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    This touch controlled musical bell circuit circuit produces a musical tone whenever someone touches the touch point designated as TP in the circuit. The circuit works from two AA cells and produces enough sound.

    The circuit uses IC UM 3481 commonly used in musical circuits. The IC contains a ROM with 512 musical notes, tone generator, rhythm generator, modulator, run off control, oscillators, frequency divider and preamplifiers,. So a very few number of components is required for this circuit.C1 and R1 act as the timing components for the built in oscillator. The transistor Q1 is used for driving the loud speaker. The base of the transistor Q2 is used as the touch point to trigger the musical bell.

    Touch musical bell circuit diagram

    touch musical bell circuit schematic

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    3 Responses to "Touch Controlled Musical Door Bell"

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    1. ARCHANA says: on April 9, 2011 at 11:58 am

      ACCURATE INFORMATION SHOULD BE GIVEN

    2. Dilip entoor says: on December 26, 2011 at 1:45 pm

      This circuit dgm is not working properly.. It gives some sort of disturbance noise in the spkr output..
      The transister TP works better than 555..

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