Hi! I aim to use a piezoelectric wafer and get it to work as a loudspeaker by supplying it with a fluctuating voltage withing the audible region. I know this can be done using a simple DC to AC invertor/oscillator circuit, but the challenge is to build it as small as possible. I looked up the working of SMD Ring-oscillators but their operating frequencies are way above the Megahertz range, so from what electronics I' am learning I don't think I can couple one of those with a piezo-wafer since the audible range of hearing for humans is 2 hertz-20 kilohertz. Can anybody help me with this problem? Where am I going wrong? Can I actually use a megahertz range ring-oscillator running off 3.3Volts to get a piezoelectric buzzer to produce sound? Are there SMD audio-oscillator chips available that can be directly coupled to a voltage source and be used to get a piezoelectric wafer to generate audible sound? I have tried my best to find a solution, but I cannot see where I' am goin wrong since I cannot find any proper "SMD audio-oscillator chips" that give an output within 20kilohertz range! ANY suggestions will be appreciated! I really need help! Thanks in advance!