Re: square waveform (555)

Ken O wrote:
<stratus46@xxxxxxxxx> wrote in message news:1153069153.154857.10490@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Ken O wrote:

"Tim Williams" <tmoranwms@xxxxxxxxxxx> wrote in message
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"Ken O" <lera@xxxxxxxxx> wrote in message
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So usinf a 6v supply, instead of getting 6v high 0v low. I get 6v high,
5.99v, 5.98 ... 5.89, (there is a small slope at the high)

5.89V counts as damned close to 6V if you ask me. You're lucky to get
that much with silicon, a 0.6V drop is more typical (and you'll find it
under a stiffer load).

I don't know why it would drop. It could be real, some effect internal to
the 555, a power supply issue (is +V varying by 0.1V as well?), or
something with your meter, or how you're measuring it.


Ok I put up a web page to show what I get on the scope:
http://www3.sympatico.ca/lerameur/

Everything is supplied by a 12v battery

I am using this cicuit: http://www.kettering.edu/~bguru/EE323/EE323-05.pdf
except for the resisitor to change the frequency.

Ken

Its staring you in the face right in the photo. Put the scope into DC
coupling and check back.


oook , thank you
I feel dumb enough now

K



Sometimes the hardest things to spot are the most obvious ones.
.

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