Kevin Chen

Standard Resistor Value Finder Enter any resistance value to find the nearest E-series standard resistor. Target Resistance (Ω)

Shunt Resistor Calculator Calculate shunt resistance, power dissipation, and voltage drop for current measurement circuits. Maximum Current (I)

Pull-up Resistor Calculator Supply Voltage (VCC): 0?(v/(i/1000)).toFixed(2):0;var rmax=(c>0&&f>0)?(1/(2*Math.PI*f*1000*c*1e-12)).toFixed(2):0;var rec=(rmin>0&&rmax>0)?(Math.sqrt(rmin*rmax)).toFixed(2):0;document.getElementById(‘pu_rmin’).innerText=rmin+’ Ω’;document.getElementById(‘pu_rmax’).innerText=rmax+’ Ω’;document.getElementById(‘pu_rec’).innerText=rec+’ Ω’;” style=”width:100%;padding:8px;border:1px solid #ccc;border-radius:6px;font-size:16px;box-sizing:border-box;”> mA Line/Load Capacitance (C): 0?(v/(i/1000)).toFixed(2):0;var rmax=(c>0&&f>0)?(1/(2*Math.PI*f*1000*c*1e-12)).toFixed(2):0;var rec=(rmin>0&&rmax>0)?(Math.sqrt(rmin*rmax)).toFixed(2):0;document.getElementById(‘pu_rmin’).innerText=rmin+’ Ω’;document.getElementById(‘pu_rmax’).innerText=rmax+’ Ω’;document.getElementById(‘pu_rec’).innerText=rec+’ Ω’;” style=”width:100%;padding:8px;border:1px solid #ccc;border-radius:6px;font-size:16px;box-sizing:border-box;”> kHz R_min (Current Limit): 1666.67 Ω R_max (Rise Time Limit): 31830.99 Ω Recommended R: 7283.66 Ω Circuit Diagram VCCR_pull-upSIGNALIC/MCUOpenGND Common Pull-up Values Application Voltage Resistor I²C Standard

Motor Run Capacitor Calculator Motor Power (HP): 0?(hp*746)/e:0;var qc=pin*(Math.tan(Math.acos(pf))-Math.tan(Math.acos(tpf)));var c=(v>0&&f>0)?(qc*1e6)/(2*Math.PI*f*v*v):0;var i=v>0?(2*Math.PI*f*c*1e-6*v):0;document.getElementById(‘mrc_cap’).innerText=c.toFixed(2)+’ µF’;document.getElementById(‘mrc_qc’).innerText=qc.toFixed(2)+’ VAR’;document.getElementById(‘mrc_pin’).innerText=pin.toFixed(2)+’ W’;document.getElementById(‘mrc_ic’).innerText=i.toFixed(2)+’ A’;”> Frequency (Hz): 0?(hp*746)/e:0;var qc=pin*(Math.tan(Math.acos(pf))-Math.tan(Math.acos(tpf)));var c=(v>0&&f>0)?(qc*1e6)/(2*Math.PI*f*v*v):0;var i=v>0?(2*Math.PI*f*c*1e-6*v):0;document.getElementById(‘mrc_cap’).innerText=c.toFixed(2)+’ µF’;document.getElementById(‘mrc_qc’).innerText=qc.toFixed(2)+’ VAR’;document.getElementById(‘mrc_pin’).innerText=pin.toFixed(2)+’ W’;document.getElementById(‘mrc_ic’).innerText=i.toFixed(2)+’ A’;”> Current Power Factor (0-1): 0?(hp*746)/e:0;var qc=pin*(Math.tan(Math.acos(pf))-Math.tan(Math.acos(tpf)));var c=(v>0&&f>0)?(qc*1e6)/(2*Math.PI*f*v*v):0;var i=v>0?(2*Math.PI*f*c*1e-6*v):0;document.getElementById(‘mrc_cap’).innerText=c.toFixed(2)+’ µF’;document.getElementById(‘mrc_qc’).innerText=qc.toFixed(2)+’ VAR’;document.getElementById(‘mrc_pin’).innerText=pin.toFixed(2)+’ W’;document.getElementById(‘mrc_ic’).innerText=i.toFixed(2)+’ A’;”> Capacitance Required: 15.87 µF Reactive Power (Qc): 484.31 VAR Motor Input Power: 877.65 W Capacitor Current: 2.11 A

⚡ Capacitor Charge Time Calculator Capacitance (C) pFnFµFmFF Resistance (R) ΩkΩMΩ Source Voltage (V) Time Constant τ = RC: 1000.00 ms 1τ (63.2% charged): 1000.00 ms → 7.59 V 5τ (99.3% charged): 5000.00 ms → 11.92 V Full Charge Time (≈5τ): 5000.00 ms 📈 RC Charging Curve 100%63.2%0%1τ2τ3τ4τ5τV(t) = V₀(1 − e^(−t/τ))Time (t)Voltage 📊 RC