Daily Archives: September 12, 2009

Boss OD-1 Overdrive

OD-1 Over Drive (Boss)

This is one of the hundreds of pedals built around the JRC4558 operational amp chip and its variants. It has been built from 1977 to 1985. There are 2 controls: “Level” and “Over Drive”. Moreover, there are at least 5 versions of the circuit board: the first versions probably didn’t even use the JRC4558. This pedal isn’t particularly rare, even considering that has been out of production for more than 20 years, however it has a lot of fans. It has a pretty good sound when used to crank up a Marshall tube head, however may not sound so good with other amps. Building quality is standard Boss, which means they are built like a small tank. This was one of the first pedals to use FET switching instead of “True Bypass” switching: however I’m not sure if this can be considered as an improvement :) . The fact that 30 years later some pedals are still made in this kind of box means that the overall design was really good (compact size, easy battery access, anti-skid panels on top and bottom).


- Input Impedance: 220 kOhm

- Output Impedance: Over 600 Ohm

- Signal/Noise Ratio: 80 dB

- Current Draw: 3.5 mA

Samples coming real soon


OD-1 schematics and nice images – on fffworks site (text is in Japanese language)

OD-1 Schematics at Schematic Heaven: OD-1 schematics

Short description on Boss USA site

OD-1 on Boss USA site

And some videos from YouTube:

Video 1 (in japanese)

Video 2 (in japanese, too)

OD-1 mods from Analog Man