Le circuit utilise un comparateur de tension et une horloge monostable pour donner la garde attention à distinguer une personne en mouvement. IC ua741 (Ic1) est utilisé comme un comparateur de tension avec deux diviseurs potentiels dans ses entrées bouleversantes et noninverting. Résistances R1 et R2 donnent moitié-tension de 4,5 volts à sa transformation, dont (axe 2). Ldr1 et préréglé Vr1 structure un diviseur de potentiel remplaçant de fournir une tension variable comprennent à l'entrée non-bouleversant (manche 3).
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