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Old 15th December 2012, 01:23 PM   #3311
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Ihave gotten hooked on the smd thing as well. Salas RIAA will be made with Vishay TNPW. Too bad they dont make good polysterene caps in SMD. What would be compact board is made large by caps.
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Old 15th December 2012, 01:41 PM   #3312
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who's Jester ?

I was speaking about buffer out impedance

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Old 15th December 2012, 01:41 PM   #3313
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Originally Posted by lhquam View Post
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...
As always, I am all ears, and looking forward to your results.
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Old 15th December 2012, 01:46 PM   #3314
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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.
It is gorgeous. I am looking forward to your results.
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Old 15th December 2012, 01:48 PM   #3315
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Jester ?

Who is clever enough with words to have two possibilities.
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Old 15th December 2012, 01:52 PM   #3316
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Quote:
Originally Posted by Zen Mod View Post
who's Jester ?

I was speaking about buffer out impedance


haha sorry, I thought you were making reference to a certain parallel jfet beast, so thought you were joking about 50x bf862 in parallel for acceptable buffer

let me rephrase my post then:

thanks for the tip!
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Old 15th December 2012, 01:56 PM   #3317
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not bad idea for 50++



but - can ya imagine Babelfish Beast with 1000(++) Jfets ?

it will certainly have several LED's , few BF245's , and few IRFP's as cascodes .......

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Old 15th December 2012, 01:57 PM   #3318
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Originally Posted by buzzforb View Post
Ihave gotten hooked on the smd thing as well. Salas RIAA will be made with Vishay TNPW. Too bad they dont make good polysterene caps in SMD. What would be compact board is made large by caps.
i'm sure they do, but they are sure hard to find, probably you would need to get enough people together to get OEM. you can get SMD teflon as well. both of these find their home in high grade RF.

but you are correct, its usually these large film caps that ruin a compact design, however with some planning you can arrange it so that a large cap like that sits directly over a bunch of other components on the PCB, so it doesnt take up any more real-estate, only height

indeed SMD is addictive once you get the taste for it, particularly since there are so many new and quite interesting discrete parts, easier for DIY PCB manufacture, easier rework blah blah, i've said it all before.
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Old 15th December 2012, 02:13 PM   #3319
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You cannot argue with the performance specs of the resistors, that is for sure. Got Toshiba jfets in the RIAA, so it makes hovering caps difficult. I was surprised to find that i could not find an SMD cap that could beat Pana FM, spec wise. None of this takes ito consideration sound of components, but lets not go there or we will all be hating each other by the end of the day Translation to power amps is difficult because with CLass A, you just need space.
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Old 15th December 2012, 02:31 PM   #3320
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nosiree, the resistors are outstanding! as an aside, so are the new range of thin film caps (for the very low values up to 22pf, Cdom etc) thats mainly what I will be using, low wattage resistors, BF jfets if I can and probably the LEDs will be SMD. i'm not looking to make the whole thing SMD on this thing, just mixed, its a chunky power amp with manly power jfets, i'm just looking to have a bit of fun with parts I have on-hand. for the low wattage resistors, LEDs and jfets I actually dont think there is a better choice anyway. maybe i'll find some whacky shielded RF board mount SMD connector for the input as well.

the main reason I want to do a PCB is to use up those tx220S 4 lead resistors (I literally have a small punnet full of them on 4 lead 0r66, 4 lead 4R and 2 lead 10R that I got for exactly this type of occasion), which are near useless as far as power ratings are concerned (less than 1W) unless you have them heatsinked (12W), so I need a bit of a unique layout for that section to allow 2-3 in parallel but heatsinked.

^^ before anyone says, I know some are thinking it, i'm aware I could make light work of that aspect with p2p and some thick copper wire, but thats not the point =)

whats the problem with the caps you are finding, leakage currents?

sound of components? I dont know what you mean? =)

Last edited by qusp; 15th December 2012 at 02:42 PM.
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