Overview

NOTE: There have been two sets of MB-808 pcbs and each has shipped with a different set of parts.

As a minimum, you should order everything on the Mouser parts list and on the Digikey parts list.

In addition to that, everyone will need a mounting panel, knobs, and 3mm leds (SmashTV sells 100 packs for a very good price if you don't mind the 4-5 week delivery time), MIDI connectors, heatsinks for the three regulators, fuse(s) for the mains input, standoff washers and screws, plus some kind of case, and second batch people will need to order the lighted switches (see forum for sources, including group buy).

Options

Front panel notes: There are two options for mounting the pcb to the front panel - 1) use the .375 standoffs with washers to clear the .400" height of the RK09L potentiometers, or 2) use the washers and nuts on the potentiometers to mount the panel. When you use the standoffs, you won't have to worry about covering up the potentiometer washers and nuts, but if you use the washers and nuts, we'll be able to complete the graphics (no screws getting in the way), plus we won't have to worry about a possible shock hazard with the first batch of boards. The number of standoffs listed on the BoM has been incorrect before rev 4.4 - there are actually 13 mounting holes in the pcb, so if you use option one, you'll need 13 standoffs with washers and screws. If you use the potentiometer mounting method, you'll still need four standoffs to support the momentary switches at the bottom of the board.

Potentiometers and encoders - the 9mm potentiometers on the BoM are a different type than the ones included in the kit. If you're interested in having them all be the same, don't order the ones on the BoM and check out this topic on the forum for discussion. Also, the 24 detent encoder listed is 5mm shorter than the rest of the pots. While the 18 pulse per full rotation encoder is the correct height, you might consider a 12 pulse per rotation version since there are 12 voices in the basic MB-808 setup. I'm having a distributer give me a quote on the correct size encoders. For those of you who want to look for them yourselves, here are the part numbers (all Bourns):

"RT" switches at top of panel are optional and may not be needed if the optional mixer/effects add-on panel is used.

If you're interested in using anything in the aux section, you'll have to buy the appropriate sized potentiometers and/or DPDT switches. For each potentiometer, you'll need a 3-pin header, and for each switch, you'll need two 3-pin headers - you can just add another 40 pin breakaway header for this.

If you are planning to use an LCD, you'll have to add in two 10k trim pots and one BC337 transistor, along with the LCD itself and a ribbon cable. Looks like you should also get a 16 pin DIL (two row) header.

If you are going to build any of the options (909 voice add-on panel, mixer/effects add-on panel, LCD meter bridge) you have two options. Now that we have 2A regulators, (thanks to SmashTV for the link to the +5V 2A regulators - it was easy to find the other two once I knew where to look!) you can run those options from the psu on the main board. You also have the option to leave off most of the power supply components and mount them on a separate power distribution board. (See minimal BoM for what is needed for that.) Also, it is probably a good idea to upgrade the transformer for the extra add-ons - as a matter of fact, I went ahead and modified the Digikey BoM to list the 25VA transformer - if you know that you will not add any of the options, the original 62053 will be fine. If you already purchased the 62053 transformer, but want to add options, you can supplement it with a 62050.

Wiring options - pin headers are included for most connections (but not the aux section). You can solder connector wires directly onto the PCB, but it's easier to assemble and disassemble if you use the headers. As of B0M version 4.8, I have included the crimp pins and housings that you'll need to attach to the connecting wires. One of the 3-pin and ten of the 2-pin connectors are used to access the instrument triggers - if you don't want to access the triggers, you can delete those headers and crimp pins from the BoM.

PLEASE NOTE: I am not an Excel expert by any means - I don't know how to modify the sheet so that the links to the Mouser web pages are correct. Also, I have not reconciled the costs between the spreadsheet and the Mouser site - don't go by the costs in the spreadsheet - let your Mouser Shopping Cart be the final answer.

Parts Lists

How to Order Parts from Mouser

Once you have an acount, you can also click on this direct link.

Release Notes

March 17, 2008 - Version 4.9

Reconciled individual parts lists with the main bill of materials. We were missing one resistor and one capacitor - not too far off, considering how many parts there are! There were also a lot of extra parts listed, so I have removed them.

March 11, 2008 - Version 4.8

Eeek. It looks like those friction lock headers won't fit in most places. They still work in the two locations in the power suppply section, but there doesn't seem to be enough room for them anywhere else!

March 5, 2008 - Version 4.7

Changed the pin headers to the friction lock type - that way they're "keyed" and only go on one way - especially important on those power connections...

March 4, 2008 - Version 4.6

Deleted the 3-pin headers for the aux section - if you want to use the aux section, you'll have to order potentiometers and/or DPDT switches, so I thought we should put the headers in that same optional category too.

February 11, 2008 - Version 4.5

Finally found 2A positive voltage regulators and a 1.5A negative one!

Upgraded polyester film capacitors from 10% tolerance to 5% - some of the 10% parts are not stocked and have already been replaced with 5% ones anyway. If you don't want to spend the extra three bucks for the better tolerance parts, change the last letter of the part designation from "J" to "K".

February 10, 2008 - Version 4.4

Changed noise section parts based on post in Assembly forum.

Changed after analysis of potentiometer data sheets.

Changed after double-checking panel mounting options.

Changed the basic Excel spreadsheet a bit - minor updates for consistency, plus grouped parts together and added two new areas: parts that are optional, and parts that are included. Deleted two 10k trimpot for consistency - the BC337 transistor for LCD control wasn't included already.

Changed the Digikey list - changed the 15VA transformer to the 25VA version.

February 3, 2008 - Version 4.3

Changed - post to forum relayed from TK

January 28, 2008 - Version 4.2

Changed - private communication from Moogah:

January 27, 2008 - Version 4.1

Added from Dec 15 post in "Mouser order B0M" thread:

NOTE: Dec 15 forum post calls for 5x 100R resistor networks - should be 5x 220, 2x 100. Corrected spreadsheet.

Added from DOUT assembly instructions:

Uploaded to Mouser and had to make these changes: