PWM with 74logic

I never have luck with 555 timers so I got into looking for a alternative solution. A friend told me to use a gate clock setup but that wouldn’t work so well from my research but I came across a robotic website on a simple schematic for a 74logic 7414 hex schmitt-trigger inverter. Uses less parts then a 555 PWM controller and has a better duty cycle range. Just need to toss on a fet or resistor on the base, ground out the emitter and send the pulse to the collector. I could even make this work on a extra pin on a ULN2003 to save space.

PWM side

PWM output to motor.

Quick example if I wish to use the ULN2003 instead since I would have three unused I/O on my CNC project controller board that I attend to use this circuit on.


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s