Frequency to voltage converters

Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means

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Details

123102, 307271, 328127, F02M 3900, F02D 104

Patent

active

039658775

ABSTRACT:
A frequency to voltage converter includes an operational amplifier having its non inverting input terminal connected to a supply line which has a voltage intermediate a pair of supply terminals for the amplifier, a resistor connected in series with first and second diodes between the inverting input terminal and the line a first capacitor through which the input of the converter is connected to a point intermediate the diode and a second capacitor connected between the junction of the first diode and the resistor and one of the supply lines, a feed back resistor connected between the output terminal of the amplifier and the junction of the first diode and the resistor and a third capacitor connected between the output and inverting input terminals of the amplifier.

REFERENCES:
patent: 3512013 (1970-05-01), Calfee
patent: 3772533 (1973-11-01), Bruckner
patent: 3867918 (1975-02-01), Williams
patent: 3886921 (1975-06-01), Hafner

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