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Old 2nd February 2013, 07:33 PM   #41
Einric is offline Einric  United States
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Default Maybe Some New Progress

Well, my replacement Mouser order is here.
They were out of the Panasonic .47Ω 3W so I had to settle for the KOA's as the replacement.
I have just finished building a 4wire measuring board for matching my .47Ω resistors, a bit of a pain in the *** but worth it.
I have matched my .47's and my 220F's, I don't know if it's really necessary but I suppose it couldn't hurt.

Now I will work on getting the Binding Posts installed.
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File Type: jpg Resistor Matching.jpg (176.5 KB, 373 views)
File Type: jpg Resistor Matcher.jpg (435.4 KB, 359 views)
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Old 7th February 2013, 02:21 AM   #42
Einric is offline Einric  United States
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Default Boards Finished

I have both boards completed, It was a bit of a pain to get the old fake J-Fets out of there but the new ones from Spencer are in now.
I ordered a few TO-92 heatsinks with my last Mouser order, I don't know if they will help any but they probably can't hurt.
I also bypassed the 220F FM's with some 10nF 1837 MKP's, also figured it couldn't hurt.

Now will be a bit of a wait before I will have the P/S done so I will be focusing on the chassis in the mean time.
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Old 7th February 2013, 02:29 AM   #43
Einric is offline Einric  United States
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Default Question: Silicon Rubber Coated Polyamide Film

I ordered 12 of these TO-247 Silicon Rubber Coated Polyamide Film pads for my output MOSFET's.
Do I need to use thermal grease with this stuff ur just use it as is?

Thanks
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Old 7th February 2013, 08:52 AM   #44
Zen Mod is offline Zen Mod  Serbia
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Old 7th February 2013, 12:07 PM   #45
Einric is offline Einric  United States
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Would it be ok if 2 of my output FET's per channel were hooked up with wires instead of soldered through the holes?
Or should I just hook them all up with wires in that case?
There is some mounting hardware on my heatsinks that is in the way of the inner two FET's.
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Old 10th March 2013, 03:53 AM   #46
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Hi Einric

How's it going ?

Thick cable on the trannys...is extra heatsinking !!!

Cheers

Si.

Close...but NO cigar !
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Old 11th March 2013, 12:39 AM   #47
Einric is offline Einric  United States
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Things are going pretty well.
My F4 is on hold for now until funding for the P/S frees up.
I understand the AnTek facility caught fire so I will be waiting a bit until their production comes back.
After the P/S is completed I will be able to complete this build.
I am still planning on P2P wiring on the P/S, there is no sense using a PCB for a couple of rectifiers and caps.
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Old 11th March 2013, 02:50 AM   #48
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Sounds like AnTek might have had a loose wire !

Nice one Einric...
...all ahead s l o w is the Space Egg way !

Cheers.

Si.
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Old 11th March 2013, 03:25 AM   #49
6L6 is offline 6L6  United States
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Quote:
Originally Posted by Einric View Post
I am still planning on P2P wiring on the P/S, there is no sense using a PCB for a couple of rectifiers and caps.
If you have a good way of mounting it all, then I agree. If not, then a PCB is a good way to mount everything.
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Old 11th March 2013, 03:58 AM   #50
Einric is offline Einric  United States
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Caps will Hot Glue upside down with resistors bridging them, the rectifiers will be mounted to the chassis bottom.
That should keep it clean and allow for "flexible" placement if need be.
I will build the P/S to look just as it shows on the F4 users manual.

I'm debating on the 200VA or 300VA toroid though.
Antek has the AS-3218 in stock right now for $41 but the AS-2218 is out of stock @$32.

Last edited by Einric; 11th March 2013 at 04:00 AM.
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