Thank you.
email send 🙂
I will keep the thread informed as I think others might be interested in a "Y cable build service"...
hires version: http://jamesromeyn.com/wp-content/uploads/2013/08/IMG_4367.jpg
email send 🙂
I will keep the thread informed as I think others might be interested in a "Y cable build service"...
hires version: http://jamesromeyn.com/wp-content/uploads/2013/08/IMG_4367.jpg
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I used these, solid copper contacts. And less than £1 each. But I agree a proper Y cable solution would be ideal.
(Wago) connector blocks.
An externally hosted image should be here but it was not working when we last tested it.
(Wago) connector blocks.
Dual NC1200
Hi,
I had the opportunity to get my hand on a pair of NC1200 and here is what I did with them.
The cabinet is a modified (re inforced) Modushop Galaxy one with not much place left...
I tried to optimize the cabling and routing. Only a few centimeters for the power supplies and so on. AC filtered etc.
I designed a small module which control the auto power on, standby and mute functions.
Also, the overall consumption on idle is around 75W so cooling was a problem. I use a small step down converting module to bring the positive auxiliary voltage to 12V and found a PWM controller on internet to power the 2 Prolima 120 mm and 15 mm width fan. One fan is automatically adjusted with the temp sensor, the other one is manually adjusted with a small potentiometer.
Fan can't be heard at listening point and overall internal temp got down by at least 20°C. It run at 40-45°C with a room temp around 20°C.
For now, enjoying the sound on my three way active stereo system with active MFB sub 🙂
JC
Hi,
I had the opportunity to get my hand on a pair of NC1200 and here is what I did with them.
The cabinet is a modified (re inforced) Modushop Galaxy one with not much place left...
I tried to optimize the cabling and routing. Only a few centimeters for the power supplies and so on. AC filtered etc.
I designed a small module which control the auto power on, standby and mute functions.
Also, the overall consumption on idle is around 75W so cooling was a problem. I use a small step down converting module to bring the positive auxiliary voltage to 12V and found a PWM controller on internet to power the 2 Prolima 120 mm and 15 mm width fan. One fan is automatically adjusted with the temp sensor, the other one is manually adjusted with a small potentiometer.
Fan can't be heard at listening point and overall internal temp got down by at least 20°C. It run at 40-45°C with a room temp around 20°C.
For now, enjoying the sound on my three way active stereo system with active MFB sub 🙂
JC
Attachments
Hopefully not with a T or pi filter...
Wow! Surprised it burns so much more idle power compared to a pair of nc400's.
I use the following SCHURTER KMF1 10 ampere version
As I was ! In standby mode it's really peanuts but on idle it exceed by far what I expect from the datasheet. Anyway that's the truth and I had to move from natural convection to Fan...
Of course, having 2 x 1200W/2 Ohms in such a small cabinet is not bad at all
I assume it is the standard version, not the medical (M5) version?
The standard version has a filter topology that connects safety ground/earth to the mains poles through capacitors, providing a path for noise - something Bruno has warned about.
What power supplies are you using? Do the nc1200's have a similar facility for a gate drive supply as the nc400's (that really makes a big difference in idle power consumption)?
Indeed!
Yes, it is the standard version and what I can tell you I have no noise or interference problems at all
Recommended Hypex SMPS 1200. I think that NC400 & NC1200 have a similar topology. It's easy to download NC1200 and SMPS1200 datasheet from Hypex site.
75w idle only 2 channels, now im glad i didn´t bought them.
http://www.diyaudio.com/forums/vendors-bazaar/190434-hypex-ncore-791.html#post4317597
really interest to know how much this idles
http://www.diyaudio.com/forums/vendors-bazaar/190434-hypex-ncore-791.html#post4317597
really interest to know how much this idles
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It is nevertheless something Bruno specifically warned against. Guess your case shows that we mostly obsess about stuff that doesn't really matter 🙂
Problem is that the nc1200 is an OEM module with many options. By default it uses an on-board regulator for the buffer power (unlike the nc400), and dissipation is much higher than on an nc400, but there is an option to offload the regulation, nc400-style.
Yes, true but frankly I don't think that's the full explanation. NC1200 on board regulation don't dissipate that much. Also SMPS 1200 has more idle dissipation than expected.
Have you checked that your amps aren't oscillating, or that there isn't any HF noise causing extra power consumption?
I use this AC wattmeter for some time and results was accurate on some other stuff (namely Pascal Audio modules)
Attachments
http://www.hiit.fi/files/admin/publications/Technical_Reports/hiit-tr-2009-1.pdf
i have cheap technoline
i have cheap technoline
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