Phase shift oscillator BA546
Here's a phase shift oscillator using the audio amplifier IC. As you might see in the schematic, the circuit is designed for positive feedback of the IC output to its input through R1, R2 and R3.
You can change the oscillating frequency by using different values for R1, R2, R3, C1 and C2. But don't use too high values for these parts, as the oscillation could stop.
These parts are set to a relatively low frequency. So, if you want to change their values, change them to increase the frequency, not to decrease--you can increase the frequency by using the lower value parts.
When you finish wiring, turn power on and see what happens when you change the values of parts around the IC.