This circuit generates 5 notes in sequence, which are programmed in the connections of the 4017 outputs. Instead of a speaker in series with the capacitor and resistor at the output of the 555, we can connect a piezoelectric transducer. The speed of the effect is adjusted in RV1 and the power can be made with voltages from 6 to 12 V. C4 determines the notes and can be changed over a wide range of values.
| Clique na imagem para ampliar |
