QRP Sidetone Generator/Code Practice Oscillator

For use with low-power transmitters with a positive keying voltage. Q1/Q2/Q3 form a switching amplifier. When the key is pressed, the collector of Q3 goes to ground, turning on Q5 and activating IC1, an audio oscillator. Q4 drives the speaker. For use as a code practice oscillator, insert P1 and J1 and a key in J2.

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QRP Sidetone Generator/Code Practice Oscillator - Circuitos de Electronica