Patent ID: 6028516
Filing Date: 2000-02-22
Classification: G08B,H03K

Abstract:
A trigger circuit for triggering the operation of a system, the trigger circuit comprising:a light source coupled to a power source, supplying a first beam of light having a first frequency;a frequency altering device positionable to receive the first beam of light from the light source, the frequency altering device receiving the first beam of light and transmitting a second beam of light having a second frequency;a frequency sensitive component operable in response to the second beam of light having the second frequency, the frequency sensitive component being positioned to receive the second beam of light and provide a trigger signal, the frequency sensitive component including a photo-transistor sensitive to light including the second frequency and positioned to receive the beam of light from the frequency altering device, and a potentiometer and a Junction Field Effect Transistor JFET coupled to the photo-transistor to adjust the component to be sensitive to the second frequency; anda trigger coupled to receive the trigger signal and, upon receipt of the trigger signal, triggering the system.