Transistor analogue computing amplifiers for flight simulators

A WIDELY used flight-simulation method for flight trainers is the use of an analogue computing system employing a modulated 400-cycle-per-second (cps) carrier. A recent paper1 described four basic computing components that have been developed for use in computing systems of this type. Two of these components are vacuum-tube amplifiers. These are: 1. a summing amplifier of the voltage feedback type having a 1-per-cent accuracy of summation; and 2. a power amplifier for servomotor operation. This paper describes the design and characteristics of two transistor amplifiers that are directly interchangeable with these vacuum-tube amplifiers.