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Mein Erster

Beitragvon Jotte92 » 05.12.2008, 21:13

Jotte92
 

Beitragvon finn » 05.12.2008, 21:21

finn
 

Beitragvon Jotte92 » 05.12.2008, 21:24

Jotte92
 

Beitragvon alterhase » 05.12.2008, 22:16

Löten verbindet ...manchmals. :mrgreen:
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alterhase
 
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Beitragvon Jotte92 » 05.12.2008, 22:23

Ok ich veruchs einfach mal mit verschiedenen Werten.
Und wenn ich den besten Wert raus hab ?ndere ich es ab.

Die Schaltung war nicht meine Idee die haben wir mal in Physik durch genommen(ohne Werte nur Funktionsprinzip) ich hab dann die Werte mithilfe von ansagr ausgerechnet und den Schaltplan gemalt.
Jotte92
 

Beitragvon alterhase » 05.12.2008, 22:35

ansgar hat vermutlich 45kV betriebsspannung vorgeschlagen :lol:
Löten verbindet ...manchmals. :mrgreen:
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Beitragvon Jotte92 » 05.12.2008, 22:51

Welchen Basisstrom hat einBC548 Transistor?
Deshalb bin ich warscheinlich auf die 15 mOhm gekommen.
Wenn wir sagen der basisstrom hat 0,5mA mus ich die dann in 0,0005A umrechen oder wie geht das?
Jotte92
 

Beitragvon alterhase » 06.12.2008, 07:26

im prinzip hast du richtig gedacht nur beim rechnen hast du dich um 3 kommastellen vertan. du kannst dir aber ganz einfach merken oder bessernoch auf ein poster schreiben:

R = U / I
volt/ampere ergeben ohm
volt/mA ergeben kohm
volt/?A ergeben Mohm


die erforderliche h?he des basisstroms kannst du erst ausrechnen wenn du den stromverst?rkungsfaktor ? oder H fe des transistors kennst und den erforderlichen collektorstrom kennst.

damit die LED sch?n leuchtet nehmen wir einmal an sind 20mA LEDstrom = kollektorstrom erforderlich. angenommen der stromverst?rkungsfaktor ? ist 100 Ib=Ic/? sind also 0,2 mA basisstrom n?tig. die batterie hat 9V und 0,5V fallen an der basis ab bleiben noch 8,5V die am widerstand verbleiben R=U/I ergibt 8,5/0,2mA = 42,5 kohm. da wir keinen 42,5 kohm widerstand zur hand haben nehmen wir 47k ohm.
das poti ist an derstelle wo du es vorgesehen hast ziemlich unwirksam, das kannst du weglassen. besser w?re es, den 47 kohm widerstand durch einen serienschaltung aus 22kohm + 47kohm poti zu ersetzen.
Löten verbindet ...manchmals. :mrgreen:
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Beitragvon ansgar96 » 06.12.2008, 10:32

ansgar96
 


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