Amplifier

I’m looking for a portable amplifier design and preamp as well . This device needs be power up with (1) 9v battery . For the control part will be (2 ) potentiometer which is volume control and sensitivity control for 5v vu meter ( analog type). Switches (4) angle toggle switch for power on -off, background noise filter. External connection will be (3) which is output aux jack for headphone , input 3pin xlr jack, and output aux jack for recording sound that amplified .