oscillator w adjustable freq and PWM

1287

1d 08:07:21

This square wave oscillator uses a 555 timer for its frequency and an LM358 op amp for pulse width modulation.

Adjust the potentiometers to change frequency and duty cycle accordingly. Change the 20nF cap connected to trig/thr of the 555 to modify the overall offset of the adjustable frequency range.

The range in my example is roughly 35 Hz to 2.3 kHz which should be fine for most musical or noise making applications.

I've designed this circuit based on the NE555 and LM358 data sheets. Feedback on my design would be appreciated.

published 9 years ago

walidgaber

9 years ago

Thank you

lastfuture

9 years ago

Built this circuit on a breadboard and it works out great.

ROCKETBUSTER

9 years ago

nice

andihalim

9 years ago

Thanks

dorurizea

9 years ago

Thank you

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.