Dual PWM

[bryce10110]

Hey, I'm working on a project and would like to know if this circuit would work. The two 50K potentiometers will be a single stereo potentiometer. Also the PWM's and the LOAD will be powered by different power supply.

View attachment 41258

 

[Hero999]

It looks fine apart from the dual 555 timer part which seems pointless and will probably not work because the two oscillators will not be in phase with one another.

Why not just connect the four MOSFETs in parallel and use one 555 timer?

 

[bryce10110]

I was originally going to go with the single 555 but didn't know if a single 555 could handle the four MOSFETS or more (and I have a lot of parts lying around  I'll go with the single 555. Thanks for the quick reply.

 

[Hero999]

MOSFETs don't require any current to siwtch,.

The only problem is charging/discharging the high gate capacitance but you're only running it at 440Hz so it shouldn't be a huge problem.

 

[bryce10110]

I don't know a whole lot about electronics, still learning. So could you tell me how you determined it will be running at 440Hz.

 

[Hero999]

By using the formula for an astable 555 found on the datasheet besides, I made a mistake it's 283Hz.