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Op-amp gain
Op-Amp Gain Calculator (inverting, non-inverting)
Calculate the gain and dB of inverting and non-inverting op-amp circuits from Rf and Rin.
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Ohm's law
Voltage, current, power
LED resistor
Resistor by LED color
Voltage divider
Suggests R1/R2 for a target
555 timer
Frequency, duty cycle
Battery life
Including sleep current
Color code
3–6 bands, both ways
