Casper Electronics Echobender

Something weird to do with your extra PT2399s. From Casper Electronics :

The Echo Bender is a mix of multi FX pedal and noise maker.
It can process external signals like guitars, keyboards, mics and drum machines or it can create complex sounds on its own.

It can function in several different stand alone modes: 
-Warm analog sounding echo.
-Highly adjustable distortion.
-Ring mod style feedback.
-Complex noise generator.
-These modes can be used on their own or it can all be mixed together to achieve effects ranging from melodic and dreamy to chaotic and screamy.

The noise generating capabilities are especially interesting. The echo rate range has been set much lower than the standard echo pedal. When the rate is turned WAY down, the sound breaks up into blipping squeals and screeches. Combine this with distortion and feedback tones and a reverse decay setting and you’ve got a lot of variety and tonal complexity.

Video demos and additional information on the Casper Electronics site.

Runoffgroove Azabache

As requested. A long time ago. Size of the board tells you why it wasn't drawn up earlier....

From ROG:
More than a year ago we set out to revise and improve the Professor Tweed. Several approaches were pursued, but we were unsatisfied with the results. One of the downfalls was the high level of interaction between the tone and gain controls. Just as in the original Princeton amp, the tone control became ineffective when gain was set close to maximum. In addition, this arrangement was adequate only for a very specific type of sound.

We decided to step away from the inspiring amp's circuit and concentrate on developing a solution superior both in tone and usability. Builders may notice that the design does not correspond to any particular existing amp or pedal circuit. Though the use of a modified "Big Muff Pi" style tonestack is apparent, it is placed before the overdrive sections as opposed to its common location as a final tone shaping device.

The result is a circuit that is much more flexible and refined than its predecessor, and in our opinion it captures a wider variety of Fender-like tones. We have named this new circuit Azabache, which is the Spanish word for "black amber". The duality of its name recalls the Blackface and Tweed aesthetics.

This pedal has a very effective and flexible Tone control that varies the sound from fat and warm when set fully counterclockwise, to full at the center, to thin and bright at the clockwise end. In addition, two switches further expand the tonal possibilities: a Bright switch adds a glassy character to the sound, while a Scoop switch reduces the midrange around 400Hz to achieve more clarity. The different switch combinations produce several sounds which we have loosely named as follows: 

Bright OFF / Scoop OFF: Blonde mode
Bright ON / Scoop OFF: Brown mode
Bright OFF / Scoop ON: Silver mode
Bright ON / Scoop ON: Black mode

As for the Gain knob, it can adjust the sound from almost clean, to a warmed-up light overdrive, to a medium overdrive, to a quite gainy overdrive. Each stage is set up to produce a moderate amount of gain while avoiding hard clipping in the JFET itself. The result is a refined overdrive with a natural note decay that reacts very well to the guitar's volume knob.

Finally, the tone shaping that takes place at the end is essentially modeled after the distinct frequency response of a Jensen P10R speaker, with its bright tone and deep 400 Hz notch. We think of this part of the circuit as a mini-Condor Cab Sim because the frequency response is akin to the Condor, however adapted to take into account that another amp and guitar speaker will follow afterwards.

Overall tone was optimized for solid-state amps that are moderately bright. If using a very bright guitar and/or amp it may be desirable to tame overall brightness a bit by changing the 1n capacitor between Q4 and Q5 to 1n5. Conversely, a bit more brightness could be achieved by replacing said capacitor with 680p. For best noise performance, it is recommended to use metal film resistors and replace the drain trimpots with fixed resistors once the necessary value is determined. Good wiring and shielding techniques are also encouraged.

Video of Geiri's build:

And according to discussion below (and the ROG post on DIYSB), the excessive treble content on the tone control can be cured by just lowering or shorting the 47K resistor at tone pot lug 1 connection. So here's a "fixed" version of the layout. I used 4K7 for this resistor, which should be  low enough to achieve better tone control. But you can go even lower or replace that resistor with a link if you want to.

Behringer VT911 Vintage Tube Overdrive

Now that i'm back home, i thought i'd post a few more big ones for this month. You know. There's 31 days in march and we only had 28 layouts out.. So here's couple more to match the number of days. :)
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I never thought i'd draw up a Behringer original, but once i saw this it just made sense. IC pinout is matching the TL074, as there's not that much easily obtainable info around about the original "Coolaudio Quad Opamp". I'm just guessing that the pinout matches with TL074. Anyway.. This is quite nice and relatively simple 9V tube circuit. You should probably try out other pin-to-pin equivalent tubes in there too.

I'd really like to see this one done in 1590B with a tube socket on top :P

Pearl OD-5 Overdrive

Do not start building this one yet as it contains errors. Norwichbadger's amazing footwork on the comments will tell you how to fix yours, if you've built it already. I'll be fixing the layout or redrawing it at some point...

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Olav's relentless requesting took a few things before i got it done. First, he stated that he's happy with the PCB layout he found on the internet. :) And about four months. Told you it was going to be huge.

Transistor pins are once again made for modern everyday transistors like 2N3904, 2N5088 and so on. Original unit has 2SC2240s in it, so if you want to use those, just mind the pinout. Anyway. Here it is. Let's just hope it is correct. And happy easter for everyone!

Danelectro Fab Tone

Since we're having a streak of big boards... :) Guess i'm getting old too since it's been over 15 years since this appeared on the marked.. This layout is without the input, output and switching buffers. Should still go nicely in B box. The transistors were 2SC1815GR on the original, but i've tweaked the layout to accept more commonly used pinouts. If you want to use the original ones, just mind the pinout. There's room to get the BCE transistors in neatly. But you should be golden with any NPN, like 2N5088, 2N3904, BC549 or BC550.

Fab distortion from the Tube Pioneers.

Danelectro pioneered tube amps in 1947. This hot little box delivers the definitive vintage distortion. Its tonality covers a range far superior to most popular distortion units. 2 tone controls offer infinite variation.

*Edit! There were two wrong cap values on the layout - now fixed! (2016/07/16)