## BOM

REFERENCE | QUANTITY | DESCRIPTION | PACKAGE | NOTE
--- | --- | --- | --- | ---
R1, R2, R3, R4 | 4 | 1K Resistor | through-hole | -
R5 | 1 | 220 Resistor | through-hole | -
R6 | 1 | 100K Resistor | through-hole | -
R7 | 1 | 470 Resistor | through-hole | -
D1, D2, D3, D4, D5, D6, D7, D8 | 8 | BAT85 Diode | through-hole | -
D9 | 1 | 1N4148 Diode | through-hole | -
U1 | 1 | MCP3008 IC | DIP-16 | you can get these from mouser ,adafruit, even ali
U2 | 1 | 6N138 IC | DIP-8 | -
RV1, RV2, RV3, RV4 | 4 | 1K_LINEAR_POT | ALPHA | tayda ones work although shaft may be too short
J1, J2, J3, J4 | 4 | 3.5MM_JACK | THONKICONN | from thonk or 50pc from modular addict
J5 | 1 | MIDI_DIN_IN | SD-50BV | mouser
J6 | 1 | 1X1_PIN_HEADER | - | -
J7 | 1 | RCA_JACK | RCJ-024 | mouser or ali
J8 | 1 | 20X2_PIN_HEADER | long stacking header | from [adafruit] or look for similar on ebay etc
- | 1 | 20X2_PIN_HEADER | normal female header | [these] are more common and can be found anywhere

### OPTIONAL :
- some long enough screws and spacers note:measure these to hold it together.
- if you want your ic's in sockets you should buy some DIP-8 /16 also now
- if you __only__ want the _analog_inputs_ and not interested in _serial_midi_, you already have usb midi etc, then you can omit _R5_, _R6_, _R7_, _D9_, _U2_ from the BOM - see circuit schematic for details


the reason you need the second 'normal female header' is because on its own the pi3s ethernet port is too high for the gpios to connect with the board. if you are using a `piCapture` card between the pi and board you will not need this spacing.

## BUILD

start with the lowest to place components : resistors, diodes, ic's

next i would place the two headers since soldering from the top can be awkward with too many components - __NOTE__ these need to be placed __upside down!__ ,:
- _J8_ needs the pins facing up from top of pcb so the screen can go ontop and raspberry pi can go underneath
- _J6_ also needs to soldered from the top so a jumper from the pi board can be run to bottom of circuit

finally place the pots and jacks.

### rca video-out

if you want RCA video out from the pi on this pcb a jumper needs to be run from _J6_ to the composite video out on the raspberry pi board. on pi0 this is a labelled pin, however on pi3 you will need to solder directly to the board. i used a header-cable, cut one side to be soldered.

need to add some images and links to this guide !

[adafruit]: https://www.adafruit.com/product/2223
[these]: https://www.adafruit.com/product/2243