Qrp Sidetone Generator Code Practice Oscillator Circuit

Posted on Aug 27, 2012

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
Click here to download the full size of the above Circuit.

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

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