10_NOTE_SOUND_SYNTHESIZER

Published:2009/6/18 22:52:00 Author:May | From:SeekIC

As shown, three ICs are used to produce the sounds. IC1 is a 555 timer that generates clock pulses. It is configured as an astable multivibrator. The frequency of the clock pulses is set by trim-mer potentiometer Pl. These clock pulses are coupled to the input of IC3 (a 4017 CMOS Johnson counter) on its clock input pin 14. Each clock pulse causes IC3 to shift a high to each of its output pins in sequence. A trimmer resistor, which can be adjusted to set a different frequency for each note, is connected to each of 103's output pins. One side of each of the trimmers is connected to pin 5 (the control voltage pin) of IC2.IC2, another 555 timer IC, creates the tone; the overall pitch of the tone can be varied by P2. As the output sequences from the 4017, that tone, which is changed in frequency by each output shift is applied to a srrtall speaker from pin 3 of IC2. An LED, which flashes with each clock pulse, is con-nected to pin 3 of IC1. Switch S2 is used to vary the sound between flowing and distinct notes.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Audio_Circuit/Tone_Control/10_NOTE_SOUND_SYNTHESIZER.html

Print this Page | Comments | Reading(3)