This is the circuit of amplifier using IC LA4440. The amplifier circuit uses very less components but a very high quality with respect to its cost and ideal for beginners.

IC LA 4440 is wired as a bridge amplifier to deliver a 19 W Rms on a 4 Ohm speaker atau 6 W rms jika di fungsikan stereo. The IC has built in thermal over voltage and short circuit protection.The IC also incorporates a audio muting function.

Rangkaian 19 Watt Bridge Amplifier LA4440

Rangkaian 6 Watt Stereo Amplifier LA4440

Notes:

• Use a 12 VDC / 3 A power supply, IC LA4440 can with stand up to 18 volts, but I prefer it should not be nothing more than 16V.
• Do not forget to fit a proper heat sink with IC.
• Use a 4 Ohm speaker

IC LA4440 Features

• Built-in 2 channels enabling use in stereo and bridgeamplifier applications. (Stereo 6 Watt Bridge : 19W)
• Minimun number of external parts required.
• Small pop noise at the time of power supply ON/OFF and
• good starting balance.
• Good ripple rejection : 46dB (typ.)
• Good channel separation.
• Small residual noise (Rg=0).
• Low distortion over a wide range from low frequencies to high frequencies.
• Easy to design radiator fin.
• Built-in audio muting function.
• Built-in protectors.
• Thermal protector
• Overvoltage, surge voltage protector
• cPin-to-pin short protector

Quick Data IC LA4440

• Maximum supply voltage.............................18 V.
• Allowable power dissipation Pd max............15 W.
• Operating temperature Topr........................–20 to +75.
• Storage temperature Tstg............................–40 to +150.
• Voltage gain VG..........................................49.5 to 53.5.
• Output power PO....................................... Stereo 06 W, Bridge 19 W.
• Input resistance ri ............................. ....... 30kOhm.