and ALL drive is from the pedal.

One Egghead circuit is always on (red led) - last in pedal order.  It's modified with 2 2n4148 diodes one direction, and 1 2n4148 plus two 1n60p the other direction.  The voltage divider is 8k2//10k (like the Timmy).

The left footswitch engages a second Egghead circuit (green led) that is basically stock.  This circuit is second in pedal order.

The right footswitch (red led) is the Runt, and it is first in the pedal order.

Recorded with an android phone for nigh fidelity 

CHAD

Treat!

CHAD

I really like the playing card graphics.  I downloaded a bunch of card designs a couple of years ago, still looking for an opportunity to use them.

I scanned my playing cards into the computer and used ... wait for it ... ms paint to do the graphic...

CHAD

This looks awesome! Can you do a sound demo?

Thx.  Yep, I'll get a demo up in the next couple of days.  Do you prefer single coils or humbuckers?

CHAD

How about both?

Sure thing.

CHAD

This looks awesome! Can you do a sound demo?

Thx.  Yep, I'll get a demo up in the next couple of days.  Do you prefer single coils or humbuckers?

CHAD

Runt feeding an Egghead feeding a (modified, always on) Egghead.  Great tones stacked together in one box.

CHAD

Thanks drolo.  The pedal came together last night, and it sounds as I hoped.  The Eggheads stack very well - especially with that variable HP filter in the gain stage.  The rat is exactly what I needed for a cut-through-the-mix lead channel.  Once boxed, careful volume knob adjustment (as you noted) is all that is needed to keep the squeal in check.

Now if I can find some decent, TINY knobs to clean up the controls.

CHAD

I'm working on a 3 drive pedal, with wiring yet to do.  The 'base tone' will be always on, and it's a modified Egghead - modified to be more similar to a T!mmy (more similar, not identical).  Feeding that is another Egghead (basically like madbean's) for the crunch section, switchable in/out.  Feeding those two is a Runt for the lead channel.

The idea is to set the amp just under edge-of-breakup, and then set the base Egghead also for edge-of-breakup for a flavorful base tone.  Punch in the second Egghead at a medium gain setting for crunch, and add the Runt as needed for over the top gain.

The three circuits are populated and working.  With all 3 engaged, there is a bit of whine/feedback, and perhaps that's just to be expected with all that gain available.  For those of you with multiple drives-in-one, did you take any precautions to prevent too much gain... like a series resistor to the Volume pot to prevent excessive voltage/current into the next circuit?

Thanks!

Might have to be a little careful with phase, and have the same number of inverting stages for each parallel effect.  Or, it might add to the texture.  Never know until its on the breadboard.

CHAD

This is a fantastic first post. What a great project you've made!

here are several capacitor and resistor changes, but, if you built them stock it would still work fine.

So what changes did you make, and what effect do they have? What would the difference be if you'd built them stock?

Stock would be have brighter repeats.

For both cave dwellers, I changed
R1 to 15k, (reduce noise)
R2 to 20k, (reduce noise)
C2 to 10n, (compensate for lower R2)
C3 to 10n, (wanted darker repeats)
the dwell pot is a fixed 27k resistor between 2 and 3,
R8 is 4k7

In the ZPM,
C19 is 3u3 (only taunt cap I had that would fit the little space)
R18 is 100k
R19 is 100k
C13 is 10n (I didn't have any 15n)
RT is 1M pot
MOD is 1M pot

CHAD

This is the guts before the boards were folded over to solder ins, outs and ground to the footswitch.  It's neither sexy nor noisy.  Without the ability to manage sexy guts, I settle for functionality 




CHAD

Hi all, first post.  This site is a fantastic resource.

I've been playing with PT2399 circuits for a few months now in search of a customizable reverb circuit for my pedal board. I had circuits breadboarded with two or three PT2399 chips in various configurations and feedback arrangements, until the circuit sounded nice. Unfortunately, my attempts at a layout were not pretty. Combine that with intermittent success at etching, and I decided to buy three madbean PCBs, which would cover the basics of the circuit on my breadboard, though not exactly.

The Madbean Zero Point Micro is a standard PT2399 delay with modulation. The Madbean Cave Dweller is a stripped down delay (with a slightly confusing two-pot feedback arrangement).

My pedal is the stock Zero Point Micro circuit with two series Cave Dwellers in the feedback loop. So the ZPM's delayed signal goes through both CD circuits before it's fed back. There are several capacitor and resistor changes, but, if you built them stock it would still work fine.  The signal leaves the ZPM board where lug 3 of the feedback pot would be connected.  That signal goes into one Cave Dweller, who's output goes to the second Cave Dweller, and then on to the feedback pot lug 3.

Something happened with windows media maker and the volume level of the mic'd amp signal is too quiet. Oh, well...

CHAD