flashing led's

Please help!

I am using a reed switch to generate a pulse from a rotating disc. I want high power led's to flash in time with the rotating disc to freeze the motion.

At the moment the pulse is too long and I would like to shorten it. I thought I could use a monostable 555 timer to do this.

Does anybody have a schematic I could look at?

The pulse is a 5Vdc signal which needs to switch a mosfet

I am stuck!

Yes, use the monostable 555 timer circuit, it'll need to be AC coupled as the pulses last longer than the delay but that's as simple as adding a couple of resistors and a capacitor, see the 555 datasheet for more information.

Hero999 said:

Yes, use the monostable 555 timer circuit, it'll need to be AC coupled as the pulses last longer than the delay but that's as simple as adding a couple of resistors and a capacitor, see the 555 datasheet for more information.

Click to expand...

hi. thanks. where can i find the 555 data sheet? i've been using one from the doctronics web page and I keep melting my reed switches!

i must be doing something silly

1) You need to learn how to use Google.

2) The read switch only needs to trigger the 555 timer which shouldn't use much current.

Hero999 said:

1) You need to learn how to use Google.

2) The read switch only needs to trigger the 555 timer which shouldn't use much current.

Click to expand...

ok. thanks very much