This is a great sounding wee distortion/overdrive pedal, perfectly balanced EQ for full overdrive/distortion response for one-knob use. This is the one I used to make the acid etching tutorial which you can see below in the videos.
I call it distortion because technically it hard clips, but it is more an overdrive.
Responds well to your guitar volume and tone pots, give it a wee boost from the front and it goes into distortion territory.
This is a basic yet beautiful circuit, it has the full body overdrive that you get from an amp thanks to the Germanium diodes that do all the work after the transistor circuit massively boosts signal.
Dial your guitar volume back and go into edge-off breakup and dirty clean territory.
Due to its full range you can really drone and sustain with this pedal all day long.
See this one being made: