Dual NE555 sequential timer
Dual NE555 sequential timer
(OP)
javascript:openreq('http://w ww.ortodox ism.ro/dat asheets/ph ilips/NE_S A556_2.pdf')
Hi all,
I built the sequential timer circuit on page 5 of the PDF link above. It is almost what I need but not quite. The 2 pulses are too close together. I need a two 0.5 second long positive going pulses separated by 0.5 sec off. The pulses in the circuit as shown are one after the other and too close together. Can anyone suggest how I might modify the circuit to add a 0.5 second delay between the 2 pulses? I am using 1 meg ohm and 1 uf for R and C.
Thanks,
Jan
Hi all,
I built the sequential timer circuit on page 5 of the PDF link above. It is almost what I need but not quite. The 2 pulses are too close together. I need a two 0.5 second long positive going pulses separated by 0.5 sec off. The pulses in the circuit as shown are one after the other and too close together. Can anyone suggest how I might modify the circuit to add a 0.5 second delay between the 2 pulses? I am using 1 meg ohm and 1 uf for R and C.
Thanks,
Jan





RE: Dual NE555 sequential timer
Throw out the 555, and use a low end PIC. It's cheaper, needs fewer external parts, is capable of much more complex behaviors, and is much, much easier to program.
If programming in assembly intimidates you, use a Basic Stamp instead. The cheapest version will do just fine.
Mike Halloran
Pembroke Pines, FL, USA
RE: Dual NE555 sequential timer
RE: Dual NE555 sequential timer
circuits, and timing calculations here:
http://