[sdiy] LM555 mono stable question

[Jean-Pierre Desrochers]

This circuit (D1 add on) is exactly what  I was looking for..
A retriggerable monostable... YES !

Thanks Peter !
JP
-----Message d'origine-----
De : Ullrich Peter [mailto:Peter.Ullrich at kapsch.net] 
Envoyé : 18 janvier 2020 16:15
À : Jean-Pierre Desrochers; synth-diy at synth-diy.org
Objet : Re: [sdiy] LM555 mono stable question

A retriggerable 555 circuit could help here:

http://de.f-alpha.net/elektronik/integrierte-schaltungen/timer-555/weiter-ge
hts/experiment-13-retriggerable-monoflop/

Ciao
Peter

http://www.ullrich.at.tt

________________________________________
Von: Synth-diy <synth-diy-bounces at synth-diy.org> im Auftrag von Jean-Pierre
Desrochers <jpdesroc at oricom.ca>
Gesendet: Samstag, 18. Jänner 2020 21:57
An: synth-diy at synth-diy.org
Betreff: [sdiy] LM555 mono stable question

That should be an easy one for you guys...

I'm working on a mono stable circuit using a 555.
Input: small low going  pulse (5v to 0,  5usec) on pin 2.
Output pulse: allways  .050sec  high going pulse (0 to 5v)  on pin 3
This is this circuit:
https://alxslvrmn.weebly.com/555-monostable-diagrams.html

I tweaked R1 & C1 to get this 0.050sec output pulses..
This circuit works pretty well if I keep the incoming pulses
periods higher than .050sec in this case..
If I go lower than .050sec between each input pulses it's understandable
The 555 pin 3 output does not stay high because of the 555 nature..
But is there a way to overcome this situation ?
Should I use another approach ? Using another IC than the 555 ?
In fact what I need is a pulsating.050sec  output that will stay high
If I exceed the .050sec input limitation here (lower input pulses period
than .050sec).
JP

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