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Design Theory

I have automated a number of tedious but useful calculations for electronics. Use these interactive online web-calculators to save you time. I will keep adding them as time goes on.

Resistor Noise

Resistance: kohms
Temperature: C
Bandwidth: kHz
Noise: Vrms

Microstrip Transmission Line Impedance (based on old formulas)

Dielectric constant:
Trace thickness:
Trace width:
Height over ground plane:
Frequency: GHz
Impedance: ohms
Propogation delay: ns/ft
Quarter Wavelength: inches

Passive Low-Pass Filter

Type:Bessel Butterworth
-3dB Frequency:kHz MHz
Resistance: ohms
Ca: F
La: H
Cb: F

7th Order "Hagerworth" Low-Pass Filter

-3dB Frequency:kHz MHz
Resistance: ohms
C: F
L: H

Passive Band-Pass Filter

Lower -3dB Frequency: kHz
Upper -3dB Frequency: kHz
Resistance: ohms
C1: F
L1: H
C2: F
L2: H

Passive 2-Pole Low-Pass Filter

-0dB Frequency: kHz
Resistance: ohms
L: H
C: F

Choke Filtered Supply

Step 1: Enter load voltage and current to determine minimum required inductance for continuous current operation (60Hz full-wave rectification).

Load Voltage: V
Load Current: mA
Minimum Inductance: H

Step 2: Enter actual value of choke inductance and it's internal equivalent series resistance (ESR) to determine minimum required capacitance for damped operation. Note, adding external resistance in series with the inductor lowers the required capacitance.

Inductance: H
Resistance: ohms
Minimum Capacitance: F

Step 3: Enter actual value of capacitor (in uF) to determine resulting output ripple voltage.

Capacitance: uF
Output Ripple: V

Step 4: Required input voltage from transformer secondary is:

Input Voltage: Vrms