I would like to show you the diagram of a simple guitar preamp unit. It's based only on eight parts (including TL071 op-amp).
The preamp is very flexible in use. Can be mounted in a guitar body - as an on-board preamp or as a part of a guitar effect pedal. It's got low power consumption - perfect stuff for work with a battery.
The preamp is based on a very popular circuit, but with this diagram you will get the clear „how to” that you can easily use in your work with guitar electronics.
