Simple Speaker Circuit Diagram. The schematic for simple microphone to speaker circuit is given below the circuit is exactly same as shown in the lm386 datasheet from texas instruments. Lm386 is a low voltage audio amplifier and frequently used in battery powered music devices like radios guitars toys etc the gain range is 20 to 200 gain is internally set to 20 without using external component but can be increased to 200 by using resistor and capacitor between pin 1 and 8 or just with a capacitor voltage gain simply means that voltage out is 200 times the voltage in.
If the tweeter was a cone type with 8 ω resistance then a non polarised 4 7 µf 50 v capacitor will provide crossover frequency of approximately 4000 hz. The amplifier circuit diagram shows a 2 5w 2 stereo amplifier. When we are designing amplifier circuit we should consider the input audio source and target output device or target loud speaker specification then only we can develop efficient audio amplifier.
In the circuit diagram the amplifier is shown with the respective pin diagrams.
If you want to built simple audio amplifier without messy components then you can construct simple single transistor audio amplifier circuit using bc547 and resistor capacitor. 2 5w 2 stereo amplifier. In the circuit diagram the amplifier is shown with the respective pin diagrams. This is a very popular amplifier ic and available on any electronic part store.
