MOTM

At 5:47 PM +0100 4/24/03, Tony Allgood wrote:
>  > The other option would be to replace the TLC555 with a regular 555
>that can flash lights and ignite blasting caps...
>
>... and probably put noise on the power supply. The 555 seriously
>crowbars its supply when ti goes over.

Absolutely.  There is no reason to use a regular 555 unless you need
the extra current, or that's what you have on hand :)  So I assembled the
module with a socket.  I figure if the TLC555 doesn't work, I could
easily toss in a 555 that can power solenoids and small motors.

>  > and increase the size of its bypass cap.
>
>It'll probably help, but it won't completely keep the crap out of the
>supplies. Maybe use a little series resistance in the power line too??

I didn't want to hack the PCB, which is why I decided not to use a
spare half of TL072 as a buffer.  As it turns out the TLC555 works
fine....