دائرة جرس باب Simple Door Bell Circuit

دائرة جرس باب Simple Door Bell Circuit

دائرة جرس باب Simple Door Bell Circuit

Circuit Description

The circuit
diagram of door bell circuit using UM 66 IC has been published here. This is the
simplest door bell circuit in which the central part is the IC UM 66 as the name
says. The difference of this circuit with the melody generator circuit is that
the melody generator plays music till you release the switch after pressing
whereas in this circuit, after one press full song will be played. In this
circuit if once switch is pressed, the capacitor C1 (220 uF) gets charged and
the transistor Q2 (BC 548) keeps the IC for playing music till its end. The
charging time of the capacitor C1 determines the music playing time of IC UM 66.
This can be adjusted by the potentiometer R1 (100K). The speaker K1 is driven by
the transistor Q1 (BC 548).
Circuit
Diagram

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]

Notes

The voltage given to UM 66 IC should not be
larger than 4.5 V.
Adjust pot R1 to select the playing time for
music, whether full tone or a part in one press.
POT R2 is optional but if included, the
loudness can be adjusted.

دائرة جرس باب Simple Door Bell Circuit

دائرة جرس باب Simple Door Bell Circuit

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