## Introduction

This calculator performs design calculations for the meter-driving current source used
by the **ShareBrained Chronulator** or
in the PLD Designs-produced ChronulatorSMD.

The circuit can be analysed—by checking the range that should be available given a set of resistor values—or can be designed by asking it to suggest values to use to drive a specific meter at a maximum PWM, and with a desired adjustment range.

**Note that the first two choices in the drop down list below are for the standard Chronulator
and the second pair of choices represent the “new, improved” ShronulatorSMD.**

For some thoughts on the design of the current source circuitry, see here.

Page visited: Tuesday, Jan 27th, 2015 at 8:48am PST. Last updated: Jun 22, 2012.