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 CTG (DIY version)

 Here we have a "little" monster layout for a DIY project that Dunwich Amplification just released at OSH Park. It is supposed to a emulate a part Al Cisneros of Sleep bass rig. It is basically three circuits in parallell, a DOD 250 Pre Amp, a Boss DS1 and a clean J FET boost with a James tonestack.

Schematic and BOM can be downloaded HERE.

 

 

GuitarPCB Plexi Plus

 This was a request. Based on Ramble FX Marvel Drive but with some tweaks.

Schematic and info HERE

Zvex Fuzz Factory

 How did I miss THIS one?😕😖

Dunwich Amplification Olde Dirty Bass - 125b/Custom version

 This one shares almost the same footprint as the earlier "Big Box" version but component values have been changed all across the circuit. No major changes except for the "bass boost" cap/resistor at the Cut switch and a few extra caps and resistors.

Schematic is avaiable at FSB.

 

 

Fulltone Secret Freq

 Based on schematic from PedalPCB.

Seppuku Fx Memory Loss - alike

 The layout is based on a quite diffucult-to-read schematic found at Mod Wiggler forum.

It may contain some errors and there are few question marks next to some of the pots and one of the caps, so some "trial and error" might be necessary to get this thing working as it should. Also, the "Filter" switch looks like a feedback switch for the LM386 IC and it appears to be a panel mounted push button switch but I guess a SPST toggle switch can be used as well.

 

 

Mid-Fi Electronics Pitch Pirate

 Schematic from the creator himself is avaiable at FSB.

Death by Audio Super Fuzz War - Fuzz section

 Deadend Fx just traced this rare beast and released a PCB for it. Go and get it!

If not, here is a couple vero layouts for the fuzz section. I will upload the Boost section once I can wrap my head around some of the switch connections....

There are two layouts, one stock the with internal 8-pole DIP switch and one with all switches converted into 8 external SPST toggle switches.

 Schematic HERE. 

Unverified stock version

 

Verified toggle switch version

 

 

 

Spaceman Effects Apollo VII Overdrive

 A bit modified compared to the schematic to keep it 1590B friendly. The relay bypass switching is omitted and so is the bicolour LED indicator. The circuit itself is quite "normal" compared to other Spaceman circuits and there is only one odd part; TLE2426 which is a precision virtual ground regulator. Layout is based on schematic avaiable at Deadend Fx.

Mad Professor Blueberry Bass Overdrive

 This is basically a higher gain version of BJFE Blueberry Bass OD since it has an added pre amp stage (Q1). Note that originals had the now obsolete BF244A transistors with DGS pinouts. I changed the pinouts for more accesible transistors. 2N5457s should bias up fine and sound good.

Paul Cochrane Timmy V3

 Based on schematic from PedalPCB

Paul Cochrane Timmy V1

 This one has been requested for a while. There seem to be several versions of this circuit so I guess we should start with V1? There is several schematics online, all of them have different wiring for the Bass and Treble controls. So the lug numbering may need some corrections.

Spaceman Effects Rumble Fuzz w. Deadend Fx "Gollum" mod

 The stock Rumble Fuzz suffered from not being loud enough. Dead End Fx decided to take care of that and added a J FET booster after the Volume control (it is labelled "Fuzz", not sure why....). 

The layout below is verified and this is now a loud, hairy, air moving fuzz indeed. I used a BC109C (hfe 650) for Q1 and a metal can 2N2222A (hfe 200) for Q2. 

Spaceman Effects Polaris Resonant Overdrive

 Had an unverified layout in the library that I was quite unhappy with so I decidied to give it another go with a new one from scratch. This is a soft clipping overdrive with a bass boost and cut filter. The eq / filter section are pretty unique with an OTA LM13700. With the Depth switch you can select between a simple one pole filer, a two pole filter and a resonant two pole filter. The Initial control lets you blend the clean overdive signal with the filtered signal.

Schematic from the wizards at Deadend Fx

 

 

 

 

 

Keeley Oxblood

 

 

 

Per request, here is the schematic.

 

 

BYOC Silver Pony V1

Dunwich Amplification Volt Thrower - Big box version

 A bit hesistant to upload this one since there is an unknown cap value and pot value. But a quite a few people have requested this one so I guess a 95% accurate trace is ok? 

Traced by evilarsen, AlexS and myself. It is a Rat based circuit running on 9v/-9v up to 18v/-18v. It is intended for bass but works equally well for heavy down tuned guitar playing. Tonestack is a passive James variant and there is an extra gain/makeup stage before the output. 

The diode selector rotary switch has a quite interesting configuration. Many of the diodes are stacked and are asymmetric. Probably the keep an even output level across the switching range?

 

Klon Centaur

 

Dan Armstrong Green Ringer

 This essential octave up circuit slipped through the net...