An inexpensive, high performance pulse-height readout system for proportional chambers

We describe a simple system to read out pulse-height information from a large number of proportional chambers. Its main features are simplicity, low noise, and wide dynamic range. A complete system with 6000 channels was built for less than $7 per wire, including fabrication and cabling. Typical readout time is <6 ms. The readout is designed to be triggered externally.