[sdiy] LM555 mono stable question

[John P Shea]

http://www.talkingelectronics.com/EM/Projects/555in_pdf_frame/50-555Circuits.pdf

Regards,
JPS

(Colin Mitchell is one of my pre-teen heroes!)

On Sun, 19 Jan 2020 at 7:46 am, Jean-Pierre Desrochers <jpdesroc at oricom.ca>
wrote:

> 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/
> <http://de.f-alpha.net/elektronik/integrierte-schaltungen/timer-555/weiter-gehts/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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