Photoelectric Low-frequency Function Generator

Abstract

In this paper, a simple and inexpensive low-frequency function generator is described. This instrument consists of a rotary functional pattern, a photo-tube, a direct current amplifier, a speed reduction mechanism and a cathode follower output circuit. A rotating acryl tube a functional wave form "pattern" modulates a narrow light beam towards the photo-tube. This instrument is capable of producing any functional wave form with ±1% accuracy in frequency covering the range from about 0.01 to 80cps several applications of this device other than as a function generator are also described.