Edit:If you increase the input capacito (the 100n capacitor) more bass frequencies can flow through the common emitter amplifier, causing more of the distorted effect.
Also, if you change the bias of the transistor (swap the 100k Resistor for a much higher value, e.g. 680k or more, the transistor will be forced to asymmetrically clip, increasing the distortion. Go to the last page for sound clips :)
In my new circuit, I use a 470k resistor for the bias resistor.
AGAIN! A problem arises at the cost of extra distortion. The attack of the instrument may get chopped off(silenced in this case). With my bass, this only seems to happen when I am using the slap bass technique.
Step 1: Find the Parts!
The input and output capacitors depict the frequency response of the circuit e.g. The lower the input capacitor, the more bass is cut. This is good if your looking for a nice Trebly overdrive. Otherwise, this capacitor can be increased to any value. The values of these components doesn't particularly matter if your just looking for a simple distortion circuit.
The 100Ohm Resistor that is just above the Diodes can be removed to make the output wave much 'Harsher'.
The 100K resistor at the base of the Transistor mainly depicts the gain. Increasing this resistor increases the gain up to a certain point (It changed the bias of the transistor).
Edit: I have now included my new circuit diagram for the much more RAW! Distortion. Go to the last page for sound samples!Unfortunately, with this new circuit, the distortion isnt so epic at 1.5v :(
For this new circuit, i used a BC337-25, a much more gainier transistor.
Step 2: Build the Product
Step 3: Final Product
Step 4: What Both Versions Sound Like
The reason that the amplitude is lower on the second sound clip, that is because that was my bass clean through my amp. No volume changes or moving away the microphone. My setup was the same for each recording. The amplifier was on:
For both recordings.
My bass used was a Warwick Rockbass Streamer 2P'up Version.
Edit: On my new recordings, the moded circuit is used. I will include both a bass and guitar recording :) (excuse my TERRIBLE guitar playing :P)
My amplifier was recorded with a simple condensor module through using Audacity :)
Same bass, Guitar is a: Cheapo Spider Fender copy (I play bass not guitar!)
The files: "Guitar file" and "Bass File" Are the new versions :D