The circuit is see this it , sound generator warbling tone , which hear distinct in swoop down that have a voice disturb , get more than , single tone. By the transistor Tr2-TR3 assemble the circuit tone Generator , Which frequency modulated with output of TR1 which it frequency generator saw tooth sound generator sound signal can fine can decorate with R7 effectively follow want. And still can fine C1 for make which frequency modulated change to with. By a loudspeaker that use to is supposed to impedance 35 ohm railings are if use lower this be supposed to resistors , build serial keep with. For decrease the popularity will down. And may lead output go to feed reach still power amplifier circuit , get change capacitors 4 uF. The detail is other , see in the circuit yes
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