Ready References
Signal Conditioning and Data Acquisition Basics
Signal Conditioning and Data Acquisition Overview
Signal Generators and Their Uses
AAVSO Membership Information
Choosing Your First Telescope
Notes on the Construction and Design of Instruments and Apparatus
Further Reading on Fossils
Ready References 
Signal Conditioning and Data Acquisition Basics Signal Conditioning and Data Acquisition Overview Signal Generators and Their Uses 
Notes on the Construction and Design of Instruments and Apparatus