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Old 15th December 2012, 12:36 AM   #3301
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I do like those white boards. You have been busy. Hope your actually getting a chance to listen, although I know you are just mainly checking board.
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Old 15th December 2012, 12:41 AM   #3302
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Nice work Tea- Bag. As buzzforb says do take time to listen !!!
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Old 15th December 2012, 12:47 AM   #3303
lhquam is offline lhquam  United States
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I finally got all of the parts to try out IRFP240s and FQA28N15s with a new set of Teaser-6 boards.

Stay tuned to this station...
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Old 15th December 2012, 12:52 AM   #3304
Tea-Bag is offline Tea-Bag  United States
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Here is the board without FETs showing room for 2 LEDs. Here I used the red, blue - but swapped to blue , blue. Now it biases over 1v across 1R without an issue.
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File Type: jpg WithoutFets.jpg (272.1 KB, 454 views)
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Old 15th December 2012, 07:30 AM   #3305
qusp is offline qusp  Australia
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Quote:
Originally Posted by Tea-Bag View Post
I completed F6 with IRF240's.
I used 1R Source resistors. The bias only went to ~500mv with existing 5K Pot.
Assuming I go, to .5R resistor, I think this will give me enough room to bias higher. I was too scared to add pots across the source resistor. With IRF240's I am not sure if that's a good idea, assuming the overall source resistance goes below <.5R overall.
If not I was considering changing R3-4.
Any thoughts?
is that an optional to220 placement for the 0r1? this may just stop my progress building my own PCB, though I would like 2 or 3 in parallel there since i'm using r125. I have some 0r66 tx220S (older Sfoil version of the Z, but they are 4 leaded) yes I have that many waiting for a project just like this, I love DIYA for sales forums =)

though I may carry on as I want to use some SMD parts for something different (and because I have a large stock of them. a modified all Nchannel front end would be cool too with bf862, but I cant think of how to achieve that.

Last edited by qusp; 15th December 2012 at 07:51 AM.
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Old 15th December 2012, 08:17 AM   #3306
qusp is offline qusp  Australia
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Teabag do you have a part description for the onetics pinout suitable for diptrace? or just a link to the datasheet if it has this info? I have them in hand so can just measure, but I dont think I have the datasheet anywhere and its for sure not in the library hehe
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Old 15th December 2012, 09:22 AM   #3307
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Tea bag I thought you said the Onetics is in action or is it disguise as Jensen?

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Old 15th December 2012, 11:23 AM   #3308
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Qusp,the datasheet is this thread. Just searcg BudPs post. I wonder if a single dcb1 like bf862 FE would have low enough Zout for the trafo. Could always parallel.
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Old 15th December 2012, 12:20 PM   #3309
Zen Mod is offline Zen Mod  Serbia
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shoot for 50 max
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Old 15th December 2012, 12:31 PM   #3310
qusp is offline qusp  Australia
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Quote:
Originally Posted by aoc View Post
Tea bag I thought you said the Onetics is in action or is it disguise as Jensen?

Sent from my Xperia Ion using Tapatalk 2
yeah that got me too, first pic on previous page is Onetics, second is Jensen

Quote:
Originally Posted by buzzforb View Post
Qusp,the datasheet is this thread. Just searcg BudPs post. I wonder if a single dcb1 like bf862 FE would have low enough Zout for the trafo. Could always parallel.
thanks mate, will do, was going to PM him but thought i'd check here first. re BF862, apparently 4 in parallel is about as far as you can push them without adding some inductors to stop RF parasitics, but I would expect 4 parallel with a couple little copper BGA heatsinks would make a nice little FE if I can make it work

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shoot for 50 max
haha always the jester, though of course being tiny SMD, 50 in parallel could be made to fit in 5cm x 5cm double sided PCB. tempco is pretty neutral, its just the fact they are made specifically to amplify RF, so given the opportunity, thats what they do whether you like it or not.
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