On 4/2/06, Bob Axtell wrote: > Vasile Surducan wrote: > > >On 3/30/06, Bob Axtell wrote: > > > > > >>I'd do it with a PIC10F20X. It would be 1/10 size, cost 1/5 as much, and > >>would be more reliable than a 555. Take about 5 minutes to write this code. > >> > >> > > > >Bob, > >Anyway or anyhow you're looking , 555 is cheapest than any microcontroller. > >Usually 10x555 = 1cheap microcontroller, as price. > >Output curent capability of a 555 is greatest than any IO. > >Not talking you have to write the code, or if you want ONE monostable > >this is waste of time. > >However there is one problem with 555 monostable: the first false > >trigger at power up. > > > > > > > I don't agree. The 555 itself costs about 0.25 USD, but the capacitors > and resistors > and extra transistor to create a reliable retriggerable circuit easily > pushes it over $1.50 NE555 is here 0.1EUR/1pcs. There is no need for any external transistor and RC components are really free. But I can't kidnap your pleasure of using a PIC in everything (even is worthing or not), so let say you have right. :) Vasile > USD. I can buy the PIC10F200 for $0.50 USD in 100 qty. > > He didn't say he wanted ONE. He said he wanted to correct a problem on a > already-laid-out > production PCB. PLUS, It has no power-up glitches. and will run with an > accuracy of 3% > WORST-CASE, 1% typical. > > The code is about 20 code words. I will write it myself if he wants. > > --Bob > > -- > Note: To protect our network, > attachments must be sent to > attach@engineer.cotse.net . > 1-520-850-1673 USA/Canada > http://beam.to/azengineer > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist