555 Timer broken?

I built a PWM controller based on a circuit supplied by Sgt. Wookie (see attatched)

I've finally gotten round to putting it all together and had it running briefly, i then added in a fuse and a couple of LED's and now its stopped working!?

all the components seem to check out ok, i put a 12V source directly to the gate on the IRFZ46N and i get a 12V output so i assume the 555 has had it

i put a multimeter across pin 3 and ground and there was nothing, i also tried to read the frequency but it read 0

Any suggestions as to what i can try and to why it failed?

Thanks

 

Is the fuse ok?

Where you get the 12V from?

 

fuse is fine, i even tried bypassing it altogether and the chip is definitely getting 12V in

power is from a DC adapter that you plug into the wall and before anyone asks, i have tested it and it works fine

 

Do you measure 12V across the adapter or more?
In other words, is it regulated or not?

 

i have all of the components on a stripboard and wire instead of using the traces as its supposed to be carrying 11A

I think i may have found a problem with a short between pins 5 and 6, would that kill it?

original thread is located here

Edit: its ~12.5V out of the adapter, no idea if its regulated or not, its for a rechargeable AA battery charger i have

 

2 seconds with the old dremel and its now working again

apologies for wasting your time fella's

thanks for your help, much appreciated

 

I see you have added some LED's to the original ckt. R6 is too low of a value. I calculate about 45MA to the LED. I would go with at least a 680Ω, for it. I would do likewise for R5. Even thou LED's have a maximum current I find them to be very visible at 1/2 of their maximum current.

 

both of the LED's are super bright, and if i'm honest a bit too bright lol

the Red has a max voltage of 2.6V and a max current of 50mA,

as for the green the max V of 3.8V and max current of 30mA

 

Sorry for my error, you have it under control.