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Old 8th September 2010, 01:53 PM   #4741
Salas is online now Salas  Greece
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Quote:
Originally Posted by AndrewT View Post

There is a big difference between to and too in english. Is that the problem you are having?
I have no problem with to & too. I am explaining why the 180R in this case and other options given the opportunity.
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Old 8th September 2010, 01:58 PM   #4742
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It won't be wise to run that ccs fet at full idss because it sees a high potential across and it will dissipate much.
then why the necessity to post this immediately after my post that refers to jFET+R17?
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Old 8th September 2010, 02:02 PM   #4743
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Because that's when I logged in and saw the posts.
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Old 8th September 2010, 02:10 PM   #4744
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posts 4735 and 4737 are the two relevant posts between your posts.

Why did you make that comment?
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Old 8th September 2010, 02:15 PM   #4745
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Again. To explain the 180R choice or other options given the opportunity it was discussed.
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Old 8th September 2010, 02:18 PM   #4746
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Hey guys, I'm not confort with discussions I only want help so:

between B+ & njfet 3k3 1W or 180R?

Peace
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Old 8th September 2010, 02:23 PM   #4747
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You can either use the 180R as it is and run the leds lower current, or delete it and put a 3k3 1W between B+ and the Led's Jfet to run them higher current. In any case you should test and match them with the jfet of choice feeding them with an 180R or without (fet g&s) if you are to use the 3k3. I would choose the configuration that takes me nearer to the voltage I seek with the particular leds. You use the trimmed down Idss already in your current build.
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Old 8th September 2010, 03:08 PM   #4748
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For balanced I want to use this schematic gain 60dBs:

Click the image to open in full size.

How many volts will have to measure the LEDs string?

Of course 4 channels.

Last edited by merlin el mago; 8th September 2010 at 03:13 PM.
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Old 8th September 2010, 03:17 PM   #4749
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Quote:
Originally Posted by Salas View Post
You can either use the 180R as it is and run the leds lower current, or delete it and put a 3k3 1W between B+ and the Led's Jfet to run them higher current.
Quote:
Originally Posted by merlin el mago View Post
For balanced I want to use this schematic gain 60dBs:

Click the image to open in full size.

How many volts
Merlin,
you have ignored Salas' advice and deleted R17 without doing anything else.
Why bother asking questions when you don't implement the recommendations?

What voltage, I cannot read your tiny sketch.
Crop it and repost at a sensible/legible size.
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Old 8th September 2010, 03:42 PM   #4750
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Quote:
Originally Posted by AndrewT View Post
Merlin,
you have ignored Salas' advice and deleted R17 without doing anything else.
Why bother asking questions when you don't implement the recommendations?

What voltage, I cannot read your tiny sketch.
Crop it and repost at a sensible/legible size.
You don't understand nothing, I'm not implemented nothing, just starting to measure the voltage LEDs string to matched them for 4 channels balanced NJFET RIAA using the last posted schematic.

First to do a bad answer read all posts & you can know that I asked to measure with mine bench psu because I don't have any 9V battery to match the leds, after I asked the current needed to fix mine bench & later I posted the schematic I want to use & I asked how many volts must measure the LEDs string in mine schematic?
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