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Old 22nd September 2013, 11:03 AM   #101
acumos is offline acumos  Italy
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I'm worried about the thermistor epcos because it's not marked cl-60 but it's 10ohm and 5a
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Old 22nd September 2013, 11:05 AM   #102
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Originally Posted by acumos View Post
I'm worried about the thermistor epcos because it's not marked cl-60 but it's 10ohm and 5a
You should first try to source the CL-60, it's pretty much available online.
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Old 22nd September 2013, 11:54 AM   #103
AndrewT is offline AndrewT  Scotland
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the important line in the short form spec is
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AC Line Rated Class X1/Y2 Capacitors
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Old 22nd September 2013, 11:56 AM   #104
AndrewT is offline AndrewT  Scotland
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I'm worried about the thermistor epcos because it's not marked cl-60 but it's 10ohm and 5a
You also need the correct joules to ensure you don't blow it up.
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Old 5th October 2013, 01:33 PM   #105
Corpius is offline Corpius  Netherlands
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Should I tie the grounds of both the positive and negative rail together for my F5? Looks like Nelson Pass did that on his power supply board: 6moons audio reviews: FirstWatt F5
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Last edited by Corpius; 5th October 2013 at 01:53 PM. Reason: typo
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Old 5th October 2013, 01:42 PM   #106
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Yes you could do that as in the original F5 or you can tie the grounds on your star ground point too. Whichever one to do is left to your decision of course.
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Old 5th October 2013, 01:55 PM   #107
Corpius is offline Corpius  Netherlands
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thanks. As done in the original F5 is the easiest way, so that will do
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Old 5th October 2013, 01:57 PM   #108
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Indeed it is. Good luck and happy amp building.

Cheers
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Old 5th October 2013, 04:21 PM   #109
jdg123 is offline jdg123  United States
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star ground question: Is the concept to bring every ground from every board (even the single ended RCA input too?) to a single slab of copper?

I have some 1/8" x 3/8" bar stock that would do if this is the case...

P.S. I know the chassis gets a single ground at or near the IEC connector.
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Old 5th October 2013, 04:53 PM   #110
roger57 is offline roger57  Canada
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Quote:
Originally Posted by jdg123 View Post
star ground question: Is the concept to bring every ground from every board (even the single ended RCA input too?) to a single slab of copper?

I have some 1/8" x 3/8" bar stock that would do if this is the case...

P.S. I know the chassis gets a single ground at or near the IEC connector.
Here's a picture of my DAC employing a single point ground using a #8 bolt with soldered ring tabs. Every PCB (or item) that requires a GND is returned to this point. Ideally, all grounds should be the same length as the purists will tell you. Have used this method in every piece of equipment I have made and I can tell you it's the best way to implement it. I cannot emphasize the importance of ensuring AC Line and Neutral connections are kept consistent and correct from transformers in each piece of equipment and between components to ensure the quality and safety of this approach.
BTW - the term "star ground" is typically used when describing PCB ground methods. When wiring a chassis, the ground point can be at any location as long as the "star points" (the wires) are reasonably close in length.
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