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Old 15th April 2013, 05:44 PM   #5851
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http://www.fairchildsemi.com/ds/MM/MMBFJ113.pdf

at which table do I have to look to find needed Ugs for Id 2ma , cause sincerely I am looking for a while at the datasheet and didn`t manage to figure it out
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Old 15th April 2013, 06:53 PM   #5852
Salas is offline Salas  Greece
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Transfer characteristics chart. But its typical when samples vary. You just grab 2 Jfets, you put them on a bread board, you connect a trimmer from S to GND. Then you short the gate to GND. You provide 9V from a battery or more up to what it will be in the particular settings in the reg and you trim to a value for 1.5mA running in our use. You can find out by voltage drop over the VR. Or by hooking a mA meter mode DMM in series. Then you use the VR values for selecting nearer standard resistors to install. Battery (-) stands for GND. (+) goes to D pin.
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Old 15th April 2013, 07:43 PM   #5853
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a little bit over hand...
I already have two breadboard sslv v1( powering my actual breadboard pcm1794) and in each one I have 3 pieces of 2sk170, I think I will put out those, with these I can use same 82R resistor?

I saw that Kon uses on his last versions of the reflektor low value mica on the zobel
I plan to power two pcm1794`s(2x 3.3v , 2x 5v) and one amanero card(3.3v), so in total I would have to do 5ps`s
what values do you recommend for the zobel?
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Old 15th April 2013, 08:08 PM   #5854
Salas is offline Salas  Greece
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Those in the 1.1 are K117GR normally. If you breadboarded with K170BL use them with 220R or bigger in the Reflektor. Use 1R and 100n down to 33n that Kazuo san likes also.
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Old 16th April 2013, 08:09 PM   #5855
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still remained to fit in the zobel.ideally I would like to use mica`s but they are hard to find in values above 10nf
any recommendation on the arrangement in the attachment?
Attached Images
File Type: jpg reflektor pcb.jpg (185.7 KB, 323 views)
File Type: jpg reflektor schematic.jpg (83.6 KB, 326 views)
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Old 16th April 2013, 08:11 PM   #5856
Salas is offline Salas  Greece
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Its wrong to have common ground plane when wanting force and sense. Those two pairs meet at the load only on both ends.
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Old 16th April 2013, 08:23 PM   #5857
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on the pcb side the gnd only surrounds Vsense-
the wires between reflektor and dac will be very short, below 10 cm

for the current mirror bjt`s I paired right Q5Q7 and Q6Q8?
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Old 16th April 2013, 08:28 PM   #5858
Salas is offline Salas  Greece
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Only q5,7 may be bonded, the pairings are good. Sense and force grounds should be completely separate for any length of wires.
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Old 16th April 2013, 09:37 PM   #5859
asdiasx is offline asdiasx  Brazil
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I'd like to use this layout...
Schultzsch, did you alread build this?
Salas, I can see the sensors are isolated (draw att)... So, no problem yah?
reflektor pcb sensor.jpg
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Old 16th April 2013, 09:42 PM   #5860
Salas is offline Salas  Greece
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I did not see so in the schematic. Had no GND arrows. Really done split it should be OK.
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