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71153

Re: Another JFET question

On Wed, Aug 5, 2015 at 4:43 AM, Barry n4buq@... ... 80 uA is on the low side, but there're some JFETs with Idss in this range. Without looking at the
Francesco Messineo
11:07 PM
#71153
 
71152

Re: Another JFET question

... Not for the 2N4117 that we were talking about recently: IDSS 30-90uA 2N4117A is even weaker: 15-90uA
David DiGiacomo
9:11 PM
#71152
 
71151

Re: Another JFET question

Hi Barry, 80ua Ids is too weak for a JFET that is connected properly. I suspect that you have the connections wrong, and are using the gate as the drain, or
Chuck Harris
8:34 PM
#71151
 
71150

Re: Another JFET question

BTW, in any of the tests, I did not try reversing the polarity of Vds. I was thinking that should not matter but perhaps it might on the 1855-0298? Thanks,
Barry
7:46 PM
#71150
 
71149

Re: Another JFET question

This evening, I put together a small test circuit to get a little more insight into these JFETs I have. Source is tied to ground and a variable power supply is
Barry
7:43 PM
#71149
 
71148

Re: HP Nanoprocessor

Great stuff! Thanks for scanning that. -Dave On 08/04/2015 08:56 PM, Paul Berger phb.hfx@... ... -- Dave McGuire, AK4HZ New Kensington, PA
Dave McGuire
6:23 PM
#71148
 
71147

Re: HP Nanoprocessor

This is wonderful! A great bit of history! Peter
Peter Gottlieb
6:02 PM
#71147
 
71146

HP Nanoprocessor

A while ago Larry Bower offered up some documentation on the nanoprocessor which I have now scanned and is available at
Paul Berger
5:56 PM
#71146
 
71145

Re: HP 1980 scope

Dennis: The input problem is resolved. Traces are equal on both channels. I have another problem that I tried to deal with before. I was not successful. I
wallydoc
2:07 PM
#71145
 
71144

Virtually FREE upgrade of 4284A LCR meter to option 006 (2 m and 4 m

I have a 4284A LCR meter and wanted to add support for longer test leads - by default it supports only 0 m (i.e. directly on the instrument) and 1 m. Any
Dr. David Kirkby (Kirkby Microwave Ltd)
Aug 4
#71144
 
71143

Re: Another JFET question

Hi Ed. Yes, I think your other message answered my question. I really should look into a more sophisticated test setup. Thanks! Barry - N4BUQ
Barry
Aug 3
#71143
 
71142

Re: Another JFET question

Well you intrigued me, I found a copy on Amazon for $1.60. I think I may already have a copy bought new but have a lot of books in storage. ... -- Richard
`Richard Knoppow
Aug 3
#71142
 
71141

Re: HP 1980 scope

Take a look at the parallel discussion regarding a JFET used as a diode - it's the same basic story, using a transistor junction as a protective clamp diode.
edbreya
Aug 3
#71141
 
71140

HP Equipment for Sale (Houston)

Greetings HP Group, I usually give away excess test equipment to members of this group. However, I have some very large and heavy pieces that I must sell in
jcline01@sbcglobal.net
Aug 3
#71140
 
71139

Re: HP 1980 scope

Hi Dennis! I blew the front end of channel one working on a tube rig (Collons KWM2) the "diode" I am speaking of is CR1 on Page 8-125 Sheet trigger attenuator.
wallydoc
Aug 3
#71139
 
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