product details: - with original IRS2092, IRFB4227.  -  electrolytic capacitor signal main circuit using the brand, the main filter capacitor using capacitance 4700UF / 100V * 2, to ensure a steady flow of power to support strong.  -   Resistance selection Rings metal resistance, the main circuit employs a precision of ± 1% metal film resistors rings, ensure the machine a good signal to noise