Headphone amplifier circuit was built by IC DA1 – KR1436UN1 (DIP8). This IC operated on a wide range of voltage between +2V-16V. With small current required, it can be powered by batteries. THD – 0.5%. Freq Frequency 20-20000Hz. Limiting long-term power output – 250mW 16 Ohm load and voltage 6V.
Parts list : R1 : 3K R2 : 75K R3 : 10K C1 : 0.1uF C2 : 1uF/10V C3 : 4.7uF/10V C4 : 100uF/10V DA1 : KR1436UN1
