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SIT measurements, Mu Follower, and amplifier build
SIT measurements, Mu Follower, and amplifier build
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Old 10th February 2020, 01:12 AM   #21
lhquam is offline lhquam  United States
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In future posts I will attempt to tie together the SIT mu follower with the SIT sweet spot parameter behavior posted earlier. The important result will be that class-A output power level can be significantly increased using the mu follower.
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Old 10th February 2020, 04:41 PM   #22
N101N is offline N101N
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Quote:
The important result will be that class-A output power level can be significantly increased using the mu follower.
Yes, significantly increased distortion as a consequence. Any deviation from the test configuration, such as balanced mode, paralleled devices, forward biasing, leads to a deprivation of characteristics.
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Old 10th February 2020, 04:59 PM   #23
Nelson Pass is offline Nelson Pass  United States
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SIT measurements, Mu Follower, and amplifier build
Quote:
Originally Posted by lhquam View Post
The 3rd figure shows a collection of sweeps of THD vs Watts sweeps of the for the left and right channels, respectively.
Very consistent with my numbers.
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Old 10th February 2020, 05:14 PM   #24
balatskayanika is offline balatskayanika
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I really like the IXYS depletion mode N-channel parts.
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Old 10th February 2020, 06:15 PM   #25
lhquam is offline lhquam  United States
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Very consistent with my numbers.
Are your numbers with a similar 2SK182 based mu follower?
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Old 10th February 2020, 06:17 PM   #26
lhquam is offline lhquam  United States
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Originally Posted by balatskayanika View Post
I really like the IXYS depletion mode N-channel parts.
What do you like about the depletion mode parts other than the bias voltage?
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Old 10th February 2020, 08:32 PM   #27
Nelson Pass is offline Nelson Pass  United States
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SIT measurements, Mu Follower, and amplifier build
Quote:
Originally Posted by lhquam View Post
Are your numbers with a similar 2SK182 based mu follower?
Here are some curves with CS mode/mu follower and also CCS and CD
curves with CCS.

60V supply, about 3A current.
Attached Images
File Type: gif 2sk182 cs damp 8.gif (17.8 KB, 297 views)
File Type: gif 2sk182 cd damp 8.gif (18.1 KB, 296 views)
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Old 11th February 2020, 12:40 PM   #28
Michael Rothacher is offline Michael Rothacher  United States
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SIT measurements, Mu Follower, and amplifier build
Let's of fun info in this thread!
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Old 11th February 2020, 05:45 PM   #29
lhquam is offline lhquam  United States
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The SIT sweet spot measurement circuit shown in post #2 can be converted to an equivalent circuit that is similar to the FirstWatt SIT-1, and the 4-parameters of the surface parameters shown in post #10 can be used to compute the "SIT-1" sweet spot for a given rail voltage Vrail, output load resistance Rload, and desired bias current Id.
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File Type: jpg SIT-bench-test-to-SIT1-1b.asc.jpg (233.6 KB, 249 views)
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Old 11th February 2020, 07:24 PM   #30
Nelson Pass is offline Nelson Pass  United States
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Default Sit's Alive!

New DIY Sony channel finally seeing the light.

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