MXR
MXR: Phase 90
Bit of a classic guitar effect – the MXR Phase 90. Electrosmash has an excellent reference that covers all things Phase 90, including the schematic https://www.electrosmash.com/mxr-phase90. JFETS can be pesky, so make sure you match them as best as possible and buy from reputable suppliers. The script switch is strictly optional. It’s one of those things that … Read more
MXR: M-103 Blue Box
The MXR M-103 Blue Box is a sub-octave fuzz (two octaves down). It’s not a clean sub-octave either, pretty dirty really, well it’s a fuzz… kind of synthy on some settings. Might want to check how many 56k resistors you have before starting this. MXR BLUE BOX – VERO LAYOUT BLUE BOX OCTAVE MOD Same … Read more
MXR El Grande Bass Fuzz
Per request. Note that there is an option to choose between internal trim pot (as in original) or external potoentiometer for the Freq control. Freq switch is external and the MPQ3904 transistor array is replaced with ordinary 2N3904s. Schematic is avaiable HERE.
MXR Blue Box w. mods
Couldn’t resist to add another layout for the Blue Box since there is a bunch of mods online… Octave switch that toggles between stock two octave down setting and one octave down setting. Treble boost switch that lifts up 10nF low pass filter cap before the Output control. Should result in an overall brighter and … Read more
MXR: Distortion +
Something of a classic and many other designs are based on the MXR Distortion + so no real need for an introduction. MXR DISTORTION PLUS – VERO LAYOUT DISTORTION PLUS ANALYSIS There’s an excellent analysis of the Distortion + here on Electrosmash including a schematic (be prepared for some maths) Note that I have used alternate pot … Read more
