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Old 9th January 2009, 05:03 PM   #101
rhysh is offline rhysh  United Kingdom
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Im going to order about 10 boards. I suspect them to be about $10 each. Anyone intrested?
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Old 9th January 2009, 05:33 PM   #102
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Sounds good
I am interested.
One board is Stereo?
You mentioned modifications earlier, which?

Regards
Michiel
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Old 9th January 2009, 05:34 PM   #103
rhysh is offline rhysh  United Kingdom
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One board per channel, you need two boards for stereo. I was just going to order the standard boards if other people are intrested.
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Old 9th January 2009, 11:48 PM   #104
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$10 per board is half of what Olimex would charge, are you sure you are quoting for a double sided PCB?

There is no "standard" Phonoclone board: variants include the RC, the BE, and the 3. The clearest way to refer to exactly which revision you are talking about is to state the filename of the Eagle files: pc28c, pc23k, and pc31j respectively.

/Richard
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Old 10th January 2009, 02:48 AM   #105
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I would be interested in two boards (stereo)!
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Old 10th January 2009, 08:49 AM   #106
rhysh is offline rhysh  United Kingdom
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Quote:
Originally posted by rjm
$10 per board is half of what Olimex would charge, are you sure you are quoting for a double sided PCB?

There is no "standard" Phonoclone board: variants include the RC, the BE, and the 3. The clearest way to refer to exactly which revision you are talking about is to state the filename of the Eagle files: pc28c, pc23k, and pc31j respectively.

/Richard
I will be ordering the pc31j boards. Yes, i am quoting for a double sided pcb, i pay $109 for 155sq inch.
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Old 11th January 2009, 12:03 AM   #107
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So the phonoclone 3 lives!!


I stuffed the boards and fired it up tonight. All went uneventfully thank god! Basically its done as per RJMs recommendation. I used 3nF and 768K/110K for the RIAA. R1 is set at 10R which suits my cart and I set R2 at 330R, just at the limit of the 30x of R1. It powered up and apart from the tiniest click when I hit the power switch, you would never know it was on. Absolutely quiet, no hum hiss etc etc.

I am aware that I am using a fairly low value for R2 - and hence low gain. So maybe with higher gain something might happen. If I get a chance I'll stick in a 1K or something for R2 and see do I hear anything. I did orignally have a bit of hum with the previous phonoclone until I brought R2 down to c. 500R so it will be interesting to see how this one does.

I left out C12 and 13 and I used a big wima 4.7 MPK4 for C3. To be honest I am not 100% happy with that choice. I think I'm gonna search for some blackgate Nx4.7 - and I'm nearly certain I have a pair in the VSPS which I don't use anymore. If I can't find any, thats where I'll get some.

Sonics wise - I can see what RJM is talking about (extra detail), but on inital power up it seems a little hard, or maybe etched. After an hour of listening this did ease out a bit, so maybe on extended burn in that will go. It took 3 weeks for the other phonoclones to settle down so it would be unfair to judge this one yet. I'll give it a little time and see how it fares out.

Fran..... off to hunt for some Nx - wish me luck!
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Old 11th January 2009, 12:17 AM   #108
rjm is offline rjm  Japan
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Glad to hear that it went smoothly.

Your impressions certainly match mine.

Have you added the resistors R21,22 yet? Though burn-in also seems to be more important than normal, adding those resistors worked for me to calm things down.
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Old 11th January 2009, 12:21 AM   #109
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Yeah - they're the 47R on the reverse side, right? Added those, but didn't add C0 yet.

The BG Nx seem to be really gone forever. I really hope that I used a pair in that VSPS!

I also have some GE film caps that I used recently in the output of a DAC and I think they might be ok too - certainly worth a try.


Will have another look at this tomorrow.

Fran
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Old 11th January 2009, 12:51 AM   #110
rjm is offline rjm  Japan
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Yes, cut the trace and solder the resistors across the pins.

Well, we're both listening to the same circuit then.

Give it a couple of days powered up and see how it shakes down.

Pics?

/Richard
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