This Guitar preamp Circuit based FET can strengthen the spool guitar quite well and can distribute the signal through a long guitar cord. this Guitar based FET preamp circuit has a high input impedance and low output impedance.
Guitar preamp circuit is based FET type BS170 and a few passive components. The bias voltage on pin G (gate) is provided by two resistors R1 and R2. Both resistors serves to adjust the input impedance of the circuit guitar preamp.
BS170 is one mosfet designed for low power with TO92 packaging. For more details you can see the specs of FET through datasheet.The BS170 is here using the Motorola brand and pinout is as follows.
Guitar preamp circuit is based FET requires only a few mA current, so it can be operated with batteries.