pcb How to use the same switch to control LED and vary resistance


Posted on Feb 7, 2014

I have a 4 position slide switch according to the position of the slide switch, I should turn on different colored LEDs and also vary the output frequency of 555 timer in astable mode and drive a piezo buzzer. Problem : I cant use the same switch to control LEDs and vary the resistor values. How to achieve this that is chang


pcb How to use the same switch to control LED and vary resistance
Click here to download the full size of the above Circuit.

ing the switch position should select different LEDs and also vary the resistance, thus varying the frequency of 555 timer.




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