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Old 27th August 2010, 12:18 PM   #141
Salas is offline Salas  Greece
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Quote:
Originally Posted by merlin2069er View Post
Is it ok to use LSK170A and mix them up with some of the 2sk170BL's for my 2nd unmatched board ?

Thanks,
JG
LSK170A is lower IDSS like 2SK170GR. If you got IDSS matches for the 4 audio JFETs between 2SK & LSK they are compatible though.
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Old 27th August 2010, 12:33 PM   #142
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Quote:
Originally Posted by merlin2069er View Post
Hmm,

where do the matched set of 2sk170's go on the pcb board?

Thanks,
JG
You will see 4 in a row,

that is where I placed the "Matched" set of 170's

on my Blue Board.

I just guessed I may be wrong,

I ask the same question and receive the same useless

answer as you just received to look at post 4,

Looking at post 4 is the same as looking at the board in your hand.
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Old 27th August 2010, 12:42 PM   #143
Salas is offline Salas  Greece
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There is an example link in post 4 showing the audio Jfets positions and how to arrange the slightly less in IDSS from each pair, reserved for the two inner positions. The guy who gave the answer was useful. Look better.
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Old 27th August 2010, 12:47 PM   #144
AndrewT is offline AndrewT  Scotland
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Old 27th August 2010, 01:42 PM   #145
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Right, the matched 2sk170s are in the buffer section of the board. Makes sense.
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Old 27th August 2010, 07:12 PM   #146
qusp is offline qusp  Australia
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Quote:
Originally Posted by ppcblaster View Post
........

I ask the same question and receive the same useless

answer as you just received to look at post 4,

Looking at post 4 is the same as looking at the board in your hand.
wow, I caught that in a glance before I even had the boards. way to ingratiate yourself to those who might help you if something goes wrong
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Old 27th August 2010, 07:26 PM   #147
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For what its worth, I think these boards are very well designed and Salas, Tea-Bag and others have been VERY helpful and open with their time. The boards are also dirt cheap, imho compared to what you would have to spend on a retail product.

The picture of the schematic, board and solder screen with grounding layout is very useful. The BOM on the 1st page of this thread complements the board perfectly with little doubt, imho. If there are doubts, then post a question, but be nice about it. Insulting the original designer(s) gets you nowhere.

Anand.
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Old 27th August 2010, 08:07 PM   #148
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by ppcblaster View Post
You will see 4 in a row,

that is where I placed the "Matched" set of 170's

on my Blue Board.

I just guessed I may be wrong,

I ask the same question and receive the same useless

answer as you just received to look at post 4,

Looking at post 4 is the same as looking at the board in your hand.

We are here to learn ...i think, you owe it to yourself to read the thread, especially post 77, then thank Salas et all and be happy you got a whole lot for nothing....and by the way post 4 has an Example which profusely explains things....look closer...find the link....

Last edited by CeeVee; 27th August 2010 at 08:12 PM.
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Old 27th August 2010, 08:59 PM   #149
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Quote:
Originally Posted by LucasAdamson View Post
When measuring, they took some time to stabilise, and even then I am not convinced that they did stabilise fully - they measured slightly differently the next day. Normal? I don't know. They're Panasonic, but it seems they make some slightly crap stuff too.
Set up your test bench. Put one diode on it. Wait a pair of minutes for it to stabilizy. Take a look at the DMM. Slightly heat it with a lighter for a short time, like half a second. Take a look at the DMM again. Surprise!
Maybe not a voltage reference as stable as we though

The same happens to the 2SK170 when testing them.And they don't need to bee too closely matched, only to have a close idss. How much, I don't know.

DMM may have a thermal variance as well. I don't know too much about the inside part of a DMM, but I suppose that they (at least the good ones) must have any kind of stibilizer for that. Otherwise we wouldn't trust them in such a godly way.

ppcblaster, yours is the first board of the final blue production that I've seen with all the components

P2p wiring is very fun, like some kind of hability and cleverness game. Definitly much more fun than stuffing a board with the marked components in the marked places
In my last gainclone finished, everyting is made point to point except the psu. Since it is regulated, it doesn't need big capacitors. Just get a higher supply voltage and drop enough on the regulators to not suffer any voltage dropping in the output while high peaks.
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Last edited by regiregi22; 27th August 2010 at 09:01 PM.
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Old 27th August 2010, 10:08 PM   #150
TerryC is offline TerryC  United States
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Quote:
Originally Posted by regiregi22 View Post
Set up your test bench. Put one diode on it. Wait a pair of minutes for it to stabilizy. Take a look at the DMM. Slightly heat it with a lighter for a short time, like half a second. Take a look at the DMM again. Surprise!
Maybe not a voltage reference as stable as we though
Exceeding the operating temperature range by heating with a lighter doesn't seem like a reasonable test of stability.
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