The FT4 Treble Boost Filter is finally available. Check it out on the Filter Modules page. I will be adding a "Full English" preamp...

The photos are old, that will take a while to update. Thanks for your patience!

The only failure customers (2) have experienced were broken pot shafts from over-tightening their Pot Nut on CF2 pots. I can't make the...

The site is being updated with the new 4th generation products. I will be rebuilding the complete system choices soon, but the new...

After months of experimentation and testing, the FP4 is ready and available on the store! Read about it on the filter page. Here are some...

PD4 Dual Preamp - I am heavy into the design of the new preamp. New features are: Dry signals from the pickups can be sent to a high pass...

I just received the first batch of custom concentric potentiometers that can be used for frequency and Q on a variable filter, or...

I shaped and polished the new prototype bridge a little. It works even better than expected! Loosen one screw to adjust intonation on two...

By popular demand, the FV1 Filter (Alembic style variable Q) has been updated with a bypass switch connector. While it is possible to...

After long hours of experimentation, I finally have a parametric filter setup that is way cool. My early efforts focused on separate...

I have updated the example preamp systems, hopefully they will be a little easier to navigate. All of the potentiometers have been...

Built and tested the first FP1. The chart shows the frequency response at various settings. I'm SUPER excited! The sound is really great,...

The prototype FP1 filter PCB is out for fabrication. I am uber excited about this filter. It's a parametric midrange control, very...

Since the connecting cables are fairly expensive, I changed the filter and control modules to have options for no cables, 50mm, or 100mm...

The PS3 is out for fabrication, soon to be tested and released. It will be about 19mm x 29mm, and use around .75mA of battery power. It...

We now have a Volume push-pull switch for filter bypass. It is available in push-for bypass or pull-for bypass variants. It has a...

Here's a nutty example of what you can do with just a single filter (like the PD3 Jazz Style system).

This video by JWC Bronski is a great demo of the fundamentals of filter preamps. The preamp in the video is a switched resonant type,...

All of the modules and connections have been reworked, and there are now four filter modules to choose from. Boards are at the fabricator...

While waiting for FV2 boards to come back, I did a major redesign of the PD preamp. Electronically, it is nearly the same as the PD2, but...