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Abstract

Analog RPM limiting circuit for use with various types of ignition systems, employing a temperature stabilizing transistor Q3(6) configured as a single junction with biasing resistor R1a(7), a transistor Q2(5) used as a voltage threshold as well as a rapid timing capacitor recharging switch with a regenerative loop supplying bias to an associated regenerative capacitor charging switch Q1(4) constituting a mono-stable multivibrator, with a manual switch S1 for selecting timing capacitors for scaling the timing period according to the number of cylinders, and with another manual switch Q2 for selecting timing resistors for user adjustable RPM limit range, and Q1 and Q2 also used for imput triggering and output signal inhibition to provide the RPM limiting function. An improved, simple, low cost, temperature stable full featured analog RPM limiting circuit for use with various types of ignitions, integrated within or external to ignition systems, employing a temperature stabilizing transistor Q3(6) configured as a single junction with biasing resistor R1a(7), a transistor Q2(5) used as a voltage threshold as well as a rapid timing capacitor recharging switch with a regenerative loop supplying bias to an associated regenerative capacitor charging switch Q1(4) constituting a mono-stable multivibrator, with a manual switch S1 for selecting timing capacitors for scaling the timing period according to the number of cylinders, and with another manual switch S2 for selecting timing resistors for user adjustable RPM limit range, and Q1 and Q2 also used for input triggering and output signal inhibition to provide the RPM limiting function.

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First Claim