Low Voltage Bridge Audio Amplifier

Amplifier Circuit — Sat, 29 Oct 2011 13:40:27 +0000

Audio bridge amplifier schematic. This Low voltage bridge audio amplifier circuit is for low voltage applications requiring high power outputs. Output power levels of 1.0 W into 4 ohm from 6 V-and 3.5 W into 8 ohm from 12 V are typical.

" data-image-caption="" data-large-file="https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/10/audio-bridge-amplifier.jpg?resize=630%2C380&ssl=1" class="aligncenter size-medium wp-image-716" title="audio bridge amplifier" src="https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/10/audio-bridge-amplifier-300x173.jpg?resize=300%2C173" alt="audio bridge amplifier" width="300" height="173" srcset="https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/10/audio-bridge-amplifier.jpg?resize=300%2C173&ssl=1 300w, https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/10/audio-bridge-amplifier.jpg?w=718&ssl=1 718w" sizes="(max-width: 300px) 100vw, 300px" />Low voltage bridge audio amplifier based on op amp IC LM386 (Low Voltage Audio Power Amplifier). Application of this circuit include AM-FM radio amplifiers, Portable tape player amplifiers, intercoms, TV sound systems, Line drivers Ultrasonic drivers, Small servo drivers Power converters. This circuit can be operated by battery power.

This Low voltage bridge audio amplifier circuit is for low voltage applications requiring high power outputs. Output power levels of 1.0 W into 4 ohm from 6 V-and 3.5 W into 8 ohm from 12 V are typical. Coupling capacitors are not necessary since the output dc levels will-be within a few tenths of a volt of each other. Where critical matching is required the 500 K potentiometer is added and adjusted for zero dc current flow through the load.

Parts list :LM386 pin out. The LM386 is a power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to 200.

" data-image-caption="" data-large-file="https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/10/LM386.jpg?resize=197%2C119&ssl=1" class="alignright size-full wp-image-717" title="LM386" src="https://i0.wp.com/amplifiercircuit.net/wp-content/uploads/2011/10/LM386.jpg?resize=197%2C217" alt="LM386" width="197" height="217" />
R1, R2, R3, R4 : 270 ohm
R5 : 2,7 ohm
VR1 : 10K
VR2 : 500K Variable
C1, C2 : 20uF
C3 : 0.05uF
C4 : 0.1uF
IC1, IC2 : LM386

Note :

Vs = 8V RL = 4 ohm Po = 1 W

Vs = 12V RL = 8 ohm Po = 3,5 W

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Low Voltage Bridge Audio Amplifier