RC Filter Calculator (low-pass and high-pass)

Here is simple RC filter calculator for calculatie cut-off frequency of a low-pass and high-pass rc filter:

RC Filter Calculator v1.0

R =		Ohm
C =		Fahrad
f =		Hertz

low-pass filter is a filter that passes signals with a frequency lower than a certain cutoff frequency and attenuates signals with frequencies higher than the cutoff frequency.
high-pass filter is an electronic filter that passes signals with a frequency higher than a certain cutoff frequency and attenuates signals with frequencies lower than the cutoff frequency.

More about low-pass and high-pass filer can be found on wikipedia.

LM317 Constant Voltage and Constant Current Calculators

Here is two simple calculator's for calculating constant voltage and constant current with LM317 voltage regulator.

LM317 Constant Voltage Calculator v1.0

R1 =		Ohm
R2 =		Ohm
V =		Volt

LM317 Constant Current Calculator v1.0

R =		Ohm
I =		Amps