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#1 |
diyAudio Member
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In looking at this high power jfet I wonder if it might be suitable for a small low impedance source follower in the 50 to 100ma range. Does anyone know if it would be very noisy when used like that with a 500 ohm source impedance ?
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#2 |
diyAudio Member
Join Date: May 2011
Location: Russia, Moscow
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What signal swing are desired?
In the --someVolt range i suppose noise will not be the problem. |
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#3 |
diyAudio Member
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I was thinking about 5v 50 ma at 15v drain to source with a 500 ohm input source resistance at 1k hrz.
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#4 |
diyAudio Member
Join Date: May 2011
Location: Russia, Moscow
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For ~100 Ohm headphones?
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#5 |
diyAudio Member
Join Date: Dec 2017
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Is this an amplifier for speakers???
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__________________
I don't understand what I am doing, but everything people are telling me is wrong ![]() ![]() |
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#6 |
diyAudio Member
Join Date: May 2011
Location: Russia, Moscow
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#8 |
diyAudio Member
Join Date: Mar 2003
Location: Haarlem, the Netherlands
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It has a high transconductance and it must have a large die area, so chances are its equivalent input voltage noise level will be quite low. Current noise will be low(*) as long as you reverse bias the gate, which will happen automatically at 50 mA to 100 mA.
(*): Regarding noise current, a smaller JFET will be even better, but you will only notice that at very high source impedances, like those of condenser microphone capsules without built-in amplifier. Last edited by MarcelvdG; 8th January 2021 at 04:22 PM. |
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#9 |
diyAudio Member
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Here's the Zen9 "noise" -- to get flat frequency response (into a 6 ohm passive load) I had to increase Vds to 2.12, and lower the current to 1.6A. Gain is 21dB.
I've run the LU1014 on its own, not yet satisfied with the results. |
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#10 |
diyAudio Member
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Here's the LU1014D all by itself, powered by Groner's ultra low noise current source (400pA/RtHz), adjusted to 50mA:
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