Bonjour,

Pouvez vous me dire si le circuit est bon sur LT Spice ?

?

?

Merci par avance

开云体育

Il faut télécharger le fichier .asc sur le site dans l'emplacement Files -> Temp.
Je ne comprends pas ce schema.
La tension sur l'entrée non inverseuse de U2 est toujours positive, donc la sortie restera toujours positive aussi.

开云体育

The negative input of U2 should be biased positive if you want to give it a chance to trigger.
You may have a problem with the direct connection of CV to Gnd. It may work in practice but does not simulate well. I think it's a known problem with the 555 model(s).

Bonjour

Another approach could be to use an un burnt gas detector SnO2. Smoke being by definition un burnt gases CO SOX and NOX. It would have the added advantage of detecting gas leaks, and liquid fuel spills before they get ignited. The circuit is simpler as well.

Suusi M-B


From: LTspice@... [mailto:LTspice@...] On Behalf Of tranvouez.olivier@...
Sent: 05 January 2014 12:05
To: LTspice@...
Subject: [LTspice] Smoke Detector




Bonjour,
Pouvez vous me dire si le circuit est bon sur LT Spice ?



Merci par avance