[sdiy] 555 (was: Chaotic windows and analogue windchimes.)

[Scott Gravenhorst]

http://www3.ncsu.edu/ECE480/480_555.htm is a good thing to
read.  There is a tutorial there and there are links to
application notes for further understanding.

Also, there is a CMOS version (ICM7555 is one number) that
is functionally the same and pin for pin compatible, but
it does not glitch the power supply when pin 3 changes
states as the bipolar unit does.

Toby Paddock <tpaddock at seanet.com> wrote:
>The simplest osc circuit I can think of for a 
>555 just to get something out of it is:
>
>+power to pins 4 and 8.
>ground pin 1.
>pin 7 no connection.
>optional 0.01uF from pin 5 to ground.
>
>tie pins 2 and 6 together.
>10k from pin 3 to 2&6.
>0.1uF from ground to 2&6.
>
>Output pin 3 should have about a 1kHz square wave.
>Values not critical, especially the pin 5 cap.
>This is from memory. Someone correct me if I'm wrong.
>
> - -- -  Toby Paddock
>
>Arun Bohm wrote:
>
>I am having trouble with getting a pulse signal from these 555 timer chips from
>radio shack. I am not to sure about component handling but I was always under the
>impression that they are pretty sturdy however I haven't been able to get any to
>work in my projects. I am following all schematic outlines and procedures it seems
>but still can't get any signal. What could I possibly be doing wrong. I f anyone
>has any good schematics for Audio oscillators that are cheap and easy please let
>me know.
>thanks,
>Joey.
>
>
>
>

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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