The LM386 is a low voltage audio power amplifier. It can provide 125mW to 750mW, enough for any project that uses audio. This circuit can work with batteries, requieres minimum external parts and works from 4 to 18 Volts (contact the manufacturer or read the technical info. Some versions works only with 5 to 15V.)
- . Also the UTC LM386 is a power Amplifier, Designed for use in low
Consumer Voltage applications. The gain is internally set to 20 to keep external part count low, soft the addition of an external resistor and Between condenser pin 1 and pin 8 Will Increase the gain to Any value up from 20 to 200. The inputs are ground referenced output WHILE the Automatically One-Half biases to the Supply Voltage. The quiescent power drain is Operating when- only 24 milliwatts from a 6 Voltage Supply, Making the LM386 ideal for battery operation.
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The pin out of the LM386 is as th follow
Pin 1: Gain
Pin 2: Input -
Pin 3: Input +
Pin 4: ground
Pin 5: Vout (output)
Pin 6: Vs (Power)
Pin 7: Bypass
Pin 8: Gain
The input obviously goes to pins 3&2. The most interesting part about this chip i feel is the gain function. If you put a capacitor between pins 1 and 8, you can control the amount of gain the amp has. The bypass allows you to access the input un-amplified, if you so desire.
To do this magnifying the voice we must have to test the connection in bread board
This version is completed by using minimal parts, you will need:
1 : chip LM386
2 : Capacitor 1000uf 25v
3 : Putintometer 10K
4 : Battery 9v
5 : 8ohm Speaker
6 : 1/8" mono audio jack
7 : Bread board and some wire
Step 3: Amplifier With Pcb
now after testing the bread is presented in relation to the PCB board with concise capture all points
with a related care and proper function has become the magnifying
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