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How to wire a 555 chip - variable square wave generator

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Published Feb 7, 2017

NOTE: This is NOT truw pwm. This is a circuit for manual frequency control. To have pwm that is controlled by a 555 chip, there is a circuit diagram at this site: falstad dot com slash circuit, when the applet loads go to Circuits menu, choose 555 Timer Chip, then choose Pulse Width Modulator.

Items used: solderless breadboard, 555 chip, 510 ohm resistor, 100k ohm variable resistor, 1 RGB LED at 20-25ma, wires, 9v battery. And those vertical lines are what i mean in terms of what you can see only on the camera. You can see the led light of course without the camera.

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