In this series of articles I cover building a simple JFET booster based on Fetzer Valve effect. Another simple build, but this time based around JFETs.
Here’s how the final result looks like:

Articles covering this build are:
- Breadbording the effect
- Getting to know the effect
- Measuring JFET parameters
- Determining the final schematic
- Analysing it in SPICE (and more)
- And finally breadboarding it and trying it out
- Improving and assembling the pedal
- Design additional boost to make it a booster
- Finalize the schematic and the BOM
- Finished enclosure
- Hand painted with paint markers
- Soldering and assembling the pedal
Pedal in action: