# Calculators

A collection of online electronics calculators written by Mads Barnkob.

• Transistor base resistor calculator with examples given for NPN transistors 2N2222, 2N3055, 2N3904, BC547, TIP31, TIP31A, TIP31C, TIP41, TIP41A, TIP41C and PNP transistors 2N3906.
• Tesla Coil MMC calculator for configuring multiply mini capacitor strings in parallel and series
• Capacitor energy calculator for energy storage in Joule and charge in Coulombs
• Helical coil calculator for Tesla Coil secondary or other single layer coil calculations
• Spiral coil calculator for Tesla Coil primary or other pancake coil calculations
• IGBT gate drive calculator with duty cycle, frequency and power consumption
• Snubber capacitor calculator for eliminating transients and switching spikes from parasitic inductance

### Transistor Base Resistor Calculator

To use the calculator for transistor base resistor values, Its IMPORTANT that you read the following. Transistor datasheet values First, calculate the current you need to pass through the transistor when its on, that is...

### MMC calculator MMC tank design calculator for SGTC, VTTC, DRSSTC and QCWDRSSTC Tesla coils. Results are guidelines to designing a MMC and should always be double checked in your final design! Most importantly is that voltage rating is the...

### Capacitor Energy Calculator To calculate capacitor charge in Coulombs and capacitor energy in Joule, enter the rated capacitance of the capacitor and the voltage it is charged to. Switch between the input fields to automatically calculate the values. Capacitor...

### Helical coil calculator

Here you can calculate the inductance for a given size of helical coil wound in one layer. It is optional to add the capacitance for f.ex. a primary tank capacitor or topload capacitance to find...

### Spiral Coil Calculator Here you can calculate the inductance for a given size of a spiral coil wound in one layer. Secondly you can to add the capacitance for f.ex. a primary tank capacitor or topload capacitance to...

### TL494 Calculator

This calculator will help you design a variable frequency oscillator. The TL494 IC is a versatile PWM control circuit in a single chip. This calculator will help you calculate the oscillator frequency from a set...

### IGBT gate drive calculator

Published on: Feb 17, 2016. Updated: Dec 06, 2017. To insure that we switch our IGBT fast enough to lessen losses, slow enough to avoid ringing and the drive circuitry is stable we have to... 