a simple tone sounder circuit

Crystal oscillator
Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle
Photocoupler

Description

Here, we present a simple and low-cost tone generator circuit, a jingle bell suitable for calling bells.sround around the integrated circuit 8021. It is an 8-pin IC, but there are only four pins. The 8021 has a built-in circuit to generate a clanging sound whose 3rd pin is pulled low. The sound is stored in a 4-bit ROM.a complementary pair of each time, two transistor amplifiers are used to amplify the sound, a fair level audibility.A piezoelectric tweeter or 8 ohm, 500mW speaker can be used for output. Each time the switch S2 is pressed, the jingle is doubled. If you try to press the switch S2 a first beep is still in production for the second time, it has no effect on any, two jingle bells sounds always produced. S1 ON-OFF switch.Assemble circuit is good The quality of all the PCB.Don't forget to use the 8021 IC IC for people.

Circuit diagram of the audio generator

Tone generator circuit

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