PWM Generator EK010

EK010 is an oscillator built around an OP-amplifier. The oscillator has simultaneous triangle and square wave outputs and the square vave has an adjustable pulse width from 0 - 100%. The pulse width can be controlled using the on-board potentiometer or an external voltage between 0 and 10V. To limit the range of the PW potentiometer, increase value of resistors R10 and R11. The frequency is adjustable from 300Hz to 3kHz. For greater frequency range, replace the 100k potentiometer with 1Mohm. If lower or higher frequencies are required, replace the timing capacitor C1 with a smaller or larger value. The outputs are protected with 1kohm resistors, which also sets the output impedance. This kit alone is not suited for driving motors or LEDs directly, but when combined with kit EK010b, it can be used for driving loads up to 24V 5A. To use this kit for audio purposes, a series capacitor should be mounted on the outputs to eliminate the DC offset.

* Supply voltage: 12-24VDC * Current draw: 10mA (@12V)
* Frequency range: 300Hz - 3kHz
* Pulse width: 0 - 100%
* External CV: 0 - 10V (@12V)
* Dimensions: 45.72 x 40.64mm * Mounting holes: c-c 40.64 x 35.56mm, ø2.54mm