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Old 1st June 2009, 10:32 PM   #1211
Thzar is offline Thzar  Sweden
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Subject VSPS

Rjm:

What about cutting down the resistance in the feedback, 732K

I saw some numbers that 700K have 10uV noise (10khz in roomtemp. ) add the gain 40db and you got 1000uV noise on the output only due to the feedbackresistor.

correct me if Im wrong.

Can I hear 1000uV noise??

Cutting down the resistans by 10 you got to increase the C with 10, question is how much money you will spend on expensive polystyrene caps or by some cheap polyester
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Old 2nd June 2009, 01:11 AM   #1212
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Richard Murdey
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Your question is: does R5 make a significant contribution to the output noise of the VSPS? The answer is no, it does not.

I'll leave it as an exercise for you to do the noise analysis that proves this, however.
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Old 26th June 2009, 12:11 AM   #1213
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Richard Murdey
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I've joined Twitter, I figured it would be a nice way to communicate with the VSPS and Phonoclone community. I can let people know about group buys, updates and corrections, as well have discussions about what to do next.

I admit I have no idea if this will be worthwhile or not, but I thought it would be worth giving it a try.

My Twitter name is @rjmaudio.


On a related technological front, does anyone know how I can set up my web page so that when people type in and "www.phonoclone.com" URL they get forwarded to the "phonoclone.com" domain instead? Right now both work fine, but it's confusing in Google because everything comes out twice, or at least I've got half of one and half of the other listed on the search engine.

/R
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Old 27th June 2009, 12:49 PM   #1214
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Richard Murdey
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I have ordered a big batch of VSPS stereo boards, black, double sided, 70 um traces.

No the quesion is do I offer these as boards only or as a kit. Given that the stereo VSPS is the "netry-leve" project, I get the feeling most people would prefer to buy it as a kit rather than source their own parts. I will be looking into it over the next week or so.

Q: how much would you be willing to pay for a "nice" kit?

Richard
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Old 27th June 2009, 06:41 PM   #1215
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Richard,

I'd look at the hagerman kits as a good example for pricing.

bugle (no power supply)

.d.
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Old 28th June 2009, 04:11 PM   #1216
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Richard Murdey
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The VSPS kit will be for the board and the parts that go on it, no power supply no mounting hardware. The principle will be "bang for the buck"...

Tentative parts list, for your perusal:

The board, 47b, double sided 70um trace.
NE5532 with socket (upgrade later as you like)
Wima FKP2 1nF (Mica costs a 10x more, buy yourself if you want.)
Bennic 2.2uF for C3? (not available from Mouser)
LM7812CT, LM7912CT
Nichicon FW 1000uF, 100uF
Vishay resistors for R1,2,3,4
Xicon for R5,6 (105K,732K)
Kamaya carbon comp for R7

With this build level, we are looking at an estimated kit price of ~$39, including shipping.
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Old 29th June 2009, 02:27 AM   #1217
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Richard Murdey
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Mouser-format BOM, you can import it directly into your Mouser account to get price and ordering info.

71-CMF5547K000FHEK|2
71-CMF55681R00FHEK|2
71-CMF552K2100FHEK|2
271-105K-RC|2
271-732K-RC|2
791-RC1/4-470JB|2
71-CMF5590K900FHEK|2
505-FKP21000/100/2.5|8
75-V730P205X9250|2
647-UFW1E102MPD|2
647-UFW1E101MED|2
595-NE5532P|1
512-LM7812CT|1
512-LM7912CT|1
575-11043308|1
553-VPT24-1040|1
625-GBPC102-E4|2

It's so easy it makes you wonder if there is any point selling a kit. You can take this BOM, edit it as you like, and just order the parts you want.

I'd really like to hear some opinions first before proceeding, that's for sure.
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Old 29th June 2009, 07:21 AM   #1218
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Quote:
I'd really like to hear some opinions first before proceeding, that's for sure.

Hi,

maybe I am for you a good test case even if not directly interested in the VSPS kit you are proposing.
I am newbie, however I succesfully built the simple VSPS kit of skycoral and I enjoyed it very much. I bought some months ago a DL-103 cartridge and I am waiting for the Phonoclone Rhys kit and boards.

Since time is going on and the kit is still not on the way, I am looking for the possibility of sourcing myself all components, based on your detailed information.
But for me it is not easy, I am getting confused, I have difficulty to find at the same source all components, the correct resistor value and so on. Most are stupid problems I would be ashamed to ask for information on the forum (for instance, when I look for the sockets of the IC I get hundreds of proposal and I am not able to understand what is the correct one).

Your complete mouser bom list is really a gift for people like me.

Anyway, I would like a kit, even if I have to pay a little bit more.

I also think that many of us would also enjoy a kit with top quality components

Renato
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Old 29th June 2009, 08:36 AM   #1219
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Thanks very much.

For the record, the dozens of DIP sockets confuse the heck out of me too.

I've given the matter some thought and I think I can leverage the volumes such that I can protect my initial investment and still offer the kit at a price less than it would cost people to source the parts individually. In fact I've just gone ahead and ordered all the parts.

There will be precisely 100 kits. This stock should last a long time, and hopefully bring some model-T like standardization to the project. There will be an instruction sheet included.

People will still need to buy the transformer and diodes, connectors, casing and mounting hardware.

Price for the PCB+parts+shipping will be $35. I plan to have these complete and ready to ship by mid-July.

Contents: Vishay metal film resistors R1-R3, Xicon metal film resistors at 105k,732k for R4,5. Kamaya carbon comp for R6,7. Wima FKP capacitors for C1,2, polypro film for C3, Nichicon KW for the filter and bypass, National Semiconductor LM7812CT/LM7912CT, socketed TI NE5532P.

Richard
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Old 7th July 2009, 01:59 AM   #1220
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Consolidated Mouser BOM for VSPS and Phonoclone projects.
Attached Files
File Type: zip rjm audio bom 1.0.zip (22.0 KB, 68 views)
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