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Old 18th January 2011, 04:49 PM   #11
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Estimated source resistance and load resistor. Do those probe values at the load resistor look realistic? This is approximately 8 seconds in.
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Old 18th January 2011, 05:15 PM   #12
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Estimated source resistance and load resistor. Do those probe values at the load resistor look realistic? This is approximately 8 seconds in.

The 383uV ripple looks a little high to me given you only have a 3mA load.

I don't use LC filters so I cannot comment on the design details but I would have thought C2 at 0.1uF was rather low. Try it at 100uF and see what you get.

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Ian
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Old 20th January 2011, 02:05 AM   #13
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Much better! Although I don't know if I can find a 470uF cap that will fit in my 2U chassis, I will go as large as I can. Can you see any improvements? I am planning on having a voltage divider on the output so I can dial in a good B+ voltage.
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Old 20th January 2011, 02:59 AM   #14
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Sorry; this is hard to read. I'm trying to find the voltage ratings of caps that I need. I want PCB mountable radial caps. The probes read 352V at steady state. I can get 400V caps. Is this safe to assume? I can dish out a bit more money, but sacrifice some space. My transformer is rated at 250VAC, but this is RMS and it isn't loaded.

Thank you, have a good day.
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Old 20th January 2011, 11:22 AM   #15
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Sorry; this is hard to read. I'm trying to find the voltage ratings of caps that I need. I want PCB mountable radial caps. The probes read 352V at steady state. I can get 400V caps. Is this safe to assume?
I use 400V caps for this kind of supply all the time but I also sometimes use 450V types. Both are commonly used in SMPSUs and are readily available at reasonable prices.

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Ian
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Old 22nd January 2011, 09:18 PM   #16
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Thanks Ian. How do you feel about this layout? I haven't done the AC input and B+ output pads yet.

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Old 23rd January 2011, 12:17 AM   #17
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I have done a similar layout for an RC only power HT power supply. I have all the cap -ve pins in the middle so you can run a nice short fat 0V trace up the middle, but other than that it is pretty similar.

Cheers

Ian
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Old 23rd January 2011, 12:26 AM   #18
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Thanks Ian. How do you feel about this layout? I haven't done the AC input and B+ output pads yet.
Fatter tracks please !

A groundplane wouldnt go amiss, fill in with as much copper as possible.
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Old 23rd January 2011, 01:36 AM   #19
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Thank you guys. I will run the copper all the way to the boarders of the board.
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Old 23rd January 2011, 02:17 AM   #20
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Should I worry about having channels too narrow? My grid is 50mils, so the closest points are about 30mils apart. Is that a problem?

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