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Old 14th March 2009, 06:43 PM   #11
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Yes! You are right! I should have looked at the 555 datasheet - and not tried to do this out of my head!

Your circuit maybe.pdf ought to work.

What I was trying to do was prevent C1 from charging until timer C had timed out, WITHOUT using any more components.
I have fixexed my diagram below to include a transistor.
But if you really want to do it with no extra components, I have another idea, shwn in next post (only one attachment per post it seems)
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Old 14th March 2009, 06:48 PM   #12
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with no extra components....
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Old 14th March 2009, 08:07 PM   #13
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Quote:
Originally posted by Steerpike
Yes! You are right! I should have looked at the 555 datasheet - and not tried to do this out of my head!

Your circuit maybe.pdf ought to work.

What I was trying to do was prevent C1 from charging until timer C had timed out, WITHOUT using any more components.
I have fixexed my diagram below to include a transistor.
But if you really want to do it with no extra components, I have another idea, shwn in next post (only one attachment per post it seems)


oh boy... i got something right good to know that
thanks - your circuit looks nice.
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Old 14th March 2009, 08:09 PM   #14
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Quote:
Originally posted by Steerpike
with no extra components....

Steerpike - it seems to me that this schematic is the same as the one with one transistor... Maybe you did not want to attach this image but some other



i want to thank you for the effort - really - you are the only one that wanted to do some effort to help little old stupid me... thank you again.
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Old 14th March 2009, 09:39 PM   #15
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Dang! I am doing some klutzy things today!
THIS is the picture I meant to upload.
On the first timer R and C change place, so the output on pin 3 starts off low, and after a time goes high.
This lets you use the internal 'discharge' transistor to discharge the timing capacitor of 555-B, instead of an external discharge transistor.

(Because the discharge transistor is conduts then the output is low, you have to swap the R and C.)
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Old 14th March 2009, 09:55 PM   #16
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thanks
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