[sdiy] God! Do I need a simple latch switch!

[Scott Gravenhorst]

ICM7555 CMOS does not crowbar and is otherwise a drop in,
(check supply ratings...)

Scott Bernardi <sbernardi at home.net> wrote:
>Does the CMOS 555 have the same problem?
>
>Paul Maddox wrote:
>> 
>> Ken,
>> 
>> > I had actually started to think about manually
>> > clocking (switching) a 555 to generate logic 1 and
>> > logic 0, for each 'push', you get a peak and a trough
>> > from a square output, in fact I'd use anything that
>> > will give that output to drive the'switching in the
>> > 4066/16...thats how I think!!!
>> 
>> NOOOOOOOOOOOOOOOOO!!!!!!!!
>> 
>> Not a 555, BAD, very BAD, very very BAD!!!
>> 
>> each time you trigger the 55 iut crowbars and pulls the 5v down to 0v for a
>> moment..
>> Noisey noisey 5v line....
>> 
>> If you REALLY want to use discrete, why not use a bistable made from a pair
>> of NPN transistors?
>> 
>> These could drive any number of FETs (in both inverse and normal)...
>> 
>> Paul Maddox
>> _______________________________________
>> Wavesynth home page;-
>>     Http://www.wavesynth.com
>> Modulus synthesizers home page;-
>>     Http://www.wavesynth.com/modulus
>
>-- 
>Scott Bernardi
>sbernardi at home.net

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