Many Electronic circuit projects in simple ways of learning

LM380 Audio Power Amplifier | Bridge | Stereo

The LM380 is a power audio amplifier inside many electric appliances. For example Radio receivers, televisions, small stereo amplifiers and more. So, I will show you the LM380 circuit in my collection.

LM380 2.5W Audio Power Amplifier

Many circuit use LM380 Why? and hot to use it. I find datasheet at NT is good ICs. below is short datasheet that you can use it on basic.

The LM380 is a power audio amplifier for consumer applications. In order to hold system cost to a minimum, a gain is internally fixed at 34 dB. A unique input stage allows ground referenced input signals. The output automatically self-centers to one-half the supply voltage.

Wide supply voltage range: 10V-22V
Low quiescent power drain: 0.13W (V S = 18V)
Voltage gain fixed at 50
High peak current capability: 1.3A
Input referenced to GND
High input impedance: 150k?
Low distortion
Quiescent output voltage is at one-half of the supply
n Standard dual-in-line package

Connection Diagrams
Order Number LM380N

Order Number LM380N

Order Number LM380N-8
Order Number LM380N-8

Block and Schematic Diagrams
Block and Schematic Diagrams

LM380 audio power amplifier bridge stereo by NightFire Electronics

LM380-6W Bridge Power Amplifier Circuit

Today we come to see Bridge Amplifier very small-sized about 6 watts only. This work uses the integrated circuit number LM380 then build easy and economize good. When a friend uses 8ohm loudspeakers. Will have the electric power about 6Watt that Voltage Supply 15V or 12Volt all right. Caution be don’t give late a loudspeaker touches Ground may make LM380 can be damaged. As a result request friends have fun Main Bridge amp miniature this size please sir.

LM380-6W Bridge Power Amplifier Circuit

Simple megaphone circuit using LM380

Simple Megaphone circuit, lightweight portable size, 5-watt sound. It is suitable for you uses at any time. You do not need to speak loudly. It will boost up your voice to higher.
In the circuit using LM380 is power amplifier and output to a mini speaker. It uses 9V battery as power supply. Because we want small size and cheap. You can do it!

How the circuit works
When we press the switch-S1. The circuit is working. But no sound came out.

Simple megaphone circuit using LM380

Then, when any sounds to MIC1, a condenser microphone. It converts these sound signals to electrical signals.

Next, it comes to the potentiometer-VR1(Volume) to adjust this signal before to C1.

C1 is a coupling capacitor. It allows or filter the only audio signal through it, and block DC from the input.

The audio signal comes to IC1 LM380—Mini Power Amplifier IC—. When we use it the life is easy. It requests a few components only.

Short Features

  • Wide Supply Voltage Range: 8V-22V
  • Voltage Gain Fixedoutput0
  • Max watts ouput: 5W
  • Low Quiescent Power Drain: 0.13W (At voltage supply is 18V)
  • High Peak Current Capability: 1.3A

The higher audio signal rises out of Pin 8 to the output coupling-C5. And finally, to drive the speakers.

In addition, the R1 and R4 to protect all noise signal.

‘Microphone Preamplifier by LM837’ »

Parts you will need
IC1—LM380 mini power amplifier; Quantity:1
C1—3.3uF 25V Electrolytic capacitor; Quantity:1
C2—47pF 50V Ceramic capacitors; Quantity:1
C3—4.7uF 25V Electrolytic capacitor; Quantity:1
C4—0.047uF 50V Ceramic capacitors; Quantity:1
C5,C6—220uF 25V Electrolytic capacitor; Quantity:2
R1—10 ohms 0.25W resistor tolerance: 5%; Quantity:1
VR1—50K Potentiometer; Quantity:1

‘Simple Pre Mic Circuit’ »

This Post Has 2 Comments

  1. ur mic has 3 terminals how? 🙂

  2. it is possible to make a vocal stompbox to emulate the sound of a megaphone?

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Close Menu