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F5 with 2SK2013/2SJ313
F5 with 2SK2013/2SJ313
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Old 27th December 2017, 12:29 AM   #771
PiotrL is offline PiotrL  Ireland
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F5 with 2SK2013/2SJ313
Thanks Fred. I guess I should have dig deeper, regardless that this picture mentions 2sj74 ...
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Old 27th December 2017, 10:24 AM   #772
AndrewT is offline AndrewT  Scotland
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for a small signal jFET the Vgs = zero volts if you want the Current to be Idss and Vds=10Volts and Tj=25degrees C

As you increase the Nchannel Vgs to slightly negative the Id reduces to less than Idss.
This is shown on the graph in the datasheet.
When the Vgs has increased to -1V the Id is down below 1uA
Read Borbely, he is my expert when it comes to FETs.
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Old 30th December 2017, 08:10 PM   #773
PiotrL is offline PiotrL  Ireland
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F5 with 2SK2013/2SJ313
Thanks Andrew, this is great stuff.

MOSFET are still on their way to Ireland, but I could put together PSU, both cap multipliers and one channel of the amp.

As mentioned previously, I have added socket pins in parallel with source resistors, feedback resistors and also for cap multiplier LEDs and their resistors. This will come handy for experimenting with different setups.

Potentiometers are already set to 0. I have also chosen to use 4.7k resistors in parallel with pots, as it was mentioned earlier in the thread.
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File Type: jpg PSU1.jpg (233.1 KB, 128 views)
File Type: jpg PSU2.jpg (272.4 KB, 117 views)
File Type: jpg CapMul_1.jpg (157.6 KB, 116 views)
File Type: jpg CapMul_2.jpg (175.1 KB, 117 views)
File Type: jpg CapMul_sockets.jpg (214.2 KB, 57 views)
File Type: jpg F5.jpg (136.8 KB, 50 views)
File Type: jpg F5_source_sockets.jpg (222.0 KB, 49 views)
File Type: jpg F5_feedback_sockets.jpg (242.4 KB, 54 views)
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Old 1st January 2018, 02:40 AM   #774
konst is offline konst  United States
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XRK, what are the resistors you are using for the freewire build?
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Old 1st January 2018, 03:21 PM   #775
xrk971 is offline xrk971  United States
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F5 with 2SK2013/2SJ313
Quote:
Originally Posted by konst View Post
XRK, what are the resistors you are using for the freewire build?

Which resistor are you referring to?
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