Electronics > Beginners
2SK117 replacement for a Curiously Low Noise Amplifier
mycroft:
Folks,
I want to build a couple of these Curiously Low Noise Amplifier from Charles Wenzel site (http://techlib.com/electronics/audioamps.html#curiously%20low%20noise) but the input JFET is no longer available. I intend to use them to measure power supply ripple and noise and some low noise sensors. Any suggestions on a suitable replacement?
Thanks.
andy3055:
Here is a source: https://www.digipart.com/part/2SK117
Kleinstein:
The SK209 is relatively similar, just in SOT23 case. To92 or similar case JFETs are becoming more and more difficult to get.
Anyway also keep an eye on the sub-group (e.g. color code) for Ids.
David Hess:
If the LSK189 from Linear Systems is not suitable, then I am sure they have a part which is. Or a dual part like the LSK389 could be used in parallel. Interfet should have something suitable.
Kleinstein:
Usually the choice of JFETs from a more local supplier is relatively limited and especially TO92 parts are often NOS or similar - so it really depends on the source where you get the parts. One may still get the 2SK117 (at least in Germany). Otherwise check the usually limited list that is available.
Modern JFETs usually come in SOT23 or similar.
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