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Re: bending a 556 to my will.

From: Rob Cruickshank   robcruicinterlog.com
Date: Sat, 2 Nov 2002 08:32:05 -0800

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If I understand corectly, you want the out put of one astable to turn the
other on and off, correct?
All you need to do is connect the two outputs to the inputs of an AND gate,
and the output will look like this:

astable 1, 8 khz:  |||||||||||||||||||||||||||||||||||||||||||||||||||||

astable 2, 10hz     ____------_____-----___

output of  AND gate____||||||||||||_____|||||||||||___

If you want to use CMOS schip, a 4081 is an AND gate, use pins 1, 2 as
inputs, pin 3 as outputs. The positive supply goes to pin 14, pin 7 is
ground, and you must tie the unused inputs, 5,6,8,9,12,13 to ground. Not
that the chip does not have the current drive capacity of the 556- you will
probably need some sort of output driver like a transistor to drive any sort
of load like an LED.





----- Original Message -----
From: jab ber <cr1mp@xxxxxxxxxxx>
To: <arg-list@xxxxxxxxxxxxxxx>
Sent: Sunday, October 27, 2002 5:46 PM
Subject: ARG: bending a 556 to my will.


> A! Sent via the Art & Robotics Group mailing list:
arg-list@xxxxxxxxxxxxxxx
> R! Use your "Reply All" to  reply to the list, "Reply" for private
response
> G!
>
>
> Hello arg-list
>
> Quick question.
>
> I have a 556 ( 2 555's on one chip) setup as two astable multivibrators
>
> I have one side setup as an astable mv generating an
> 8khz signal with a 100 percent duty cycle.
> T1 = 0
> T2 = 0
>
> I have the other side setup as an astable generating an
> .01 khz signal with a 50% duty cycle of
> T1 = 30ms
> T2 = 30ms
>
> my problem:
> What I really want is a combination of the two. In this case an 8khz
signal
> at a 50 percent duty cycle of 30 ms.
>
> Any thinking on how to apply the duty cycle and ms timing of one astable
to
> the frequency of the other?
>
> thank you,
> cr1mp
>
>
>
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