Qrp Sidetone Generator Code Practice Oscillator Circuit

  
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.
Qrp Sidetone Generator Code Practice Oscillator Circuit - schematic

For use as a code practice oscillator, insert PI and J1 and a key in J2.




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