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QRP_SIDETONE_GENERATOR_CODE_PRACTICE_OSCILLATOR

2016-08-25 07:38  
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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, tuming 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.