Microphone amplifier PCB only

This is a simple microphone preamplifier circuit for a wide range of microphone types, with good pre-amplification to attach to your larger stereo amplifier. This circuit is suitable for use with normal stereo amplifier line/CD/aux/tape inputs. The microphone preamplifier works great with guitar pickups, piezo disks, and can take both dynamic and electret microphone inputs (preamplifier provides power for electret microphone elements). This is a simple, easy to build circuit that is flexible and very handy when working with microphones and amplifiers.

Specifications:
* Amplification: 35dB
* Supply voltage: 9V (less than 10mA current draw)
* Dimensions: 25.4x38.1x15.24mm (1x1.5x0.6")

Component list
* R1 4.7 kohm
* R2 220 kohm
* R3 2.2 kohm
* R4 120 ohm
* C1..C4 10 uF 16V electrolytic * C5 100 uF 16V electrolytic
* D1 Red LED (3 or 5mm)
* Q1 BC547B
* SW1 on/off switch

NB: Components not included. They must be ordered separately.