Amplifier With LM386

Today we did an project amplifier with LM386. This amplifier is very easy to make and very compact, works with a single power source whose value can be between 4V and 12V.It is based on the use of a type LM386 amplifier, capable alone to issue a power of several hundreds of milliwatts to a load (HP) of 8 ohms, while consuming only a few mA at rest. Ideal for make a small portable battery powered amp.For an application in stereo, just to build this amp in two examplaires.

About LM386:

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.
The inputs are ground referenced while the output automatically biases to one-half the supply voltage. The quiescent
power drain is only 24 milliwatts when operating from a 6 volt
supply, making the LM386 ideal for battery operation.

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 externalresistor and capacitor between pins 1 and 8 will increase thegain to any value from 20 to 200.The inputs are ground referenced while the output automatically biases to one-half the supply voltage. The quiescentpower drain is only 24 milliwatts when operating from a 6 voltsupply, making the LM386 ideal for battery operation.

electronique_ampli_bf_lm386 electronique_ampli_bf_003_pcb_composants

P1060129 P1060143

P1060145 P1060148 P1060149 P1060150 P1060151 P1060153

Autor: Remy

Download complet project: Amplifier With LM386

2 Comments

  1. Roberto May 24, 2011 4:34 am 

    What is the capacitance of Cy??? perhaps 10uF???? it is good that ?????

  2. Anonymous May 29, 2011 3:35 pm 

    Capacitor C4 (Cy) – Bypass
    This capacitor is optional and can improve the rate of rejection of food. With a typical value of 10uF, the rejection rate reaches 50dB. 

Leave a Reply