Documents Before Valve Amplification.pdf

Before Valve Amplification - Wireless Communication of an Early Era by Lloyd Butler VK5BR At the turn of the century there were no amplifier valves and no transistors, but…

Documents Infra-Red Lock-in Thermography A. Reichold M. Lefebvre 20 June 2000 Detect features or defects in a....

Slide 1 Infra-Red Lock-in Thermography A. Reichold M. Lefebvre 20 June 2000 Detect features or defects in a material from heat wave interference effects on the surface Potentially…