Instruction manual

UAM4SYS • 18
to properly seat the IC. Now solder the rest of the pins. Check for any
solder bridges when you’re done.
 6. Install C26, a 0.22uF ceramic capacitor (marked 224).
 7. Install C3, a 0.01uF ceramic capacitor (marked 103).
 8. Install C7, a 0.22uF ceramic capacitor (marked 224).
 9. Install C19, a 0.39uF metal film capacitor (marked 394). Metal film
capacitors are like ceramic capacitors, they have no polarity.
 10. Install C21, a 0.01uF ceramic capacitor (marked 103).
 11. Install C15, the last 0.01uF ceramic capacitor (marked 103).
 12. Install C6, a 0.22uF ceramic capacitor (marked 224).
 13. Install C20, a 0.39uF metal film capacitor (marked 394).
 14. Install C8, a 0.22uF ceramic capacitor (marked 224).
 15. Install C16, a 10uF electrolytic capacitor (marked 10uF). Remember
to check polarity.
 16. Install C4, another 10uF electrolytic capacitor (marked 10uF).
 17. Install C22, you guessed it another 10uF electrolytic capacitor
(marked 10uF).
 18. Install C9, yet another 10uF electrolytic capacitor (marked 10uF).
 19. Install C18, the last 10uF electrolytic capacitor it this circuit (marked
10uF).
HA. HEADPHONE AMPLIFER CIRCUIT
We have preinstalled the surface mount (SMT) IC’s U11 and U12 for you.
 1. Install R34, a 150 ohm resistor (marked Brown, Green, Brown).
 2. Install R35, another 150 ohm resistor (marked Brown, Green, Brown).
 3. Install U10, a DS1669 digital rheostat IC (marked DS1669). Install this
IC like you did U1 and U3.
 4. Install C38, a 0.22uF ceramic capacitor (marked 224).
 5. Install C37, another 0.22uF ceramic capacitor (marked 224).
 6. Install C45, a 10uF electrolytic capacitor (marked 10uF). Very good