Ultra-low-distortion Preamplifier with Tone Controls Part 2

摘要

The circuits of the optional input selector board and front-panel pushbutton board were shown in Figs.8 and Fig.9 last month. We also listed the parts required to build those two boards in that article. Fig.10 and Fig.11 show the PCB overlay diagrams for these two boards, so you can see how those parts are fitted. By the way, you don't have to build either of these boards if you don't need the ability to select between more than one set of stereo inputs. In that case, you would connect the chassis-mounted input sockets directly to CON1 and CON3 on the main Preamplifier board.