Comments on: ON-OFF Switch circuit using a 555 timer (PCB) https://electronicsarea.com/on-off-switch-circuit-using-555-timer/ Electrical and Electronics Tutorials and Circuits Tue, 16 Jan 2024 14:58:24 +0000 hourly 1 https://wordpress.org/?v=4.9.26 By: Marcel https://electronicsarea.com/on-off-switch-circuit-using-555-timer/#comment-27038 Fri, 05 Oct 2018 20:57:01 +0000 http://electronicsarea.com/?p=1685#comment-27038 Hi Vasudeo V Ajarekar

It seems to me that there is a peak voltage that causes the circuit to activate.

Place a 10 uF electrolytic capacitor between the terminals of the 9 volt source. I hope it works well.

regards.

]]> By: Vasudeo V Ajarekar https://electronicsarea.com/on-off-switch-circuit-using-555-timer/#comment-27031 Fri, 05 Oct 2018 12:01:53 +0000 http://electronicsarea.com/?p=1685#comment-27031 When the circuit is working on 9 vdc (SMPS) adapter, and another mains switches in the same room are operated the circuit automatically became ON ( i. e. without touching any part of the circuit).

What should I do?

]]> By: Marcel https://electronicsarea.com/on-off-switch-circuit-using-555-timer/#comment-2416 Mon, 30 May 2016 19:20:52 +0000 http://electronicsarea.com/?p=1685#comment-2416 Hello Phatty

I do not see a reason, why the resistor has burned. Check the circuit that you put together and try again. The resistor has a value of 3.3M.

regards

]]> By: phatty https://electronicsarea.com/on-off-switch-circuit-using-555-timer/#comment-2163 Thu, 12 May 2016 17:56:39 +0000 http://electronicsarea.com/?p=1685#comment-2163 the resistor of 3.3k ohm burnt I wonder why and I supplied it with a 12v 0.5 amps

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