Hi All,
I've done a search and can't see a specific answer to my query so here goes...
I'm newish to electronics and am experimenting with a 555 timer IC in astable mode and powered by a 9v battery. I'm trying to calculate the ratings of the resistors needed for the LEDs it will be flashing but the output voltage at pin 3 seems wrong. I'm given to believe the voltage drop should be around 1.7v but when I took a reading with my multimeter while it was high, it was showing 8.6v. I then changed out the IC for another and that was showing 8.7v.
That's not right, is it? Any advice please?
Thanks, Tony
I've done a search and can't see a specific answer to my query so here goes...
I'm newish to electronics and am experimenting with a 555 timer IC in astable mode and powered by a 9v battery. I'm trying to calculate the ratings of the resistors needed for the LEDs it will be flashing but the output voltage at pin 3 seems wrong. I'm given to believe the voltage drop should be around 1.7v but when I took a reading with my multimeter while it was high, it was showing 8.6v. I then changed out the IC for another and that was showing 8.7v.
That's not right, is it? Any advice please?
Thanks, Tony
Last edited: