Home appliance repair signal generator circuit

Shown is the circuit principle circle of the signal generator . This instrument is a special instrument for debugging and repairing various receivers, recording machines, amplifiers and other amplifiers.
It has a variety of signal outputs. The amplitude-modulated
high-frequency signal is continuously adjustable and equipped with
an output jack. It is compact in appearance and easy to carry. It is an
indispensable practical instrument for electronic enthusiasts .
There is an output cable for measurement. The power
supply uses two AA batteries.
  (1) Technical indicators
  1) Intermediate frequency: 465kHz;
  2) Medium wave: 450-1700kHz;
  3) Short wave: 3. 5 ~ 13. SMHz;
  4) Audio: 1000Hz;
5) Dimensions; 122mmX 82mm×40mm;
power supply Voltage: DC 3V (two S size batteries).