anevilspar7an
Well-known member
- Build Rating
I feel like I can post this since I pulled every component and piece of hardware to start with the bare pcb. I started off with the schematic for my modded ShamWah to adapt it to the Ernie Ball board. Since I'm using 18V for this I changed the power section to accommodate. The 1N4001 polarity (not) protection was swapped with a 1N4746A zener. The input cap was increased for better bass response, same with the cap after the JFET buffer. The 2N5088 transistors were swapped for BC549B in Q2, BC549C in Q3, and a BC517 Darlington in Q4. The J201 input buffer sits at a perfect 9V with the 5K1 source resistor. R13 was increased to 2K4 for some more mids, R7 decreased for a little more low end gain, R22 is jumpered since I am using a different inductor from stock. C8 is quadrupled to 22uF for a deeper sweep, C7 is increased to 100nF for a wider range, C4 and C6 were increased and to 680nF and 330nF respectively for a slightly different filter response. The cap before the output buffer C5 was increased for more bass. C8 and C9 were swapped for tantalum as per Chuck's recommendation for caps in the audio path. The inductor is handwound by our favorite 2D anti-establishmentalist, @Stickman393 but I can say that the Dunlop EVH 562mH inductor is a fantastic drop in.
