false signals triggering 555 timer

[aha]

anybody knows something about this?
i got a good 7812 power supply with big capacitors and some small mkm ,
and pin 2 connected to + with a 10k resistor wich improved a lot,but not all
of the error triggers.

thanks.abe


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[Robert C Monsen]

anybody knows something about this?
i got a good 7812 power supply with big capacitors and some small mkm ,
and pin 2 connected to + with a 10k resistor wich improved a lot,but not all
of the error triggers.

thanks.abe

I would suggest bypass caps from the Vcc pin to ground; 0.1uF ceramic, and
10uF tantalum should help.

Also, make sure the control input is bypassed to ground using a 0.1uF cap.

Regards,
Bob Monsen