Transistor utilisé base en l'air

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Bonjour,









J'ai beau faire une recherche sur le net avec par exemple en anglais:
bjt transistor, base left floating, base unconnected, etc sans trouver  




Re: Transistor utilisé base en l'air
Le Sun, 21 Jan 2018 10:06:05 +0100,

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    Bonjour,










    ou un miroir.


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    JKB

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=> http://grincheux.de-charybde-en-scylla.fr
=> http://loubardes.de-charybde-en-scylla.fr

Re: Transistor utilisé base en l'air

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tard avec.

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normalement secondaire dans leur utilisation habituelle, tension
d'avalanche etc.



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rie par

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ction

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ue
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r  
en inverse pour produire une tension stable aux environs de 5 volts (en  
pseudo Zener, donc).
De plus, quand j'utilise ce type de montage, je connecte le transistor  



tteur.



 la  



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https://www.cjoint.com/doc/18_01/HAvnfnpvaOh_0.gif



  


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polarisation.

le cas du 2N2222, ex :
http://anuradhai4.blogspot.fr/2017/10/simple-led-flasher-with-2n2222.html

Re: Transistor utilisé base en l'air
Le Sun, 21 Jan 2018 16:36:54 +0100,


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    JKB


--  


=> http://grincheux.de-charybde-en-scylla.fr
=> http://loubardes.de-charybde-en-scylla.fr

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On peut ! :-)


facilement les 100 MHz dans un oscillateur classique.

Re: Transistor utilisé base en l'air

taient  
base en "l'air" quand la CEM n'avait pas encore tout envahi.
On devait y poser un condensateur sur la base pour limiter les "parasites
".


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 l'air.
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Pour plus de details

http://www.nutsvolts.com/magazine/article/light-sensitive-circuits

Je me souviens qu'a l'epoque j'enlevais la peinture sur des "OA70" pour  
en faire des "phototransistor"


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Hi ! Moi aussi !

suceptible de permettre l'automatisation totale de l'exposition d'un  
agrandisseur photographique.








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Re: Transistor utilisé base en l'air





Une belle ronflette de 100 Hz avec une alim super plate !!


, je lisais 20K !)



phototransistor.

h22=Ic/Vce ou Z22=Vce/Ic=Vce/beta*Ib







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...


moog http://www.till.com/arptech/pdf/p3475623.pdf
http://www.matrixsynth.com/2008/02/transistor-ladder-filter-tattoo.html







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