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usb e kits presents
online calculator,converters and generators

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candela to lumens converter

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This calculator allows you to do an approximate conversion between millicandelas (or candelas) and lumens!

Voltage divider calculator

This program calculates the missing parameter value.
Parametrs Input Voltage, R1 and R2,  Output Voltage.
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Common length and distance converter

Inches,mm,feet and other converter
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LM317/lm338/lm350 Voltage and Current regulator calculator

You can use this Voltage Regulator to calculate the output voltage for the LM317 / LM338 / LM350 family
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Led series/parallel array wizard

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The LED series/parallel array wizard is a calculator that will help you design large arrays of LEDs.

zener diode calculator

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an online zener diode calculator.
just enter the values needed and find the resistor and the zener.


helical coil calculator

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HELICAL COIL CALCULATOR


switching poer supplies calculators

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The calculators give suggestions for appropriate choking coils and high frequency  transformers.

hysterisis opamp calculator

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A simple online calculator for the hysterisis in an opamp as a comparator.

MC34063 step up , step down calculator

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Fill in the form and push "Calculate" to get an updated schematic

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