Project description
This unverified layout is based on this schematic by fredjuh.
Possible tweaks:
R1: Bias resistor that controls clipping behavior.
R3: Bias resistor that controls clipping behavior and low frequencies.
R12: Bias resistor that controls clipping behavior and gain.
R15: Lower to 50K or increase to 220K. Major influence on clipping.
R14: Major influence on gain and clipping of the JFET.
C1: Low end amplification.
C2, R5: High pass filter. Decreases highs and mids to increase low response.
C3: Determines the "fizz" in the overdrive.
C10: High end amplification and gain.
For use with a clean amplifier: reduce C3. If your (tube) amp will oversaturate: remove C2 and R5.
List
Click here to see the bill-of-materials as a list or download it as a comma separated values file (.csv).
Code
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Comments
n00b question
Submitted on November 16th, 2012 by AnonymousYou mention a possible mod for several resistors. Let's take R1 as an example. Would such a mod entail changing the value of R1 to for example 100K? Or even 22K? Is that what will influence clipping behavior? Or do I fit a 50K pot?
Experiment!
Submitted on November 16th, 2012 by AnonymousAt this point, I can't tell you anything other than to 'experiment' with it! I built it once, it works fin, but came to a conclusion I like diode/opamp clipping more ...
The effect eventually got recycled ;)
Experiment it is!
Submitted on November 16th, 2012 by AnonymousThanks. I was just asking to make sure I wouldn't cause a ThermoNuclear meltdown... ;)
this looks awesome
Submitted on January 13th, 2011 by AnonymousDo you have any sound samples of this? Is it kind of like a fuzz and tube overdrive combined?
I have been trying to build a Valvecaster today, but I am still waiting on for the correct parts to arrive in the mail. I hope I can figure out what I am doing wrong with a larger breadboard.