This circuit uses only two common transistors and provides good audio power in a speaker. Readers who are studying Morse Code to provide telegraphy exams, have this device as an excellent resource for their practice. 5 cm portable radio speaker. Larger speakers will also work satisfactorily. The 10 nF polyester capacitor determines the pitch of the sound obtained together with the 100k resistor. These components can be changed according to the wishes of each one.
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