TPC-100 Texar Prism Clone

TPC-100 Texar Prism Clone

A modern reimagining of the legendary Texar Audio Prism multiband processor. Designed to preserve the character and functionality of the original hardware while simplifying construction, calibration, and long-term reliability.

Project Overview

Modernizing a legendary multiband audio processor

This is the project page for the Texar Prism clone I developed, which I designated as the TPC-100. The project began as a personal challenge to modernize much of the original 1980s technology while keeping the classic functionality intact.

The TPC-100 eliminates the use of aging and increasingly difficult-to-source LDR components while also reducing the extensive calibration procedures required by the original design. The result is a processor that retains the character and flexibility of the original Audio Prism while being far easier for hobbyists and experimenters to build and maintain.

For additional historical background on the original unit, Glen Clark's excellent article can be found here:

The Audio Prism Story

Building the TPC-100

Everything needed to construct your own unit

All files required to build the TPC-100 are available below, including PCB ordering links, firmware, build documentation, BOMs, and supplemental design files.

I still have limited quantities of bare PCB inventory available, however this project is being made openly accessible so builders can source and manufacture the hardware in whatever way works best for them.

The only potentially difficult aspect is PIC programming, but with a PICkit3 and MPLAB-X software the process is relatively straightforward.

Hopefully this design continues to find use in hobby broadcasting, studio applications, and audio experimentation for years to come.