To operate the circuit you need only 2.4-3.3V DC
Circuit Diagram:
Requirements:
1.8 ohm Loudspeaker
2.Bellpush
3. IC:HT-2811
4. Capacitor: 220k,3.3uf tant. 330k,4.7uf tant
5. Transistor:ZTX302,ZTX502
6. 3V DC source
7. Resistor: 680K
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