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Das Elektroniker-Forum • Thema anzeigen - Klingelgenerator 60V/25Hz für altes Telefon

Klingelgenerator 60V/25Hz für altes Telefon

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Moderator: Sebi

Re: Klingelgenerator 60V/25Hz für altes Telefon

Beitragvon Heinz.V. » 24.01.2012, 09:05

Hallo !

Die letzte gezeigte Schaltung habe ich fast in sehr ähnlicher Form übernommen. Nur das die Größe des Trafos und der Transistoren paar Nummern kleiner ausfallen. Der Spannungsregler 7812 konnte bei 6V entfallen (ob der hier bei 12V noch was zu Regeln hat?). Da wäre ein 7808 bestimmt besser geeignet. Das Trimmpoti 47K reicht gerade für 50 Hz. Eine Reihenschaltung 47K Poti mit 10K Festwiderstand wäre besser auch wegen Verbindung Pin2 zu Pin3. Für 60 Hz (USA / Japan) reichen 39K. Bei 25 Hz wird ein Widerstand von ca. 88K benötigt.
Heinz.V.
 

Re: Klingelgenerator 60V/25Hz für altes Telefon

Beitragvon alterhase » 24.01.2012, 11:52

Ja! Du hast recht mit dem Stabi.

Die meisten Schaltpläne unterscheiden sich nur durch die Fehler die beim Abzeichnen gemacht wurden :mrgreen:
Löten verbindet ...manchmals. :mrgreen:
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alterhase
 
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Re: Klingelgenerator 60V/25Hz für altes Telefon

Beitragvon AlterMann » 24.01.2012, 14:17

AlterMann
 

Re: Klingelgenerator 60V/25Hz für altes Telefon

Beitragvon alterhase » 24.01.2012, 14:28

Löten verbindet ...manchmals. :mrgreen:
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alterhase
 
Beiträge: 12052
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Re: Klingelgenerator 60V/25Hz für altes Telefon

Beitragvon AlterMann » 24.01.2012, 14:31

AlterMann
 

Re: Klingelgenerator 60V/25Hz für altes Telefon

Beitragvon alterhase » 24.01.2012, 14:47

Elkos haben ja Leckströme.
Dieser Leckstrom des einen Elko würde den anderen Elko -den falsch gepolten- langsam Deformieren, indem die Oxydschicht (Dielektrikum) abgetragen wird. Die Dioden sorgen dafür dass sich keine Spannung die größer als die (da gibts einen speziellen Namen, der mir jetzt nicht einfällt) Edit: Umpolspannung ausbilden kann.
Löten verbindet ...manchmals. :mrgreen:
73 55
alterhase
 
Beiträge: 12052
Registriert: 14.11.2008, 08:58
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