miércoles, 23 de junio de 2010
The external parts shown on diagram 3.1 can be selected to get the desired gain. Circuit A will give a voltage amplification of 200. Circuit B will give a gain around 50. The circuit C is not for voltage amplification but will raise the bass level by about 5 dB. Take note that the circuit C is to be connected between pins 1 and 5 of the IC.
The power output is around 550 mW at 16 ohm speaker impedance. This audio frequency amplifier is ideal for small battery powered devices.
If you use the external circuit A, replace the Rx with a jumper wire in the PCB. If you use the external circuit C, solder the additional resistor and capacitor to the PCB points labeled Rt and Cy.
http://electroschematics.com/552/lm386-audio-amplifier/
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