I
Ian Bell
- Jan 1, 1970
- 0
I have used a 556 dual timer to build a motorbike indicator lights
flasher for a friend. The first timer is arranged as a 30 second one
shot which enables the second timer which is arranged as a 1 sec astable
to flash the indicators. When the first timer is triggered, the second
operates for about 30 secs - the circuit is straight out of the
applications section of the data sheet. I have built two identical
circuits, one for the left and one for the right indicators and operated
by a SPDT momentary switch.
There is one problem though. When it is first powered up, the one shot
timers trigger and both the indicators flash for the 30 second interval.
After that it functions as normal. When first starting up this is a
minor inconvenience but if he stalls the bike and restarts then it
happens again and as he says 'is a bloody pain in the ass'.
So, is there a way to ensure the 30 second one shots do not trigger at
power up?
Cheers
Ian
flasher for a friend. The first timer is arranged as a 30 second one
shot which enables the second timer which is arranged as a 1 sec astable
to flash the indicators. When the first timer is triggered, the second
operates for about 30 secs - the circuit is straight out of the
applications section of the data sheet. I have built two identical
circuits, one for the left and one for the right indicators and operated
by a SPDT momentary switch.
There is one problem though. When it is first powered up, the one shot
timers trigger and both the indicators flash for the 30 second interval.
After that it functions as normal. When first starting up this is a
minor inconvenience but if he stalls the bike and restarts then it
happens again and as he says 'is a bloody pain in the ass'.
So, is there a way to ensure the 30 second one shots do not trigger at
power up?
Cheers
Ian