is the output of a 555 high when the condenser is discharged ?
Well, i suppose you want to make a PWM. Considering of the diodes. it seems you have some wrong wiring. At first, you get output from 3, where you should from 7. Anyway. Check this 555 PWM circuit that is tested and it works.well I can't understand why the atached circuit will not work....
You get enough power.well pin 7 is discharge, you wont get any power from it. if your comtrolling a mosfet its quite ok to use pin 3 as output
Take a closer look. I power the mosfet from the pin 7. It works perfect. Copy and test it.my circuit is the same as the one your showing me.....
hi,I've done it in real life si I be damned if I know why it won'y work, its the same as the above linked circuit too, I think I may try and make it in real life later
hi,pcbheaven: your using a pullup resistor on pin 7 to create the output signal to drive the mosfet, this is a good way of doing it however it has nothing to do with the actual operation of the circuit, the actual circuit drive is the same as what i have you are using pin 7 coupled with a resistor to drive the mosfet I am not driving anything at all just sampling pin 3 with a scope, if I were to drive a mosfet weather or not I use pin 3 or 7 (with the extra resister) it would make no difference to the circuit actually working.
Eric: yes its a dual channel scope, I think my simulator is playing me up