Description of?electronic?assembly :LM4880?is a?dual?audio?HiFi?amplifier?IC?from?National?Semiconductor. This headphone amplifier circuit?is specifically?designed?to?produce?high quality?audio?output?with a?minimum amount?of components.?LM4880?integrated?circuit?capable of delivering?250mW?per channel?into?8?ohm?load.
IC?has a?THD?of 0.1%?and?has a?voltage range of?2.7V?to?5V?DC. In the?circuit shown?above,?the resistors?R1?and?R2?are?the feedback?resistor.
C4?and?C5?are?DC?input?decoupling?capacitor.?Filtering?capacitor?C3?provide?power?and reduce?noise.?The amplifier?automatically shuts off?when?a low?logic?level?is given?to the shutdown?pin?(pin?5).? The capacitor?C6?is?working?at?half-supply?filtering.
Hi Fi?headset?Amplifier Parts list :
R1, R2 : 20K
R3, R4 : 0.47 OHM
C1, C2 : 220uF
C3 : 0.1uF
C4, C5 : 1uF
IC : LM4880
Note that:
Assemble?this Hi Fi?headset?Amplifier?based?on?LM?4880?circuit in a?good?quality?PCB.
The headphone amplifier circuit?can?be powered?by?anything between?2.7?to?5V?DC.
A?high logic?at?pin?5 will?cause the?amplifier?shut down?mode.
For 32?ohm?headphones,?85mW?amplifier?offers?0.1%?THD.
Reprinted Url Of This Article: http://www.hqew.net/circuit-diagram/Hi-Fi-headset-Amplifier-based-LM-4880_12060.html
