MXR
Discrete Distortion +
I’ve seen a few people playing around with discrete opamps in classic circuits, and thought I’d give it a go with one of my favorite circuits, the classic MXR Distortion + (or DOD 250, etc.). The typical 741 opamp has been replaced with Joe Davisson’s Diode-Compression Opamp. The 6.8k resistor in the bottom left corner … Read more
MXR Custom Badass Modified OD
Here’s another one I was surprised I hadn’t drawn up before. Like the Custom Badass ’78 Distortion, it’s also based on an old Boss pedal—the SD-1. (Or I guess you could say it’s a modified version of the Zakk Wylde Overdrive, but that’s based on the SD-1… Either way, it’s definitely been modified with the … Read more
MXR Micro Chorus
The originals used a now nearly unobtainable SAD512D chip, but the wizards on FSB converted it to work with an MN3007. Now that those are also hard to get a hold of, I’ve laid this out for an MN 3207–which is almost the same as the 3007, just with a slightly different pinout for power … Read more
MXR Commande Sustain
Here’s one from MXR you probably haven’t heard of before. It was apart of their Commande line of plastic boxed effects from the late 80s. They aren’t highly regarded because of the plastic, but the circuits were pretty well designed. The circuit in question today is a better design than the DynaComp, offering less distortion … Read more
MXR Custom Badass ’78 Distortion
I’ve wanted to draw this one up for a while. It’s a fantastic clone/variation of the Boss DS-1 Distortion. I had one for a while and loved it, but ended up selling it to fund some other stuff. But I’m definitely adding this one to the pile. You can sub a TL072 or JRC4558 in … Read more