Schematic for THAT Thing, a do-it-yourself preamp/electronics project by Curt Yengst, featured in the Jan. 8, 2020 issue of Radio World.Full schematic, including power supply, for THAT Thing, a do-it-yourself preamp/electronics project by Curt Yengst, featured in the Jan. 8, 2020 issue of Radio World. (Click here to enlarge.)