Here’s a handy list of calculators and resistors selectors from our friends over at CEPD.
There is a 1% resistor finder, resistor divider, resistors in parallel and RC time constant calculator found in the Resistor Calculators.
There are microstrip impedance and differential impedance used for USB
traces found in the microstrip
There are line of sight VHF, power conversion and VHF signal loss found
in the transmission
Time Conversion Calculators
time formats that can be found in the time conversion
Splitter and Attenuator Calculators
Find resistor values for Y splitter, T attenuator or Pi attenuator that
can be found in the splitter
and attenuator calculators.
Power Conversion Calculator
Conver voltage, dBm, dBu, dBV, or power to another form for a given
impedance and waveform type in the power
ASCII Character Chart
Character Chart that shows the symbols, hex values, octal
values, decimal values, binary value and description of the character.
EIA232 Reference Chart
Chart that shows the pinout and signal names for DB25, DE9,
and RJ45 connectors.
1st Order Filter Calculators
Filter Design for lowpass and highpass filters. The
calculators create analog component values, analog and digital filter
2nd Order Filter Calculators
2nd Order Filter Design for lowpass, highpass, bandpass and bandstop filters. The calculators create analog component values, analog and digital filter coeffiecients.