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DT JFET Pre Updates!!!

A project log for Audio Blox: Experiments in Analog Audio Design

A Project page to host and blog about my various analog audio circuit experiments and designs.

AVR (lordKiCAD)AVR (lordKiCAD) 10/11/2016 at 23:280 Comments

Hey so its been a while since I touched this project but it hasn't been forgotten. A user on this site was very interested in the DT JFET Pre I designed within this project, so I got back to work on it :).

So when I went to get PCBs ready to order I realized that the git commit with the finished board was never pushed. At the time I couldn't find where I put my laptop's backup so the board was essentially lost. I decided to redesign the board in KiCAD, its a little bigger but here it is:

OSHPark Renders:

Top:

Bottom:

So after doing a quick redesign I produced gerbers and did a quote with OSHPark to have it made. Around the same time I was ordering some other boards and found out that I had my laptop's backup on a flash drive when shuffling through files. So I decided to order both versions from OSHPark and they arrived today:

Also in this update I have the bill of materials, which are viewable below and available as open document format in the files section of the project page. The BOM:

SymbolValuePackageQuantityDigikey Part NumberManufacturer Part NumberPriceComment
C14.7uF4X6mmCAP1493-10381-2-NDUMW1V4R7MDD1TP$0.36
C2, C310uF4X6mmCAP2493-10354-1-NDUMW1C100MDD1TP$0.36
P1, P2, P3, P4Header 2HDR1X24Header 2
Q12N5457TO-92A12N5457-ND2N5457$2.19
R16.8KR080511276-5320-1-NDRC2012F682CS$0.10
R23MR080511276-5448-1-NDRC2012F305CS$0.10
R32.2KR080511276-5290-1-NDRC2012F222CS$0.10
R451KR080511276-5379-1-NDRC2012F513CS$0.10
Total$3.31

Its a pretty inexpensive build even including the PCB cost which were around 4 dollars each for a round of three from OSHPark. Now we wait on a digikey order to arrive and we're off to the races, stay tuned for more to come!

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