So you failed to know all the Werners.
http://upload.wikimedia.org/wikipedia/commons/thumb/3/3f/Coat_of_arms_of_Westmeath.jpg/100px-Coat_of_arms_of_Westmeath.jpg
http://upload.wikimedia.org/wikipedia/commons/thumb/3/3f/Coat_of_arms_of_Westmeath.jpg/100px-Coat_of_arms_of_Westmeath.jpg
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Hesener has now " repaired " a certain amout of boards that have being send to him by desperate builders. He told me in a private conversation that he got very good and fast to track the issues because basically every time the same mistakes show up.
When you get into trouble, ask him. If it gets a total disaster he may repair the boards if time permits. I can not speak for him though. To repair 600 boards is of cause impossible.
Read the fu... manual and try to make no stuffing mistakes.
Our friend in Brunei got really mad. I said : look if you have reversed something.
He said NO: Then he found that he had reversed ALL Leds because he has mis interpretted the lettering. And so it goes...
Do not drink alcohol the day before and THINK before you put something in. Then the chance is high that it works right away. The instructions get permanently updated if we find any new bugs.
When you get into trouble, ask him. If it gets a total disaster he may repair the boards if time permits. I can not speak for him though. To repair 600 boards is of cause impossible.
Read the fu... manual and try to make no stuffing mistakes.
Our friend in Brunei got really mad. I said : look if you have reversed something.
He said NO: Then he found that he had reversed ALL Leds because he has mis interpretted the lettering. And so it goes...
Do not drink alcohol the day before and THINK before you put something in. Then the chance is high that it works right away. The instructions get permanently updated if we find any new bugs.
NJF selection for the PSU
About some more reasons for a (not to bad) (but still) noisy PSU. Salas has found that it is possible that the PSU generates 20 up to 50 mV of white noise. This level of PSU contamination is not affecting the RIAA but we want perfection.
After some discussion, between Salas and me, it was thought that the J310 may be the cause of the problem. Back to the simulator, and the datasheet then, what I find is this, the J310 is used as a CCS of 1mA, for this it needs a Rgs of (about) 3Kohm, that implies a Vgs of 3Volts. The Vgs of the HexFet is (about) 4Volts, in this application. That leave about 1Volt margin on Vds of the J310, given production tolerances and specification spread between manufacturers, this may be not enough.
In case where the Vds margin is to low, the J310 will not be a constant current source, in these cases the PSU will not function optimal, and a higher than normal noise level will be present.
Now how to solve this? Easy! Use a NJF that shows a higher margin. For instance, the 2SK170 needs a Vgs off (about, according to simulation data) 360mVolt, and that leaves a margin of 3.6Volts. That would be enough, but the 2SK170 is something like unobtainium. That is where I started my hunt for a replacement NJF. If should be cheap, leave lots of margin, and easy to get.
I went to the Mouse site and searched for NJF’s that fit the bill, from this and other data I compiled the attached graphs, left to right 0 Sec to 10 Secs is equivalent to 0 to 10 Volt on V1. All NJF’s that are at 1mA constant current in 2Volts (e.g. 2 Secs) are wanted, NJF’s that show 1mA constant current in 3Volts (e.g. 3 Secs) are considered marginal (and the J310 is there, just, borderline).
From my graphs, the best, commercially available and cheap NJF is the J113, good choices are 2SK170, BF256A, BF245A, BF244A, J113, U309 and J309. If you want to propose others, then let me know, if applicable, I will add them to the graph
(I replaced the graph, the first one posted was incomplete, sorry)
These are the most important/relevant messages regarding PSU and Pre-Reg.
About some more reasons for a (not to bad) (but still) noisy PSU. Salas has found that it is possible that the PSU generates 20 up to 50 mV of white noise. This level of PSU contamination is not affecting the RIAA but we want perfection.
After some discussion, between Salas and me, it was thought that the J310 may be the cause of the problem. Back to the simulator, and the datasheet then, what I find is this, the J310 is used as a CCS of 1mA, for this it needs a Rgs of (about) 3Kohm, that implies a Vgs of 3Volts. The Vgs of the HexFet is (about) 4Volts, in this application. That leave about 1Volt margin on Vds of the J310, given production tolerances and specification spread between manufacturers, this may be not enough.
In case where the Vds margin is to low, the J310 will not be a constant current source, in these cases the PSU will not function optimal, and a higher than normal noise level will be present.
Now how to solve this? Easy! Use a NJF that shows a higher margin. For instance, the 2SK170 needs a Vgs off (about, according to simulation data) 360mVolt, and that leaves a margin of 3.6Volts. That would be enough, but the 2SK170 is something like unobtainium. That is where I started my hunt for a replacement NJF. If should be cheap, leave lots of margin, and easy to get.
I went to the Mouse site and searched for NJF’s that fit the bill, from this and other data I compiled the attached graphs, left to right 0 Sec to 10 Secs is equivalent to 0 to 10 Volt on V1. All NJF’s that are at 1mA constant current in 2Volts (e.g. 2 Secs) are wanted, NJF’s that show 1mA constant current in 3Volts (e.g. 3 Secs) are considered marginal (and the J310 is there, just, borderline).
From my graphs, the best, commercially available and cheap NJF is the J113, good choices are 2SK170, BF256A, BF245A, BF244A, J113, U309 and J309. If you want to propose others, then let me know, if applicable, I will add them to the graph
(I replaced the graph, the first one posted was incomplete, sorry)
These are the most important/relevant messages regarding PSU and Pre-Reg.
- Mpp #4375 PSU-pre-regulator.
- Mpp #4610 V2 Schemas UPS and Amp.
- Mpp #6506 CCS fine-tuning.
- Mpp #6462 PSU with my notes.
- Mpp #6809 Do not try to feed the CVS of the CCS of the shunt with a regulated power supply.
- Mpp #7127 More about transformer selection.
- Mpp #7635 Single and dual transformer wiring (also corrected drawing) (See also #7733).
- Mpp #7733 Grounding (PSU, RIAA and Player).
- Mpp #7810 35V PSU for the CroMagnon.
- Mpp #7830 The PSU explained.
- Mpp #8386 My resistor recommendation’s.
- My Paradise #56 PSU Noise.
- PradiseBuilders #13 Schema's and assembly guide.
- PradiseBuilders #155 Vdc input voltage minimum simulated.
- PradiseBuilders #970 PSU oscillates; posible solutions?
- PradiseBuilders #983 Compensating the PSU for oscillations.
- PradiseBuilders #1173 Fixing oscillations (up to #1182).
- PradiseBuilders #1322 Fuse .
- PradiseBuilders #1387 Updated Paradise R3 assembly guide (Also German).
- PradiseBuilders #1403 Capacitors bad vs good.
- PradiseBuilders #1593 PSU Power Transistor selection.
- PradiseBuilders #1644 PSU Output Impedance.
- PradiseBuilders #1680 PSU Power Supply Suppression Ratio(PSSR).
- PradiseBuilders #1772 NJF selection for the PSU.
Attachments
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Then I say, go for those, use a 330 Ohm Rgs and it will work fine. The J113 is 15 $ct (12 EuroCent) at Mouser and will work just as nice.
That all being true, we did establish that 26 Volts on the input of the PSU sets best performance, any thing more creates heat, and heat only (e.g. not performance, non what so ever, do not destroy more environment than strictly needed for proper HiFi).
I was not aware that i destroy my environment with my proper hifi
Ohhh ye.., especially if you run it on brown-kohl. And I run on natural gas, and or coal, and or Norwegian waterfall's, and some wind mill's, and a bit of Nuclear (but I like that very much
).
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