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Old 4th April 2014, 11:46 AM   #631
cviller is offline cviller  Canada
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Quote:
Originally Posted by Erlend Sæterdal View Post
Hi does anybody know where to buy pcb for 16 x 10000 uf 50 V 30 mm Ø ? Just bought 32 ROE 105 celcius from Vilnius .
I have made this layout to another project, but you get the gerber and send to seeedstudio if you like. Board is 150x200 mm and snap-ins are 35 mm Ø. I have made it single sided because I plan on etching it myself when I get around to it.
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Old 4th April 2014, 11:51 AM   #632
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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F5 Turbo is posted
Quote:
Originally Posted by cviller View Post
I have made this layout to another project, but you get the gerber and send to seeedstudio if you like. Board is 150x200 mm and snap-ins are 35 mm Ø. I have made it single sided because I plan on etching it myself when I get around to it.
Thanks I can etch it it to. I have all what I need. Some years since i used it .
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Old 4th April 2014, 11:57 AM   #633
AndrewT is offline AndrewT  Scotland
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How big are the loop areas?
Have you taken any steps to reduce emi?
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Old 4th April 2014, 12:19 PM   #634
cviller is offline cviller  Canada
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Quote:
Originally Posted by AndrewT View Post
How big are the loop areas?
Have you taken any steps to reduce emi?
Feel free to elaborate about your concern. The layout is very simple - basically just 5 cobber bars like it is often done with screw mount capacitors (see e.g. Pass Labs' larger models).
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Old 5th April 2014, 09:25 AM   #635
AndrewT is offline AndrewT  Scotland
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The loop area in between the flow and return traces will emit interference.
If you have a two layer board you can superimpose the flow and return one above the other.
A single layer board should keep the flow and return traces close together.
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Old 6th April 2014, 10:51 AM   #636
cviller is offline cviller  Canada
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So basically, identical challenges as seen in p2p mounting.

I'm more concerned about the fields from the transformers and I am also considering using four 2mH air-coils for CLC. It is difficult to find a way to place them without having magnetic fields all over the place.
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Old 13th January 2016, 11:05 AM   #637
2 picoDumbs is online now 2 picoDumbs  Australia
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Quote:
Originally Posted by lhquam View Post
I am making live measurements of a balanced 1/2 Turbo. By 1/2 Turbo I mean it has one MOSFET per rail and one MUR1510 diode per FET. Here is an image of the board and is attachment to 1/2 of a HeatsinkUSA 10.08" x 7" heatsink:
Did you come to any personal conclusion?

My observations were if using a diode in parallel with a resistor the sweet spot was 3 to 4 times the current through the diode with respect to the resistor. When biased at 1.3A
eg 1A through diode and 300mA through resistor. This combo gave better distortion figures at virtually all power levels not just at high power.

In the end it was a bit of messing around to get the right resistance value to meet this 4 to 1 ratio so I just did away with the resistor and biased the circuit up using just a diode at the source of the mosfet.

I still haven't had a chance to properly compare the thing to my other amps. Bloody slow

I should get to it soon though.
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