The PCM1794 expansion boards arrived

Yesterday I got the PCM1794 expansion boards for the main-/expansion board DAC project.

4-layer boards that came out quite nice. As the last time I used elecrow, I got twice the number of boards expected.


/Mayday

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DAC mainboard

Got some more parts populated on the first of the DAC mainboards today and got most of the missing parts for the mainboard and the PCM1794 expansion board ordered from Mouser.



/Mayday

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Parts.

It’s time to put together another order from mouser. I only send an order off when I have reached the free shipping limit. If I didn’t do that, shipping cost would be half the order total.
I do order small quantities from time to time from micro-kit (great to get Elfa disrelec and Farnell stock at one place) or electrokit.

Mouser was the only source I found for the large size SMD resistor nets I used on the DAC mainboard.

I got some Vishay thin-film .1% resistors for the same board (these are for the LT1963’s and the LT3042IMSE).

As luck would have it, they (mouser) also had the big size SMD oscillator, 22.5792Mhz I still needed to source for the Audio-widget/FreeDSP classic SMD.

Funny thing about that board (Audio-widget/FreeDSP board), it’s the first time I’ve got all parts, but in too small sizes.

I mainly use SMD’s to keep boardspace down, so I mainly use 0805’s with the occasional 0603, 0402 and sometimes 1206 resistors for the extra power handling.

If a TH part lets me do a better layout/smaller board, I’ll use it so I’m not biased one way or the other. 

Anyway, I noticed that mouser has lifted the free shipping limit from 40eur to 50eur since I last ordered from them.

/Mayday

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DAC mainboards

These arrived today 🙂

For more info look on the DAC/Mainboard-page.

Pics(bad cellphone pics I’m afraid).

These I had made at elecrow, soon after having ordered these and the 4-layer PCM1794 expansion boards, I noticed the “Premium PCB Service”. It’s only $1, if it’s for the lot or per board I don’t know.

It is a visual inspection of the boards in addition to the electrical test. It also allows for thicker copper, thinner traces, smaller vias etc.

See below:


/Mayday

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Audio-widget & FreeDSP 

The board has gotten some more parts populated.

There are still some parts that I don’t have in the right size or of good enough quality. For capacitors I use C0G/NP0 or PPS where possible and X7R where there’s not enough room for better capacitors.

Resistors are ordinary 1% metalfilm.


Some of the values are yet to be derived from audio-widget and FreeDSP classic schematics.

/Mayday

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Audio-widget & FreeDSP

I got a board combining the two from a member of DiyAudio.
The board had some errors and I didn’t get any BOM. Anyway, I’ve begun populating the board.

The main problem is that most of my SMD resistors and capacitors are size 0603 & 0805, this board use 1206 size parts.

I have most parts on the way, this will make 3pcs of FreeDSP classic and 4pcs of audio-widget boards for me lol.

/Mayday

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Audio-widget

First board programmed and recognized as an USB audio device 🙂



/Mayday

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