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Elektroniikkafoorumi • katso viestiketjua - LED, on- auto off. Piiriin apuja
Sivu 1/1

LED, on- auto off. Piiriin apuja

ViestiLähetetty: Pe Tammi 05, 2018 10:47
Kirjoittaja The Eye
Moro

Apuja kaivattaisiin
Joskus nuorena tuli vähän pelattua näiden kanssa, mutta nyt ei aivotoimita riitä edes tälläisen piirin rakentamiseen.

Yksinkertaisesti: Ledi päälle painonapista, ledi sammuu itsestään x min kuluttua.

Ehtoja:
Led Sinisen sävyinen.
virtalähde: Pieni nappiparisto (lr41/CR2032 etc)
Ledin tulisi palaa 1-2h
Ledin tulisi palaa yhtä kirkkaana kokoajan.
Optiona, sammutusajan säätö

tässä vaiheessa komponenttien koolla ei ole väliä, mutta jatkokehittelyyn tarvitaan viritelmästä mahdollisimman pieni.

Re: LED, on- auto off. Piiriin apuja

ViestiLähetetty: Pe Tammi 05, 2018 17:57
Kirjoittaja peran
Ongelmanratkaisua vaikeuttaneen, ettei 3 V ole välttämättä riittävä sinisen ledin kynnysjännitteeksi.

Re: LED, on- auto off. Piiriin apuja

ViestiLähetetty: Pe Tammi 05, 2018 18:17
Kirjoittaja The Eye
Totta, Siksi cr2032 ei olekaan ehkä parasratkaisu. Koska koko kasvaa suotta.
Joten jokin 1,5vx3 voisi olla fiksuin ratkaisu.

Mutta eipäs tehdä jännitelähteestä ongelmaa tässä vaiheessa, olkoon se riittävä

Re: LED, on- auto off. Piiriin apuja

ViestiLähetetty: Su Tammi 07, 2018 10:18
Kirjoittaja GaryP
Vilkaisepas tuota ja sovella sopivasti.
http://www.instructables.com/id/DIY-Tin ... t-Crystal/

Kari