TurboCPU DAC/CV Option – New Parts Source?

I made an interesting discovery on the web today. There are a lot of companies making “Breakout Boards” and “SMT to DIP Adapters” but I’ve never found an assembled one for the MCP4728 DAC used in the TurboCPU’s CV/DAC option … until today!

From here:  http://www.proto-advantage.com

I just ordered one assembled breakout board (DAC chip and pins installed) as well as just a blank board with machine pins. I will test them both out. If it all works out then this is a good place to order these parts from because making the CV Option is a major bottleneck for me.

Here are the parts I ordered:


MCP4728 Breakout Board, chip included, assembled.


Part Number: PA0027-MCP4728, MCP4728 Breakout Board

MCP4728 DAC breakout board, unassembled, DAC not included.

MCP4728 DAC breakout board, unassembled, DAC not included.


Part Number: PA0027, unassembled with machine pins, ROUND.

A few things to note about this right up front. Since the beginning of 2014 I have added a second area on the TurboCPU’s MIDI board to put the DAC chip on. The original area is the tiny MSOP-10 footprint, the new area is a 10-pin DIP footprint.

MIDI board showing both DAC locations (in red)

This has allowed me to order MSOP-10 to DIP adapter boards… which makes assembly a bit easier.  To date I’ve been using adapters from




but this new discovery from Proto-Advantage is very exciting! Now, because I’ve also been installing a 10-pin DIP socket I think the round machine pins are the better way to go as I’ve never really liked the idea of jamming square wire-wrap pins into a DIP socket.

The other alternative is for me to leave off the DIP socket and just allow you to solder the Proto-Advantage fully assembled breakout board right on the PCB. Once I get these and test them out I’ll decide which route to go.

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2 Responses to TurboCPU DAC/CV Option – New Parts Source?

  1. grantb4 says:

    I’m working on a Rev D version of this board that will remove the DAC SMD part completely and instead offer better support for the DAC daughter PCB. I will enlarge the holes to accommodate the Proto-advantage.com square pins and I’m going to run separate traces for the VCC and GND to the analog part(s). Finally I will add another 10uF cap and a 0.1uF cap near the DAC daughterboard.

  2. grantb4 says:

    As mentioned, this is the part number to order the finished board that can be installed (through-hole soldered) onto the recent versions of the TurboCPU’s MIDI board:


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