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Das Elektroniker-Forum • Thema anzeigen - Die Kondensatoren am LM78xx

Die Kondensatoren am LM78xx

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Moderator: Tim Sasdrich

Die Kondensatoren am LM78xx

Beitragvon Hobbybastel » 10.12.2009, 22:32

Hallo,

seit fast zwei Monaten kann ich mich, der Dunkelheit sei Dank, fast jeden Abend wieder am Basteltisch niederlassen. Jetzt habe ich eine kleine Gegentaktstufe aufgebaut, die in ein kleines Gehäuse soll. Zum kurzen Hörbarmachen von NF-Signalen ohne hinten am richtigen Verstärker herumfummeln zu müssen ist die sicherlich sehr gut.

Ideal sind dafür 6 V. Also hab ich einen LM 7806 eingebaut, so das man eine jegliche Gleichspannungsquelle mit 8 bis 30 Volt anschließen kann. Der LM 7806 benötigt die zwei im Datenblatt angegebenen Kondensatoren mit 0,1 und 0,33 µF. Letzteren bekomme ich hier aber nicht. E-Schmidt hat den nicht und auch Conrad hat viele 33er Werte nicht mehr, wie so vieles andere. Dadurch wird es klassischen Hobbyelektronikern immer schwerer gemacht.

Daher die Frage, ob ich statt der 0,33 µF nicht einen anderen Wert nehmen kann, z. B. 0,47 oder 1 µF? Irgendwie müssen sich die 0,33 µF ja auch ergeben, die der Hersteller angibt.
Hobbybastel
 

Re: Die Kondensatoren am LM78xx

Beitragvon dussel07 » 10.12.2009, 23:11


Die Spannungsregler sind eigentlich recht unkritisch -
Man sollte allerdings bedenken:
Je höher die Spannungsdifferenz Eingangsspannung -> Ausgangsspannung desto größer die Verlustleistung und kleiner die nutzbare Leistung.
Beispiel:
Eingangsspannung 9V Wechselstrom
Ausgangsspannung 5V
Möglicher Strom zB 1,5A

gleicher Spannungsregler

Eingangsspannung 30V Wechselstrom
Ausgangsspannung 5V
Möglicher Strom 0,3A

Ist nur ein Beispiel, muß sich also nicht genauso verhalten aber die grobe Richtung stimmt.
Ja, - ich bin Zwilling
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dussel07
 
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