Tuesday, 15 April 2014

Madbean Cave Dweller II Dub Edition

As requested, version 2 of the Cave Dweller with all noted mods included.
Info from Brian which can be found in the PDF linked in the version 1 thread

Cave Dweller II (“Dub Ed.”) expands upon the underlying design of CDI , but adds an additional PT2399 for roughly twice the delay time. It also combines the two feedback controls into one. An additional mod has been included if you wish to add a true Mix control to Cave Dweller II.

Cave Dweller II Controls

Time – This sets the delay time.
Dwell – This control is a combined version of the Dwell and Echo controls of CD1 (thanks, Alex!)


Cave Dweller II - Dub. Edition - is for those really cavernous delay needs. It utilizes the current mirror set-up of the “DM-5” delay project to achieve roughly twice the delay time of CD1. The max delay time should yield about 1 sec, although a mod has been included to artificially reduce this, if desired.

In this version, Dwell and Echo are combined into one. The control works slightly differently than CD1. At minimum, the repeats are filtered on the opposite end of the spectrum, meaning they are more “telephonic”. This setting sounds very similar to the Deep Blue Delay. At max, the repeats are dark and ambient similar to the CD1.

One caveat with the combined control is that there is minimal influence on the number of repeats produced by the effect. For those builders who wish to add an additional Mix control to limit the number of repeats, a simple mod has been included. Please see the illustration below on how to implement the Mix control mod.

Additionally, the dark repeats have been limited to non-oscillating by using a larger value for R12 . If you do implement the Mix mod, you can lower the value of this resistor from 750k to a value between 470k and 560k to re-introduce oscillation. This is not recommended when not using the Mix mod.

One other mod has been included with R20 . This resistor resides in parallel with the Time control and allows you to reduce the max delay time of effect. This mod was included for those who prefer a cleaner delay (max delay times with PT2399s tend to introduce some digital artifacts and noise). The value can be selected to taste, and a 200k is suggested. This results in roughly 20% less delay. A 150k resistor yields approximately 25% less delay. 

Madbean Cave Dweller

Nice sounding mini delay, designed by Madbean to fit in a 1590A box, and after checking with Javi this layout should fit in one too :o).  Tantalum caps or mini electros may be needed to keep things as compact as possible, and maybe a multi layer ceramic for the 1u.

Info from Brian about his original project:

The Cave Dweller I is a low parts count delay comprised of a single PT2399 chip and fitted for a 1590A enclosure. This ranks as a “mediumi-fi” type circuit, meaning that filtering of the PT2399 is kept at a minimum in favor of a small footprint. While you won’t get quite the fidelity of the Echo Base, for example, it still sounds very, very good and offers a somewhat unique flavor of delay. The effect takes advantage of the two on-board amps of the PT2399 for use as input and output mixers. The feedback and filtering are combined in a unique way which produces a slightly different set of controls than the typical PT2399 delay. This leads to some really “haunting” and musical repeats at long delay times.

You can read more about it in the project documents here, and if you prefer, the PCBs can of course be purchased at http://www.madbeanpedals.com/projects/index.html.  Check out some of his other boards while you're there.  I just bought a Pork Barrel, Collosalus and StageFright from him which are fantastic quality, and are builds that I would always prefer to opt for PCB over vero.

Monday, 14 April 2014

EHX Satisfaction Fuzz

Note that the C7 and the D2-D3 are not present on the original pedal. There are holes ready for those components. Adding C7 as 4n7-100nF cap will increase bass response and adding diode clipping to the place of D2 & D3... Well. That will make this an different animal.

Grind Customs Electric Boogaloo Optical Tremolo

Another project collaboration between Rej at Grind Customs and CultureJam, similar to the Shoot the Moon but with a couple of subtle differences including a shape switch instead of the wave pot (similar to the 2 knob version we did).  If you don't want to roll your own with the LDR and LED, the Vactec VTL5C3 is the recommended vactrol.

I can't find a video anywhere, so if anyone can make one that I can post with the layout that would be great.

Black Arts Toneworks Black Forest

A modern upgrade on the Colorsound Overdriver.  I have included a 6 position 2 pole rotary switch and you can do it one of two ways.  Use the cap daughterboard I have shown in the layout (which will only actually uses one of the poles), or if you prefer you can just solder the caps straight to the switch like this:

Input > Sw A
8n2 between lugs 1 and 7
10n between lugs 2 and 8
22n between lugs 3and 9
47n between lugs 4 and 10
220n between lugs 5 and 11
470n between lugs 6 and 12
Sw B > out to Q1 base on board

If you do solder straight to the switch then I'd recommend putting a 1M resistor between the input wire and ground in a convenient place to avoid those switch pops.

Info about the original:

Black Arts Toneworks unleashes their latest pedal, the Black Forest overdrive. Based on the legendary Colorsound Overdriver, the Black Forest provides that classic tone in spadeswith a difference. Not only is the classic Overdriver tone there but the Black Arts Toneworks Black Forest adds more grit and gain as well as a bit fatter tone than the original while at the same time decreasing the noise floor to astounding quietness. When the gain is maxed out, the sound is very fat with harmonic-laden overtones and a classic sound that no guitarist can deny. In addition to this, the Black Forest also features more tonal control with the addition of a six way Depth control. This allows the user to cycle through six different capacitor configurations that alter the voice and gain structure of the unit offering an array of sounds not available in the original circuit. The additional gain on tap allows the Black Arts Toneworks Black Forest to achieve anything from a gritty boost to a classic overdrive to a vintage fuzz tone and will keep the inspiration coming for even the most seasoned players.

Should all layouts be verified before publishing? This would mean less layouts but more peace of mind?