PCBs for 0DAC

I now have some second generation prototypes built up, using PCBs kindly laid out by my gf. In this picture, the 0DAC is built from a stack of three boards. On the bottom we have the DAC and PSU, middle tier has the filter and I/V stage and at the top there's a buffer. The buffer can be implemented to drive headphones though the power supply might need to be external then due to heating concerns.

Here are the boards individually :

DAC board with 4 * TDA1387 and input buffer (HC86) and a simple PSU (TL431 and pass transistor)

Here's the part-populated filter board. The inductors go to the right, the transistors (current sources and common-base I/V) are to the left.

This is a single-ended classA buffer. The copper areas allow the SOT23 transistors to dissipate a bit more heat than normal. While its designed to drive headphones I'm re-purposing it for 0DAC to be a line-level buffer.

Discussions

Richard Dudley wrote 04/06/2018 at 12:17

My gf did the PCB designs, she doesn't mind at all sending out the gerbers to people interested in building. Note there are errors and I've not compiled a BOM yet. Schematics will come though. The 3 stack of boards will drive low impedance headphones directly yes, so long as they are sensitive enough. It only has 1VRMS output. Works great with Superlux HD668B for example.

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Krzysztof wrote 04/06/2018 at 13:21

Thanks, I will wait for schematics anxiously.

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Richard Dudley wrote 04/06/2018 at 13:42

I've put the schematics up now.

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Krzysztof wrote 04/06/2018 at 12:02

And if someone just wants to made them for themselves, would you give gerbers? Will this dac be able to drive headphones directly?

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Richard Dudley wrote 04/06/2018 at 09:06

No plans for that right now myself no. But if someone else wanted to make it available then I'd give the PCB gerbers to them to get boards made. There are a few small errors on the PCBs now as they were the first generation. 2nd generation ones will fix those.

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Satrio arif wicaksono wrote 04/11/2018 at 08:57

can i have pcb n parts from you ?

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Richard Dudley wrote 04/11/2018 at 12:23

You could have pcb and parts from me but I'm sure you'd not like the price as I'm not set up to create kits of parts. So there'd be a labour cost which swamped the parts cost. I will ask my gf if she's interested in making kits (or arranging kitting) though.

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Satrio arif wicaksono wrote 04/11/2018 at 12:49

sure, i think price is comparable with sound quality i got. I waiting news from you that you said will revision on new pcb and design

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Satrio arif wicaksono wrote 04/06/2018 at 09:03

did you have plan made it as kit ?

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How to give my listening impressions?

DAC v2 board arrives

Discussions

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