Group Buy: USB -> SPDIF PCB

[iamwhoiam]

There is a USB -> SPDIF pcb group buy over at head-fi. The corresponding diyaudio link is here:

http://www.diyaudio.com/forums/showt...&postid=595155



It is based upon the TI, PCM2902 chip. Shipping and fees will be £1.50 internationally, and £1 to the UK, regardless of the number ordered. Please note, this design has NOT been prototyped, you are buying as is!

Current price for 75 boards: €2.04 ($2.72)

The head-fi group buy link is here!

The original project log is here


If you aren't registered at head-fi.org ... pm Nisbeth and I'm sure he'll be able to transfer your details to guzzler at head-fi.org


Parts list:

1 x PCM2902 (SSOP28)
1 x 74HC04 (SO14)
1 x TPS793 4.75V (SOT23-5) (possibly optional)

1 x 560µF 6.3V Panasonic FC
2 x 22µF 10V OS-CON SC (or equivalent similar, FCs are fine)
4 x 1µF Wima MKS-02 (or similar, tantalum should be ok, 2.54mm pitch)
1 x 100nF 5mm (0.2") pitch capacitor (Wima MKS-2 or similar)
5 x 100nF 0805 ceramic capacitors
1 x 10nF 0805 ceramic capacitor
2 x 33pF 0805 ceramic capacitors

1 x 1M 0805 resistor


1 x 1K5 0805 resistor
2 x 22R 0805 resistor
1 x 91R 7.5mm resistor (Vishay Dale appropriate, or generic 1% metal film)
1 x 360R 7.5mm resistor (Vishay Dale Appropriate, or generic 1% metal film)
1 x generic resistor for LED, V ~ 4.5V

1 x 12MHz HC49 crystal oscillator
1 x 10µH 1210 package inductor
1 x USB B-type connector
1 x 3mm low voltage LED
1 x RCA socket
1 x case
1 x USB cable

Digikey Codes:

# Descr .................................................. .......... Digikey Part #..........Price / min quantity

1 x PCM2902 (SSOP28) ................................................. 296-12986-5-ND ........ $9.00 / 1
1 x 74HC04 (SO14) .................................................. . 296-12883-1-ND ........ $0.44 / 1
1 x TPS793 4.75V (SOT23-5) <-- pain to solder! ....................... 296-12160-1-ND ........ $1.14 / 1

1 x 560µF 6.3V Panasonic FC .......................................... P12705-ND ............. $0.48 / 1 (backordered)
2 x 22µF 10V OS-CON SC (or equivalent similar, FCs are fine) ......... P11213-ND ............. $0.32 / 1 (inexact match - 25V (6.3V available))
4 x 1µF Wima MKS-02 (or similar, tantalum should be ok, 2.54mm pitch). 399-1337-ND ........... $0.41 / 1 (tantalum - 25V)
5 x 100nF 0805 ceramic capacitors .................................... PCC1843CT-ND .......... $0.06 / 10 (panasonic ecg)*
1 x 100nF 5mm (0.2") pitch capacitor (Wima MKS-2 or similar) ................ 495-1103-ND .... $0.17 / 1 (EPCOS INC)*
1 x 10nF 0805 ceramic capacitor ...................................... PCC1991CT-ND .......... $0.09 / 10 (panasonic ecg)
2 x 33pF 0805 ceramic capacitors ..................................... PCC330CGCT-ND ......... $0.05 / 10 (panasonic ecg)

1 x 1M 0805 resistor ................................................. RR12P1.0MDCT-ND ....... $0.15 / 10 (sasumu 0.5%, .1W)
1 x 1K5 0805 resistor ................................................ RR12P1.5KDCT-ND ....... $0.15 / 10 (sasumu 0.5%, .1W)
1 x 91R 7.5mm resistor (Vishay Dale appropriate, or generic 1% metal film) ... P91.0CACT-ND .. $0.17 / 10 (Panasonic - ECG)*
1 x 360R 7.5mm resistor (Vishay Dale Appropriate, or generic 1% metal film) .. P360CACT-ND ... $0.17 / 10 (Panasonic - ECG)*
2 x 22R 0805 resistor ................................................ RR12Q22DCT-ND ......... $0.15 / 10 (sasumu 0.5%, .1W)

1 x 12MHz HC49 crystal oscillator .................................... CTX058-ND ............. $0.94 / 1
1 x 10µH 1210 inductor ............................................... DN10103JCT-ND ......... $1.02 / 1
1 x USB B-type connector ............................................. WM17109-ND ............ $1.94 / 1
1 x 3mm low voltage LED .................................................. .. HLMP1700-ND .... $0.35 / 1 (Fairchild Opto)*
1 x generic resistor for LED, V ~ 4.5V ...................................... 4.32KXBK-ND .... $0.10 / 5 (Yageo -- you should check my math to see if this is actually appropriate, I just guessed )*
1 x RCA socket
1 x case
1 x USB cable

[guzzler]

guzzler's also registered here

g

[iamwhoiam]

Target of 75 boards has been reached.

Next target:

Current price for 100 units: €1.83 ($2.47)

[Jean]

I tried following a couple links to find out what this thing an be used for ? In a nutshell, what's a good use for it ?

[jleaman]

Originally posted by Jean
I tried following a couple links to find out what this thing an be used for ? In a nutshell, what's a good use for it ?

I second This..

[guzzler]

It will give you S/PDIF output from the USB port of a computer using any OS that natively supports USB (WinXP, Linux, Mac OSX etc). Particularly handy for laptops, or PCs with no digital output to a DAC.

g

[paologatto]

Originally posted by guzzler
It will give you S/PDIF output from the USB port of a computer using any OS that natively supports USB (WinXP, Linux, Mac OSX etc). Particularly handy for laptops, or PCs with no digital output to a DAC.

g

..and from the PCM2902 you can have also S/PDIF input and analog in/out.

In this project these features are not implemented, but the chip's pins are there, and working (although it's not so funny soldering them!)

I used the PCM2902 family chips in another project (a complete USB soundcard) and it works really fine.

[iamwhoiam]

It can also fit easily into the space of a hammond C80 case I think

[jleaman]

how much canadian for a single board ?

[greggp]

Originally posted by paologatto
I used the PCM2902 family chips in another project (a complete USB soundcard) and it works really fine.

I am very interested in learning more about your USB soundcard project. Can you point to any links that might provide more details?

Thanks!!!