nigelb
Newbie level 3
555 timer monostable circuit
Hi
I need a small gadget for the car, where each time its powered on it lights a light for about 5 secs, then turns it off.
I've robbed a Maplin circuit, and moved the 10 nF cap from pin 5 to ground, to pin 2 to ground, and now the circuit sometimes triggers on power up but not always.
I'm wondering if the cap is maybe staying charged, and putting something like a 1M resistor across it would do the trick?
Sounds like a horrible bodge, I'm open to suggestions on how to do this properly.
Many thanks
nige
Hi
I need a small gadget for the car, where each time its powered on it lights a light for about 5 secs, then turns it off.
I've robbed a Maplin circuit, and moved the 10 nF cap from pin 5 to ground, to pin 2 to ground, and now the circuit sometimes triggers on power up but not always.
I'm wondering if the cap is maybe staying charged, and putting something like a 1M resistor across it would do the trick?
Sounds like a horrible bodge, I'm open to suggestions on how to do this properly.
Many thanks
nige