The PAM8403 is an Amplifier Board that can be powered using simple 5V input and could drive two 3W + 3W stereo speakers. It is an excellent choice for, who wants a Class-D stereo audio amplifier in a small board space.
S9015 PNP Transistor: Low Frequency, Low Noise TO-92 S9015 Equivalents and Circuit, S9015 is a well-known PNP silicon BJT transistor. This transistor is mainly designed for low gain signal amplification.
The AD633JN, AD633A are functionally complete four quadrant analog multiplier. Its includes high impedance, differential X and Y inputs and a high impedance summing input (Z) low impedance output voltage is nominal 10V full scale provided by a buried Zene