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 Post subject: Variable scan-speed
PostPosted: 13.01.2004 23:36 
Hi!

I really like this site and I'll now try this schematic.

I have one question, how will I do to make the scan-speed variable? With some pot?

//Andreas


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PostPosted: 13.01.2004 23:47 
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Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
I'm not sure how directly this formula from the beginning of the page will work with my circuit because I don't have that second resistor but here is the calculator for it:
http://ourworld.compuserve.com/homepage ... en/555.htm

Basically you need a pot. Best way is to use 10Kohm resistor and for example 47Kohm pot so that the range will be 10Kohm-57Kohms etc. You can chance the cap too to change the timebase. Too radical values will not work though.

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