<div><div><a href="http://www.talkingelectronics.com/EM/Projects/555in_pdf_frame/50-555Circuits.pdf">http://www.talkingelectronics.com/EM/Projects/555in_pdf_frame/50-555Circuits.pdf</a></div><br></div><div dir="auto">Regards,</div><div dir="auto">JPS</div><div dir="auto"><br></div><div dir="auto">(Colin Mitchell is one of my pre-teen heroes!)</div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, 19 Jan 2020 at 7:46 am, Jean-Pierre Desrochers <<a href="mailto:jpdesroc@oricom.ca">jpdesroc@oricom.ca</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">This circuit (D1 add on) is exactly what I was looking for..<br>
A retriggerable monostable... YES !<br>
<br>
Thanks Peter !<br>
JP<br>
-----Message d'origine-----<br>
De : Ullrich Peter [mailto:<a href="mailto:Peter.Ullrich@kapsch.net" target="_blank">Peter.Ullrich@kapsch.net</a>] <br>
Envoyé : 18 janvier 2020 16:15<br>
À : Jean-Pierre Desrochers; <a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a><br>
Objet : Re: [sdiy] LM555 mono stable question<br>
<br>
A retriggerable 555 circuit could help here:<br>
<br>
<a href="http://de.f-alpha.net/elektronik/integrierte-schaltungen/timer-555/weiter-gehts/experiment-13-retriggerable-monoflop/" rel="noreferrer" target="_blank">http://de.f-alpha.net/elektronik/integrierte-schaltungen/timer-555/weiter-ge<br>
hts/experiment-13-retriggerable-monoflop/</a><br>
<br>
Ciao<br>
Peter<br>
<br>
<a href="http://www.ullrich.at.tt" rel="noreferrer" target="_blank">http://www.ullrich.at.tt</a><br>
<br>
________________________________________<br>
Von: Synth-diy <<a href="mailto:synth-diy-bounces@synth-diy.org" target="_blank">synth-diy-bounces@synth-diy.org</a>> im Auftrag von Jean-Pierre<br>
Desrochers <<a href="mailto:jpdesroc@oricom.ca" target="_blank">jpdesroc@oricom.ca</a>><br>
Gesendet: Samstag, 18. Jänner 2020 21:57<br>
An: <a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a><br>
Betreff: [sdiy] LM555 mono stable question<br>
<br>
That should be an easy one for you guys...<br>
<br>
I'm working on a mono stable circuit using a 555.<br>
Input: small low going pulse (5v to 0, 5usec) on pin 2.<br>
Output pulse: allways .050sec high going pulse (0 to 5v) on pin 3<br>
This is this circuit:<br>
<a href="https://alxslvrmn.weebly.com/555-monostable-diagrams.html" rel="noreferrer" target="_blank">https://alxslvrmn.weebly.com/555-monostable-diagrams.html</a><br>
<br>
I tweaked R1 & C1 to get this 0.050sec output pulses..<br>
This circuit works pretty well if I keep the incoming pulses<br>
periods higher than .050sec in this case..<br>
If I go lower than .050sec between each input pulses it's understandable<br>
The 555 pin 3 output does not stay high because of the 555 nature..<br>
But is there a way to overcome this situation ?<br>
Should I use another approach ? Using another IC than the 555 ?<br>
In fact what I need is a pulsating.050sec output that will stay high<br>
If I exceed the .050sec input limitation here (lower input pulses period<br>
than .050sec).<br>
JP<br>
<br>
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</blockquote></div></div>