Simple Gain Regulated Pre-Amp Single NPN Circuit

1x NPN BC546/2N3904 or equivalent 2x 10nF(Treble)~0.1ųF(Bass) Capacitors 1x 7.5kOhms resistor 1x 100kOhms resistor 1x 100kOhms end-to-end potentiometer IT IS NOT A FULL AMPLIFIER It's meant to be connected to a second stage. Works with 3~9 Vdc.