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Old 27th February 2013, 02:26 AM   #2171
pdg is offline pdg  Canada
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Default one 3nf instead of 3 1nf for C2

@rjm
Hi Richard.
Is there any specific reason that you've specified 3 1nF(1000pF) in the RIAA equilization of the PC3 instead of a single 3nF cap?

thanks, Philip
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Old 27th February 2013, 04:17 AM   #2172
rjm is offline rjm  Japan
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Simply because 3 nF is not a standard part value, and its more efficient to buy lots of a single value rather than small quantities of several different parts.

/R
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Old 27th February 2013, 04:27 AM   #2173
pdg is offline pdg  Canada
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Quote:
Originally Posted by rjm View Post
Simply because 3 nF is not a standard part value, and its more efficient to buy lots of a single value rather than small quantities of several different parts.

/R
Thanks Richard. Digikey has the 3nF from the same manufacturer as you specify in your BOM with the same tolerance and lead spacing as the 1nF and I'll save myself about $10 which I can spend on possibly upgrading the coupling cap's. Philip
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Old 27th February 2013, 05:17 PM   #2174
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What is the estimated USD cost to build the VSPS dual board version?
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Old 27th February 2013, 07:08 PM   #2175
Bibio is offline Bibio  Scotland
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i'll admit from the start i know nothing about electronics.

i would like to know what would happen if you wired up 2 transformers like the picture below. this is for one mono board

Click the image to open in full size.
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Old 2nd March 2013, 08:03 PM   #2176
vulejov is offline vulejov  Serbia
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This is final version.. I hope so.. RIAA curve is very accurate..

Is there any reason for such big transformers.. it works very smooth with 1.9 VA board mount transformer..
Attached Images
File Type: png PHONO.png (22.6 KB, 111 views)
File Type: png RIAA.png (27.3 KB, 107 views)
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Old 3rd March 2013, 10:34 AM   #2177
rjm is offline rjm  Japan
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Quote:
Originally Posted by downhiller2010 View Post
What is the estimated USD cost to build the VSPS dual board version?
Total finished VSPS 300 at single quantity pricing and bom parts would be about 200 usd.
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Old 3rd March 2013, 10:36 AM   #2178
rjm is offline rjm  Japan
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Quote:
Originally Posted by Bibio View Post
i'll admit from the start i know nothing about electronics.

i would like to know what would happen if you wired up 2 transformers like the picture below.
Don't do this! Transformers cannot be connected in parallel!
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Old 3rd March 2013, 04:07 PM   #2179
troystg is offline troystg  United States
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Agreed, transformers can't but secondaries can.

If he parallels the secondaries of the transformers he doubles the current in a safe manner.
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Old 3rd March 2013, 05:17 PM   #2180
pfcs49 is offline pfcs49  United States
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Don't know a lot, but I bet you'd better get the primaries in phase to do this.
And wouldn't the primaries be in parallel to the AC voltage source??
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