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Welcome DIY People!
• Drive Bastard - High Gain Overdrive pedal project. The Drive Bastard is an High Gain Overdrive project based on the LM741 single OP Amp IC. I choose the inverting input since they are not as usual as the non-inverting circuits. This is a 3 knobs pedal (Drive - Tone - Level), drive control can be adjusted from... more • RollFuzz - One 2N5088 transistor simple fuzz pedal. The RollFuzz is a One 2N5088 transistor simple fuzz project with only one pot control (Level) that let you adjust the final effect volume. Fuzz is controled by rolling back the volume knob on the guitar. An extra pad has been added on the layout to let you... more • 3 Little Pigs - Medium Gain Overdrive pedal project. The 3 Little Pigs Overdrive was created because I was missing a tone that would be more "tubey" than the conventionnal overdrive circuits using an Op Amp as the main amplification/clipping stage. The J201 JFet has been selected since they are known to have the higher gain of all but also because they can deliver a sound very close to a 12AX7 tube... more • MuffRat - Distortion pedal project. The MuffRat Distortion is a simple distorted effect generated within 2 stages : - A slightly overdriven 2N3904 NPN transistor input buffer inspired from the Big Muff PI. - A highly distorted stage using one side of a dual TL072 OP amp IC. With no LED at first clipping stage it reminds the fat saturation... more * You are allowed to download or save material from this website exclusively for private, non-commercial use and for the purpose of creating the projects. ** Circuits nor Schematics can be completed or not, as long as they are originals (no BYOC) and completely free to download.
• Big Muff Op Amp 1977 Back in 1977, the Big Muff then had other electronic components than conventional transistors, these were operational amplifiers, so called Op-Amp or simply IC (integrated circuits). These components gave a particular sound to the famous Fuzz / distortion pedals produced by Electro-Harmonix...Below are the schematic and vero layout of the early 1973 version, which doesn't have the tone switch. Note that the proposed version include a slightly modified power supply filter section, this doesn't affect the sound but only gives a quieter circuit... more • Tube Screamer TS-808 Here is a proposed Tube Screamer TS-808 schematic drawn without the FET bypass section. I did my best to respect as close as possible the original parts... more • Most popular Op Amp IC chips for diy pedals As I started to built diy guitar and bass pedals I was always wondering about which op amp IC chip was the most popular and used, here's a short but still useful guide... more • Boss OD-1 With Tone Control Came out in 1977, the original Boss OD-1 was surely the first "tube screaming type" Overdrive pedal... It is quite a simple circuit on which many other was inspired from, just like Ibanez with the Tube Screamer. In 1985 it was discontinued to make room for the SD-1...so I drew the schematic based on the pcb in my pedal and also did some nice layout / veroboard. This OD-1 workalike stompbox really is a favorite of mine... more • Marshall Drive Master with BluesBreaker Tone Control Here's a circuit I built years ago, the Marshall Drive Master modified with a BluesBreaker Tone Control, making the pedal 3 knobs instead of 5. Everybody knows about the sound of a cranked Marshall JCM800, the Drive Master is basically a JCM 800 in a box...this pedal is for sure a favorite of mine. You know that I don't like pedals with too much knobs but I swear its not the only reason that I love it... more • Boss Input / Output Buffer Here's a Boss Input / Output Buffer that sometimes I found to be quite useful, when activated it does the same as a Boss stompbox on its off position, in other words it's like when the effect is turned off and the signal is passing only through the input / output buffers...for a reason over my knowledges sometimes these Boss buffers are making some stompboxes or amplifiers to sound better than other buffers... more • Unicord / Univox Super Fuzz - modifications here I am with a great circuit, the legendary Univox Super Fuzz...the best solution is to wire a smaller-value capapacitor in parallel with the 0.1 uF (I end up using a .022 uf), both caps are then connected at one end to the junction of the 10k and 22k resistors. At the other end, each cap are connected to an outside lug of a B10K pot, then the wiper of the pot goes to ground. Rotating the pot in one direction or the other makes the series resistance for one cap higher and the other lower, this yields two different flavours of mid-scoop and variable midlift... more • Rostex Turbo Metal - No sound at the output fet Here's another really good sounding circuit, the (discontinued) Rostex Turbo Metal (1991)...Drain voltage is correct but no signal is passing through the FET. No worries...I can find the problem and realised that the gate wasn't properly biased, so I just added another 1M resistor from Drain to Gate on the FET and Banggg !! Everything works as it should... more • NPN Silicon Fuzz Face The Fuzz Face, first issued in 1966 by Arbiter Electronics Ltd, is probably the most famous fuzz used by many guitarists like Jimi Hendrix, David Gilmour, Jack White from The White Stripes, Dan Auerbach from The Black Keys and many more. It was only in 1993 that Dunlop Manufacturing took over the production, making a variety of Fuzz Faces to this day. Some germanium and others using silicon transistors for more stability... more • Big Muff Ram's Head Violet V2 - 1st version 1973 The Ram's head is a legendary model of Big muff. This is the second version released after the triangle in 1973...Technically, the big muff is not a fuzz but a distortion. However, unlike others, it has 2 successive stages of distortion, which generates the so saturated and compressed sound of the big muff, ultimately making the sound close to the sound of a fuzz...Below are the schematic and vero layout which can be used as reference or to built your own clone of this legendary pedal. more
• DIY battery pack to power pedals If like me you got really tired of these 9V square batteries always been discharged so fast, here's a very cheap DIY battery pack to power all of your pedals. This thing is also nice to power your breadboarded projects. more • Pedal circuit tester Most of the time I test circuits on my big breadboard, sometimes not, but even if I have this complete breadboard sometimes I'm missing space. Here's my little pedal circuit tester so I can quickly power and test my circuits without having to solder jacks, footswitch, DC jack, etc. It can also be used to test a circuit in the chain with other pedals. Sometimes I have to use a plain breadboard (like in the image below), so I can quickly hook it on this pedal circuit tester the same way, that's a useful thing for me. more • Combo 12V / 9V Regulated / Filtered Power Supply Here's a DIY combo power supply I built using a 7812 and 7809 regulators to feed my guitar and bass pedals with constant, filtered and regulated voltages, both 9 and 12 VDC can be used simultaneously....That's an easy project but such a device can also be quite useful to power breadboarded circuits or any other tools requiring regulated and filtered voltages. I built mine with banana jacks so I can probe current and voltage drop directly from the unit. more • DIY Frequency Generator My DIY Frequency Generator that I built some times ago. A very cheap and useful project, powered on regulated 12Vdc, 1/4 and BNC output jacks, the big black knob at the top center is a 3 way selector to change frequency ranges (20Hz to 100Hz / 100Hz to 1Khz / 1Khz to 10Khz), toggle switches from left to right are: amplitude boost / square / sine & triangle, and the knobs at the bottom are: amplitude, coarse and fine adjust...Even if it's for troubleshooting DIY pedals, amplifier circuits or for tweaking your breadboarded projects, with this Frequency Generator it's easy to inject a sine wave, at an amplitude from a few mV up to 935mV. The signal can be traced by using an oscilloscope, or it can be heard by using a DIY audio probe. more • DIY Breadboard A breadboard is very usefull for prototyping, because it does not require soldering, it is reusable. This makes it easy to use for creating temporary prototypes and experimenting with circuit design. Now, this little tool can be upgraded to be more suitable for guitar pedal prototyping... more • Homemade Audio Probe for debugging DIY pedals As most of us DIY pedal builders, sometimes we have to improve circuits, make modifications, or try to find bugs, so we have to get something to be able to trace the audio signal. Unfortunately an oscilloscope is not an accessible tool for everyone. Here's a simple homemade audio probe for debugging DIY pedals, which will let you trace the audio signal but will also let you hear it from different parts of the circuit. more
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