Can anyone explain to me how the 555 IC works in the Earth Measurements Project?
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Quite Confuses me, the capacitor is connected to 1(GROUND) and 2
(TRIGGER) the resistor is in 2(TRIGGER) and 3(OUTPUT), how do this do
the dsicharging and charging, and how this works?
(TRIGGER) the resistor is in 2(TRIGGER) and 3(OUTPUT), how do this do
the dsicharging and charging, and how this works?
Comments
>Quite Confuses me, the capacitor is connected to 1(GROUND) and 2
>(TRIGGER) the resistor is in 2(TRIGGER) and 3(OUTPUT), how do this do
>the dsicharging and charging, and how this works?
The output is inverted from the input: when the voltage on the cap is LO,
the output is HI and the cap charges thru the resistor. When the threshold
voltage is reached (2/3 Vcc), the output goes LO and discharges the cap via
the resistor.
Its similar to the standard circuit but requires 1 less resistor and can
provide a more accurate 50 duty cycle *IF* the '555 is one of the CMOS
variants.
dwayne
Dwayne Reid <dwayner@p...>
Trinity Electronics Systems Ltd Edmonton, AB, CANADA
(780) 489-3199 voice (780) 487-6397 fax
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