Calculate voltage, resistor values, or division ratio for resistor divider networks.
Convert 5V logic signals to 3.3V for microcontrollers. Example: R1=10kΩ, R2=20kΩ gives 3.33V output.
Scale higher voltages to ADC input range. Measure 0-24V with a 3.3V ADC using proper divider ratio.
Divide battery voltage to measurable range. Use high-value resistors to minimize current drain.
Set DC operating points for transistor amplifiers. Create stable bias voltages from supply rails.
Variable voltage divider for volume control, dimming, or adjustable reference voltages.
Set gain in op-amp circuits. Determine output voltage ratio in switching regulators.
The load impedance affects output voltage. For accurate division, load impedance should be at least 10× greater than R2. Use a buffer amplifier if needed.
Choose resistor values high enough to limit current and power dissipation. For battery-powered devices, use 100kΩ+ to minimize drain.
Use 1% tolerance resistors for precision applications. Temperature coefficient affects accuracy in varying conditions.
Parasitic capacitance limits high-frequency performance. For AC signals, use lower resistor values or add compensation.