This circuit is from an Italian magazine Radio Elettronica of January 1977. The circuit shows how to implement a circuit that produces sounds of frequency determined by the capacitor and reproduced in a loudspeaker. The supply can be done with voltages of 12 V. The transistor can be the BC558 for T1 and for T2 the BD135 or TIP31 and for T3 the 2N3055 mounted on a heat radiator.
| Clique na imagem para ampliar |
