1. Configuration: Pre-and power amp, motor control 2. Adoption of shock noise prevention circuitry Through the use of a circuit which suppresses noise occurring when the power supply is turned on and off, noise output is reduced without muting. 3. Stable motor speed control circuit A bridge circuit employing power transistors provides motor speed control with minimal drift. 4. Preamp off pin is convenient for radio connections 5. Radiation pin: When radio wave-induced noise is a problem, this pi.