The M-104 MXR Distortion + aka Distortion Plus aka D+ is a distortion guitar pedal designed by MXR and released between 1978 and 1979. This kind of cap is used in many other similar pedals like the Boss DS-1 (using a 2K2 resistor and a 10nF cap ), the Pro-Co RAT (using a 1.5K resistor and a 3.3nF cap). The MXR Distortion+ was my very first pedal back in 1979 so I really dig hearing this sound again. MXR Distortion Plus US$ 8.00 The virtual ground created (+4.5V) will have a 1M//1M = 500K. People also try other popular germanium diodes, like the 1N34A (, These germanium diodes have a small forward voltage (Vf=0.3 to 0.45V) and a, The 1nF C5 cap placed in parallel with D1 and D2 is used to filter out the harsh high harmonics. The Aphelion Distortion project is a clone of the MXR Distortion+ and DOD 250+ Overdrive, which are essentially the same circuit with a few different values. They are the most important factor for the distortion sound signature. This big amount of Gain may lead us to think that the op-amp power supply rails may clip the guitar signal. Buy a DIST Complete Kit. a dyna comp-rehensive history. To do this a series of caps are used to create filters that shape the frequency response like the graph below: Some other distortion pedals in the same Distortion + category show a mid hump relatively similar: the Tube Screamer at 723Hz, and the Pro-Co Rat at 1KHz. var prefix = 'ma' + 'il' + 'to'; MXR released a simple hard clipping device called the “Distortion Plus” in the late seventies. mxr ®: the rackmount era. The (+) input of the op-amp (pin 3) is biased to 4.5V through the R, As a rule of thumb, the input impedance of a pedal should be 1M. The MXR Distortion + Operational Amplifier: The 741. The jacks and potentiometers are hand-soldered to the board, which makes it quite labor intense during production. Order Printed Circuit Boards. MXR Diagrams, Schematics and Service Manuals - download for free! The Distortion Plus pedal is very popular and good sounding distortion. Jim Dunlop bought the MXR licensing rights and currently manufactures reissues of this classic MXR distortion effect (with a power jack and an LED). Several capacitors C1, C2, C3, and C4 will filter the guitar signal as it is explained in the Frequency Response Section. The original circuit is built on a single layer creme colored PCB, this PCB material was extensively used by MXR. This was a dual purpose pedal back in the day because I connected it to the auxiliary tape input of a Teac reel-to-reel for some out-of-this-world space feedback effects. The noise in this part is pretty high (there are no noise specifications in the datasheet), the slew-rate is slow (0.5uV/s) which cannot cope with the audio band (up to 20KHz) but this is not necessarily a bad thing. This email address is being protected from spambots. The Three knobs were all familiar, but how did you discern how the classic distortion was different from the Plus, or III. This low Vf will add extra compression to the distorted guitar signal. 0000095954 00000 n 0000000016 00000 n Add an SPST switch around C3 to add more bass by adding a .33uf cap in parallel with C3. This type of topology adds a hard clip distortion, making the audio signal to clip with a hard knee which creates a strong distortion. Includes all the parts and materials you need to build one, all for about the price you would pay for a PCB and parts. To put it in context, other modern bipolar op-amps like the 4558 have a slew rate of 1.7uV/s (3 times faster than the 741). This type of topology adds a, Ω is a pretty standard value, other pedals like the. MXR Distortion + Analysis The M-104 MXR Distortion + aka Distortion Plus aka D+ is a distortion guitar pedal designed by MXR and released between 1978 and 1979. You need JavaScript enabled to view it. Since taking this picture I've added 2 new MXR knobs. The resistor R5 and C5 form a low pass filter with fc= 1/(2 x π x R5 x C5) =15.9KHz that will mellow the severe clipping applied by the diodes. The Distortion knob pot (CTS) date code says 1378049 and the Output knob pot says 1378012. Recently I've found myself with the Prime Distortion and some time, so I got know just what makes this pedal "prime". Other mythic op-amps like the LM308 used in the Pro-Co Rat is even slower (0.3uV/s) and seems to contribute in a positive way to the distorted sound. phase 95: the next phase. MXR Distortion Plus Schematic. Status VERIFIED. The original stompbox did not have external power jack or indicator LED. The Distortion+ first came out in 1973 and the DOD 250 followed in 1976. mxr® carbon copy® mini analog delay: a little delay. 3. fc5 = 1 / (2 x π x 10KΩ x 1nF ) = 15.9KHz. The voltage gain is defined by the non-inverting operational amplifier and calculated as follows: Gv(min) =  1 + (1MΩ/ (4.7KΩ + 1MΩ)) = 1.5 (3.5dB), Gv(max) =  1 + (1MΩ / (4.7KΩ + 0Ω)) =  213 (46.5 dB). 1.2 Op-Amp Amplifier Stage     1.3 Clipping Stage. 0K potentiometer which bleeds part of the input signal to ground. This kind of cap is used in many other similar pedals like the, Some other distortion pedals in the same Distortion + category show a mid hump relatively similar: the, from the (-) input to ground act as a high-pass filter. We took a classic distortion circuit and hot-rodded up at the first shadow of an excuse. When Dunlop took over MXR, the PCB was redesigned using a more modern approach to the board: the power connector, LED, jacks and potentiometers are directly mounted on the PCB, making it easier/cheaper to be mass produced. Other mythic op-amps like the, In the Distortion + different flavors of the 741 were used during its life, the. It is strikingly similar to the DOD Overdrive 250 distortion pedal. It does not feature a Tone control. fc3(with MAX Gain) = 1 / (2 x π x (4.7KΩ + 0Ω) x 47nF ) = 720Hz, fc3(with MIN Gain) = 1 / (2 x π x (4.7KΩ + 1MΩ) x 47nF ) = 3Hz. The big 1uF C4 cap between the Op-Amp Stage and the Clipping Stage will remove DC voltage, it is big enough so any amp or pedal connected to the output of the Distortion + will have an impedance big enough to not affect the frequency response. They are the most important factor for the distortion sound signature. You need JavaScript enabled to view it. A true classic! addy973d987cd4b7bf54b54b6928628d7661 = addy973d987cd4b7bf54b54b6928628d7661 + 'electrosmash' + '.' + 'com'; In the Distortion + different flavors of the 741 were used during its life, the LM741CN operational amplifier that was later changed to a UA741CP and many others ( JRC741, LM741, etc ) players seem to tell difference between the old original op-amps and the new models. Here is a picture of the PCB trace side. The 1nF C5 cap placed in parallel with D1 and D2 is used to filter out the harsh high harmonics. Thanks for reading, all feedback is appreciated. The humpy shape of the graph is explained in the Frequency Response section. I never quite understood their line up. It is the version before they added the LED and power jack. In the Distortion + the output impedance is calculated as: note: The output impedance of the 741 operational-amplifier is around 75 ohms. So the frequency response will slightly change with the gain of the pedal, with maximum gain (RV=0Ω) the bass will start to roll-off at 720Hz, this is why if you look at the hump, from 0 to 720Hz the shape is steeper as the gain is higher. The Frequency Response shows a classic lead guitar distortion pedal, this is a mid hum on the 1KHz region that helps to the guitar to lead over the band mix. In the graph above you can see the difference between using or not this 1nf cap in parallel with the clipping diodes.

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