simple 555 timer circuit, driving me mad

Winston Smythe's picture

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Joined: Mar 06, 2021

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simple 555 timer circuit, driving me mad
March 6, 2021 - 5:50am

I'm not a newcomer to electronics but I'm a newcomer to ICs and thought I'd try a 555 timer to flash a LED.

I've tried this over and over again - the LED just comes on and stays on.

I've recently recreated the circuit in a simulation program and the same happens.

Please- what stupid thing am I doing wrong?

Link to image is here    https://ibb.co/ZBNC4D4

Thank you.

Sourav Gupta's picture

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Joined: Feb 12, 2018

Replies: 628

Try to lower the 470k resistor. It is a very high value for that 1uF capacitor. Try using something like 10-100k and try again.