28119 Parallax Inc, 28119 Datasheet - Page 58
28119
Manufacturer Part Number
28119
Description
KIT UNDERSTANDING SIGNALS
Manufacturer
Parallax Inc
Datasheet
1.28119.pdf
(137 pages)
Specifications of 28119
Lead Free Status
Contains lead
Accessory Type
Oscilloscope
Interface Type
USB
For Use With/related Products
BASIC Stamp® 2 and Board of Education
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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Let’s calculate the time constant for a 220 Ω resistor and a 1µF capacitor.
The time constant is the time it will take for the charge curve of the capacitor to reach
63% of the applied voltage or to fall to 37% of the applied voltage. This may seem odd
until you consider the following images.
Consider the following example: If you applied 5 V to this RC network, it would take 2
ms for the charge curve to reach 63%, or 3.15 V. It will take approximately 5 times the
time constant (10 ms) for the capacitor to charge to 5 V. Provided you allow the capacitor
Where R is in Ωs
Where C is in Farads (1µF would be .000001 F, .1µF would be .0000001 F).
Time Constant is in seconds
Time
Time
Constant
Constant
=
0.00022
=
220
Figure 4-1:
RC network charge curve.
Note that the capacitor charges quickly at
first, then it progressively takes longer and
longer to completely charge.
Figure 4-2:
RC network discharge curve.
Likewise, the capacitor discharges quickly
at first, then it progressively takes longer
and longer to completely discharge.
seconds
x
0.000001
or
.22
ms
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