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Old 10th July 2013, 07:03 PM   #311
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I just finished dry fitting the parts.

Click the image to open in full size.

It seems that R13 and R14 are 0.5R caddocks (for IRFs), R2 is a 20R Caddock, a 9.1V zener for the led reference.

Are these correct? Also, what is the polarity mark on the Jensens? Or should I just align the letters and then the dot on the boards?
I m also a bit concerned about the zener polarity. Do they look ok?

Also about the FE, with 10mA jfets, I guess we only populate Q3A qnd Q4A right?

I also do not have an R1. Justin did you forget that one or it would not be included in the GB?

Thanks again for a nice package.
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Old 10th July 2013, 07:20 PM   #312
bk856er is offline bk856er  United States
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Is your Q4A inserted correctly??

BK
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Old 10th July 2013, 07:22 PM   #313
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Quote:
Originally Posted by bk856er View Post
Is your Q4A inserted correctly??

BK
Good catch

THANKS A LOT!!
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Old 10th July 2013, 08:06 PM   #314
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Everything is correct exept for Jfet. the pinout on the Jensen will help locate it properly. Pin 1 is the only one with a smaller offset. You should have two R1's.
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Old 10th July 2013, 10:34 PM   #315
bk856er is offline bk856er  United States
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Also see post #41 for link to Jensen pdf, and post #144 for a nice pic of proper daughter card orientation.

Some good info in Tea's F6 blog about FE considerations. My understanding is you're good to go with one pair 10mA jfet and R11/R12 as supplied by buzz.

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Old 10th July 2013, 10:39 PM   #316
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Justin's mention of the offset makes perfect sense.
Basically you cannot solder the Jensen on the daughterboard in a wrong way unless you force it and bend the pins significantly.

You just have to be careful to follow the dots on the boards to attach the daughterboard
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Old 27th July 2013, 07:31 AM   #317
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Hi all
got the parts thanks Buzz!!
few questions
I,m building the f6 buffered using the original schematic on the firstwatt site
and I need to clarify a few things

1, the f6 buffered schematic above does not have r11/12 I suspect these are for jft degeneration ,do I use them ? if so what goes there (I have 4 x 10r left from buzz,s kit after populating everything as per the above schematic )

2, what way do the led install ,one of the solder pads is square the other is round(teas boards)

3, what are the diodes for in the kit ,the f6 buffered schematic does not show any

4, do I have to install p3 /p4, I just want to build as per nelsons original circuit which does not use these

rgds Sheafer
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Old 27th July 2013, 11:21 AM   #318
Ryssen is offline Ryssen  Sweden
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Quote:
It seems that R13 and R14 are 0.5R caddocks (for IRFs), R2 is a 20R Caddock, a 9.1V zener for the led reference.
Could you take a closer pic of those zeners,couse I got a resistor there instead,or maybee that will work as well?
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Old 27th July 2013, 11:30 AM   #319
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The Zener's were included for those folks who would be using the IRF outputs. It give you a larger voltage to divide down with the pot for the gate of the mosfet.
The Led's have one long leg. That leg is the anode of the LED.
You will have to post the schematic you are talking about for me to know how to advise. There were several put out in the article
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Old 27th July 2013, 12:15 PM   #320
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HI Buzz
I just noticed the 'f6 variable 2nd' schematic which matches the board and parts so I guess that is what I will put together
re the zeners , im using r100 semis so does that mean im just to install both led,s ?

Sheafer
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