If you are looking for a guitar signal booster that is not entirely clean and can add some grit to the sound, then you should consider the new Dirty Boost, which can be built on the AMZ Multi-Purpose pcb.
The circuit adds low level harmonics (predominantly even) to the boosted guitar signal. If you drive the booster hard enough, it will produce a mild overdrive effect with a range of harmonics.
Anyone who has already purchased the Multi-Purpose pcb can review the instructions page for the latest update with this new circuit.
OCT Distribution has released a new module based on the FV-1 delay chip. It comes pre-programmed with 8 reverb and delay programs. This module would be easy to integrate into a guitar amp or even a pedal. Check it out:
The AMZ V-Dub pc boards have arrived. This is an updated circuit for a 9v-to-18v converter that has more features and improved design. The old V-Dub articles can be found 
While reviewing some very old schematics in a notebook I found stored in a box in my barn, I realized that the new multi-purpose opamp pc board could be used to make a fuzz box with many of the characteristics of the old MXR Distortion Plus, or the EH Muff Fuzz. I have now added the parts list and schematic to the info that is sent to everyone who orders one of these boards:
