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Fundamentals
Voltage Divider
Ohm's Law
LED Series Resistor
Parallel Resistors
Power Dissipation
Filters & Timing
RC Time Constant
RC Low-Pass Filter
RC High-Pass Filter
LC Resonant Frequency
555 Timer — Astable
555 Timer — Monostable
Capacitor Impedance
PWM Duty Cycle
Op-Amps
Op-Amp Inverting Gain
Op-Amp Non-Inverting Gain
Power Conversion
Buck Converter Inductor
Boost Converter Inductor
LM317 Voltage Regulator
Linear Reg Dropout Power
MOSFET Gate Resistor
Dead-Time Calculator
PCB Layout
PCB Trace Width
Via Current Capacity
Trace Impedance
Thermal & Power
Heatsink Thermal Resistance
Battery Life
Digital & Interface
I²C Pull-Up Resistor
ADC Resolution
Wheatstone Bridge
Digital & Interface
I²C Pull-Up Resistor
Recommended pull-up resistor range for I²C bus.
f(x)
Rmax = tr / (0.847 × Cb)
Presets
I²C 100 kHz 3.3V
I²C 400 kHz 3.3V
Vcc
mV
V
kV
Rise Time
ns
µs
ms
s
Bus Capacitance
pF
nF
µF
mF
F
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