Hello.
I want to invert a delayed 555 output pulse.
I'm triggering the 555 some 3 seconds after circuit power-on. Then I feed the signal to a NPN transistor (2N2222) to invert it. I need to have a ground pulse generated 3 seconds after circuit power-on.
However, with the following circuit (image attached) I'm getting a ground pulse from the transistor on circuit power-on, and then again after the 555 triggers 3 seconds later. So my load is triggered not from the delayed 555 but from the power-on ground pulse.
How do I prevent my transistor to send a ground pulse on power-on?
thanks.
I want to invert a delayed 555 output pulse.
I'm triggering the 555 some 3 seconds after circuit power-on. Then I feed the signal to a NPN transistor (2N2222) to invert it. I need to have a ground pulse generated 3 seconds after circuit power-on.
However, with the following circuit (image attached) I'm getting a ground pulse from the transistor on circuit power-on, and then again after the 555 triggers 3 seconds later. So my load is triggered not from the delayed 555 but from the power-on ground pulse.
How do I prevent my transistor to send a ground pulse on power-on?
thanks.