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Old 9th January 2009, 07:46 PM   #16
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Originally Posted by mike2545 View Post
I agree that the capacitors are too small but I would go with a 250 uf on the input of the reg and a 1000 uf on the output. That should smooth things out
1000µF won't make much difference.

Anything over 100µF on the output and 1µF on the input is excessive.

I echo some of the comments above:

Increase the values of R by a factor of 10 and reduce C by a factor of 10 and the current consumption will be reduced.

What sort of regulator are you using?

You didn't say what the part number is?

Make sure the input is high enough so it isn't dropping out.
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Last edited by Hero999; 9th January 2009 at 07:46 PM.
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Old 9th January 2009, 08:41 PM   #17
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Originally Posted by Hero999 View Post
What sort of regulator are you using? You didn't say what the part number is? Make sure the input is high enough so it isn't dropping out.
He did say: LM340T5. Which is why I was able to quote Vinmin from the datasheet in a previous post, and why I suggested his 6.8V input may not be enough to allow his part to regulate.

(You must have missed that part of the discussion )
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drops, frequency, lm555, output, regulator, supply, voltage

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