Dirtmonger Instruments Distortion H Tribute

 Schematic is avaiable HERE.

 

Capitalist Death Cult No One Wants To Work Anymore

 Taking a break from the Madbean bonanza since Chris Stelloh sent a layout and a schematic of one his creations. Some words from the man himself: And yes, this layout is verified.

Here is something I came up with recently that shakes the pillars of heaven, via WAY TOO MANY cuts and jumpers.

It is essentially the modded fuzz face circuit from the Apocalypse Audio H Fuzz with an input buffer (sacrelige, I know), followed by a 5 band gyrator EQ. I used the values from the Dunwich Left Hand Path modded HM-2 and added a 5th lower gyrator that centers at 60Hz, so that bassists can bring the buzzsaw, too. The gain squeals when maxed, but the gate will still clamp down on it nicely. The d311 germanium diode is most likely not necessary. Anything with a .3v volt drop will probably do the job. The 50k trimmer sets the treble content from the fuzz before it hits the EQ stage and sounds best (to me) at about 1 o'clock, but to each their own. This WILL fit in a 1590bb, but just barely!

 

 

 

 

 

Aria AUM-1 Ultra Metal

 Schematic is avaiable HERE.

Capitalist Death Cult Fx Mexicali Räkmacka

 Another layout and a dsign for those like it heavy by Chris at CDC Fx. No blurb from me, Chris does it better:

Things are rainy and depressing here in California. And also depressing in the world, in general. So I've been drawing more layouts.

I was inspired by both the Dead Air Sawzall, and the layout another Dirtbox user submitted to you under the name "Glass Jaw" - with a Bax EQ in the middle of the two LM386 stages of the Acapulco Gold.

So I came up with a modified Acapulco Gold circuit with a better gain control (instead of the common mod of a 1m pot on the input, this one adds up to 10k of resistance between pins 1 & 8 of the 1st LM386) and "sandwiched" (hence the name, hah) an HM-2-style EQ in the middle of the two stages. I'm also running this at just under 18v with the onboard charge pump. The result (I just built it, so it is verified!) is a a pretty versatile amp-in-a-box with Sunn tonality and a switchable 3 band EQ! Not at all "chainsaw" but really cool sounding nonetheless! The TO-92 18v regulator is probably unnecessary, since the TL082 can handle more than that easily, but the LM386-4 is rated to max 18v and I didn't want to risk damaging them.

 

 

Dead Air Sawzall

 Another contribution from Chris at CDC Fx! This layout is already VERIFIED and good to go.

Schematic is avaiable HERE and as you can see the drive section is a modified MXR Distortion+ derivate. You can yeasily tweak it to DOD 250 or countless other variations of the circuit.

BJFe Heavy Swede

 Now this is an interesting take on the Boss HM-2 circuit...

The schematic speaks for itself.

 

Inverted Cross Audio Rat Saw

Schematic is avaiable HERE.

Unsound Circuitry Bloodletter

 Schematic is avaiable HERE.

 

Exar MT-02 Metal

Schematic is avaiable HERE.

 

Exar BM-02 Bad Metal

 Schematic is avaiable HERE.

Exar MT-1 Metal

 Might be something for the HM-2 fans? The gyrator frequiencies and Q's looks promising...

Schematic is avaiable HERE.

Rocktek Metal Worker

 A "bottom of the well" HM2 variant. Differs enough to warrant its own layout, though...

 

 

 

Guyatone PS-024 Distortion H

Guyatone realeased some very interesting, innovative and good sounding circuits in the 80s. Since they are sadly overlooked and quite rare, Deadend Fx decided to trace and release PCBs for some of these gems.

PS024 Distortion H shares some similarities with Boss HM2 but it still differs enough to not qualify as a clone. The most eye catching feature is the 5 band graphic eq at the end of the circuit with its dedicated graphic eq IC which can be found at Ebay and Alliexpress for quite cheap.

Deadend Fx Hive build docs is avaiable HERE.

Dunwich Amplification DIY HM2 "2021 Edition"

 Another take by Dunwich Amplification on the mighty HM2 circuit. Just released as a DIY project at OSH Park it has some tweaks all along the circuit compared to the stock Boss schematic. It also has a built in active clean blend circuit and switches for both hard and soft clipping diodes.

Schematic and BOM can be downloaded at OSH Park. 

 

 

...and a layout with "Dope-Ass Lower-Tuned" values for the gyrator eq section requested (?) by MTK.

These values were calculated by Ryan from Heard Sound Circuits and makes things sound....more evil.

(Low: 62,48 Hz, Mid: 716,67 Hz, High: 1065,5 Hz)

 

 

 

 

Demo time with MTK!

 

 

 

 

Dunwich Amplification Modified HM2 - "Left Hand Path" version

 Traced by AlexS and Fuzzhead, this is a quite tweakable and heavily modified HM2 variant with more gain on tap, more volume, two on/off/on diode switches and a very flexible four band eq. 

It is a quite noisy beast when Gain and all eq controls is maxed out though but a buffer up front helps a lot. Or you can increase 1K resistor connecting to Gain 3 to calms things down. Stock HM2 value is 47k so there is a pretty wide margin to experiment within.

Layout is verified.

 

 

 

 

 

Dunwich Amplification Modified HM2 - DIY version

 Dunwich released a small run of DIY PCBs a few years ago of a modified HM2. There is a few changes from a stock HM2 most noticable the on/off switches for both soft clipping and hard clipping diodes. You may want to experiment with the cap values at one of the gyrators for a more effective separate Mid control. AMZ and Griffin Effects have very useful bandpass filter/gyrator calculators. 

Arion SMM-1 Metal Master

 Some says this is a HM2 killer. I don't know about that but it differs  enough circuit wise to deserve its own layout. Note that "Hard/Soft" switch is omitted as well as "Output 2" op amp circuit.

 

 

 

 

 

Factory schematic is a mess so I had to draw up a cleaner version. Electronic switching, buffered bypass and "Hard/Soft" switch is not included.

Yamaha SHD-100 Super Hard Distortion

 

DOD FX56 American Metal

 

Yerasov Gamma HM-3 Heavy Metal