Top Drive Preamp Rev. B
Circuit Design: Chris Moir (PDF Electronics)
Layout: Gino Maisano (Pitch Black Electronics)
Organized by: Curt (eFX-Tronics)Build InformationSchematic:http://www.mediafire.com/?y2czhhuhheeLayout:http://www.mediafire.com/?zzmjztzy4znBill of Materials:http://www.mediafire.com/?zlnmty3nhjmWiring Diagram:http://www.mediafire.com/?sharekey=0e0c ... f6e8ebb871Graphic Diagram:http://www.mediafire.com/?sharekey=0e0c ... f6e8ebb871
Note from Gino:
In the bill of materials I specified parts that can be found at major parts distributors (Digi-Key, Mouser, etc.). However, I specified a WIMA cap (item 5 on the BOM) and those are usually found at Mouser. If you absolutely have to use Mouser exclusively (I don't know why), Digi-Key part numbers can be searched for in Mouser. These are the part numbers on Digi-key's website that end in "-ND". Also, if you are looking for a particular part number, FindChips.com is very handy as it searches multiple distributors, including Digi-Key and Mouser.
I also included as much relevant pricing information as possible. For those of you who ordered more than one board, you can input the quantity in cell B7 and the prices should adjust accordingly. Obviously price breaks are not calculated, but at least this will give you a general idea of cost. I also left a few columns in that I use when finding parts for a job. For example, the "Stock?" column allows me to mark whether I've got the part in stock already or if I have to order it.
I tried to make the layout somewhat modular in that you don't have to directly solder the wires to the board if you don't want to. In the "Optional Parts" section I have included connectors and latching headers for the tubes, input/output connectors, FET switch and the XLR cable connection. Also, Chris highly recommends the use of a heat sink for U1.
Also, the layout facilitates board-mounting the pots but obviously this isn't required.
I must point out one goof on the layout though. The caps in the charge pump section, C1-C7, are 10uF 63V electrolytics. The footprint I used for these caps is way too big so the board will end up looking funny when it's done. Sorry about that. This is a better goof than the footprint being way too small though. If you would like your board to look nice, go with a 10uF 450V cap and it'll be the right size. It will affect the circuit in no way.
Good luck and happy building!