This simple circuit will is based on the functions of IC 8038. It can generate three types of waves. 1) Square Wave 2)Triangular wave 3) Sine Wave . All the 3 waves are available at same time. The following circuit shown in the diagram will generate a 5 kHz wave.
Circuit diagram :
If you want to change the frequency of the wave then you need to change the values of R4 and R5. You can use the following formula to findout the values of the R4 and R5. Remember values of R4 and R5 should be remain same.
Formula :=> R4 = R5 = 6.3829*(10^6) / Fo
Where Fo = Output frequency.
R1 is connected to avoid distortion in the sine wave.