Monthly Archives: September 2009

Boss CS-1 Compressor

CS-1 Compression Sustainer (Boss)

This is the first compressor from BOSS: it has 3 controls, two knobs for level and sustain and a normal/treble switch, which is somewhat unusual from this manifacturer. I think that the only other Boss compact pedal which has a switch like this is the TW1 (T-Wah or Touch Wah).

This unit has been sold from 1978 to 1982, later Boss has made the CS-2 and CS-3. There’s a considerable difference in sound between the CS-1 and its siblings from the same company: this is due to the use of a photocoupler, which has been replaced by a more conventional VCA circuitry in later models. The CS-1 is supposed to have a tighter compression than CS-2 and 3. The pedal in the photo has some wear but still works like a champ.

Samples coming real soon

Schematics from Kurt Godiksen great site.

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