This calculator helps you determine Op-Amp gains and offsets. The output is limited to power supply -1.5V which is
only an approximation. This calculator will help you see the effect of adding offset to move a signal up
or down DC-wise. The input signal is fixed and operates about ground. the blue line shows the signal input
ground reference and the red line shows the output bias when the non-inverting input is referenced to ground.
Enter: Power (power supply voltage), Input (input sine level), R1 in ohms, R2 in ohms, and Bias V in volts, then
click "Go". The graph displays the input signal in blue and the output signal in red. The overall gain
is displayed in the Gain display box. The DC offset is displayed in the Offset @GND display box.
Volts Per Division
Power
Input
R1
R2
Bias V
Gain
Offset @GND
Find Resistors To Create Voltage Divider
This tool helps you find the resistor values you need to create a
voltage divider for a specified voltage (to within the selected result accuracy). Enter the
supply voltage in the V+ input and the voltage needed in the
V-Find input. Click Find to get the first found pair. Click Find Next
to search for subsequent resistor values. The Actual V display shows the
actual voltage the divider will provide. The Current display shows the
current consumed by the divider.
V+
V Find
R1
R2
Actual V
Current
Find Two-Resistor Parallel Equivalent R
Sometimes you need a resistor value you don't have in your drawer.
This tool helps you find the two resistor values you need to create a
desired third value (to within the selected result accuracy). Enter the
resistance to find in the R Find input
and click the Find button. To find subsequent equivalents press the
Find Next button.
R Find
R1
R2
Actual R
Find Comparator Resistors
This calculator helps you find the resistors you need for a
comparator when you know the V-Ref voltage, desired Hysteresis, and the V-Saturation
voltage of the Op-Amp. Enter the three parameters (V-Ref(erence) voltage, V-Hysteresis voltage, V-Sat(uration))
and click the Find button. To find subsequent resistor values press the
Find Next button. Please bear in mind that this calculator provides approximations.
It makes the assumption that the saturation voltage is symmetric (+ and -) which is usually not the case
but it will get you in the ball park. Op Amp current load also plays a factor in saturation voltage most op-amps
are rated for saturation voltage with a 10K load.
V-Ref.
V-Hysteresis
V-Sat.
R1
R2
Pos Thresh
Neg Thresh
Comparator Calculator II
This calculator tells you the characteristics of a comparator when you enter the
parameters shown (R1 value, R2 value, V-Ref, Positive and Negative Saturation Voltages).
