Ultra low power buffer for instruments with passive pickups. Circuit designed by R.G.Keen.
PCB designed using SprintLayout6.
http://www.geofex.com/FX_images/Onboard_Preamp.pdf
https://www.diystompboxes.com/smfforum/index.php?topic=110259.0
PCB design: (c) 2015 by Piotr Zapart
www.hexefx.com