florinapostol Posted September 17, 2022 Share Posted September 17, 2022 Buna ziua. O dioda Zener 1.5 V / 50-100 mA gasesc la cineva? Contra cost. Multumesc Quote Link to comment Share on other sites More sharing options...
mac01 Posted September 17, 2022 Share Posted September 17, 2022 (edited) Trebuie precizie la zenner? Inseriezi doua diode 1n4001...7 sau BA 157...sau orice dioda care are cadere de tensiune de 0,7V. Obtii in jur de 1,4volti. Edited September 17, 2022 by mac01 Quote Link to comment Share on other sites More sharing options...
validae Posted September 17, 2022 Share Posted September 17, 2022 Chestia cu două diode înseriate funcţionează la un curent mult diferit de al unei diode Zenner dedicate. Şi diodele redresoare au o cădere de tensiune dependentă de temperatură, lucru ce poate fi deranjant uneori. Quote Link to comment Share on other sites More sharing options...
misuraelectronic Posted September 17, 2022 Share Posted September 17, 2022 tot ceea ce este zenner mai mare sau egal cu 2 volti este relativ usor de gasit ... tot ceea ce este sub 2 volti este relativ greu de gasit ... daca iti trebuie precizie mare , atunci e nevoie de o referinta de tensiune ... daca inseriezi 2 diode redresoare banale , polarizate direct , vei obtine 1,2 volti , nu 1,4 volti ...la carte spune extrem de clar ...0,6volti siliciul si 0,2 volti germaniul ... Quote Link to comment Share on other sites More sharing options...
florinapostol Posted September 17, 2022 Author Share Posted September 17, 2022 Acum 30 minute, mac01 a spus: Trebuie precizie la zenner? Inseriezi doua diode 1n4001...7 sau BA 157...sau orice dioda care are cadere de tensiune de 0,7V. Obtii in jur de 1,4volti. Ar trebui sa fie un zener ...... Pentru test o sa pun doua 1n4007 in serie. ar fi bine sa gasesc un zenner. La magazinele de specialitate sint doar de 1.8 V Quote Link to comment Share on other sites More sharing options...
mac01 Posted September 17, 2022 Share Posted September 17, 2022 (edited) @misuraelectronic Mai pune una rapida care are 0,3V....tot ca la carte. Cand nu ai si daca montajul este fara pretentii...atunci improvizezi. Edited September 17, 2022 by mac01 Quote Link to comment Share on other sites More sharing options...
misuraelectronic Posted September 17, 2022 Share Posted September 17, 2022 nu este corect ...regimul de stabilizare este intotdeauna in conductie inversa si are alte proprietati decit regimul de conductie directa a unor diode redresoare banale ... daca vrei sa faci teste ...ia si agatza acolo o baterie R3 nou-noutza si faci cite teste vrei ... Quote Link to comment Share on other sites More sharing options...
florinapostol Posted September 17, 2022 Author Share Posted September 17, 2022 Quote Link to comment Share on other sites More sharing options...
maresaldeflota Posted September 17, 2022 Share Posted September 17, 2022 https://ro.farnell.com/solid-state/1n5302/silicon-current-limiting-diode/dp/2888709 Quote Link to comment Share on other sites More sharing options...
misuraelectronic Posted September 17, 2022 Share Posted September 17, 2022 daaaa....l-ai ajutat de l-ai rupt in doua ! trebuie sa cumpere minim 25 de bucati ... Quote Link to comment Share on other sites More sharing options...
mac01 Posted September 17, 2022 Share Posted September 17, 2022 (edited) Plus ca diodele sunt in America, taxa de transport 110 lei si ei n-au pe stoc decat 6 bucati. Initiator...pune doua diode inseriate cum ti-am spus.....montajul arata destul clar si este fara pretentii. Edited September 17, 2022 by mac01 Quote Link to comment Share on other sites More sharing options...
florinapostol Posted September 17, 2022 Author Share Posted September 17, 2022 Acum 6 minute, maresaldeflota a spus: https://ro.farnell.com/solid-state/1n5302/silicon-current-limiting-diode/dp/2888709 multumesc , devine mult prea scump. ma gindeam ca poate are cineva vreuna din recuperari... macar asa sa fac niste teste Acum 1 minut, mac01 a spus: Plus ca diodele sunt in America, taxa de transport 110 lei si ei n-au pe stoc decat 6 bucati. Initiator...pune doua diode inseriate cum ti-am spus.....montajul arata destul clar si este fara pretentii. Asta o sa fie primul pas. Multumesc! Quote Link to comment Share on other sites More sharing options...
maresaldeflota Posted September 17, 2022 Share Posted September 17, 2022 (edited) Nu știu ce condiții au ăștia https://allegro.pl/oferta/40szt-1n5302-diode-1-5v-0-6w-zener-axial-11375641164 Ceva mai din eu. https://shop.tvsat.com.pl/pl/p/40szt-1N5302-Diode-1.5V-0.6W-Zener-Axial-DO204AA-COMPDEV/7199 Edited September 17, 2022 by maresaldeflota Quote Link to comment Share on other sites More sharing options...
misuraelectronic Posted September 17, 2022 Share Posted September 17, 2022 (edited) repet ...daca vrei sa faci doar teste ...ia o baterie R3 sau R6 --- exceptie marca DURACELL ,ca astia le fac de noi cu 1,68 volti --- si o bagi intr-un soclu de baterie cu fire incluse ...se gasesc ambele tipuri de socluri , nu ridica probleme si poti face cite probe vrei ... dupa aceea , la urma , daca nu gasesti si nu gasesti zenner de 1,5 volti , te apuci si faci un mic montajel cu un lm317 ...il reglezi frumos ca sa ai pe iesire fix 1,5 volti ...scoti semireglabilul ...pui valoare fixa de R in loc de semireglabil ...lipesti R ...si gata ! asa moare ... Edited September 17, 2022 by misuraelectronic Quote Link to comment Share on other sites More sharing options...
validae Posted September 17, 2022 Share Posted September 17, 2022 Caută diode româneşti de referinţă în direct, respectiv DRD2 ...mai jos un topic despre acest tip: Quote Link to comment Share on other sites More sharing options...
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