Touch controlled musical bell.
This
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.
Circuit diagram with Parts list.
- The circuit can be assembled on a general purpose PCB.
- Use two AA cells in series for powering the circuit.
- The speaker can be 2 W, 8 Ohm.
No comments:
Post a Comment