The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 27, 1979
Filed:
Jan. 20, 1978
Donald C McKinnon, Cheboygan, MI (US);
Paul F Bruce, Cheboygan, MI (US);
Fox Valley Instrument Company, Cheboygan, MI (US);
Abstract
This specification discloses a timing control circuit for a strobe lamp used in adjusting the ignition timing of an internal combustion engine. The control circuit includes an ignition firing detector with improved noise immunity, and a calibrated control for setting a strobe flash for a predetermined deviation from ignition firing. The output signal of the calibrated control is coupled to a first amplifier to determine the slope of a ramp voltage in part determining the flash point of the strobe lamp with respect to ignition firing. The output of the first amplifier is coupled to a second amplifier which generates a ramp voltage at the predetermined slope above a diode forward breakover voltage at the input to the second amplifier. The voltage drop across the diode, prevents false triggering by noise with a magnitude less than the diode voltage even when the maximum amplitude of the ramp voltage is near zero.