Addition variable gain amplifier
Variable gain above is a circuit that is used to increase signal strength in dB , needed in a circuit of gains if the range is less reinforcement amplifier input signal, and the required input signal must be high enough so that the circuit is less then the maximum amplifier sound output. For the use of gain can be placed and connected directly to the input amplifier. Part List : R1___15K R2___4K7 R3___15K R4___4K7 R5___180R R6___2K RV1__10K Trim U1___NE5532