R
Robert Baer
Guest
2-terminal negative resistance circuits anyone?
Most especially "Z" types.
Thanks.
Most especially "Z" types.
Thanks.
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J
Jan Panteltje
Guest
On a sunny day (Thu, 4 Jul 2019 02:29:38 -0800) it happened Robert Baer
<robertbaer@localnet.com> wrote in <ZFjTE.67465$GS1.17679@fx48.iad>:
neon bulb
<robertbaer@localnet.com> wrote in <ZFjTE.67465$GS1.17679@fx48.iad>:
2-terminal negative resistance circuits anyone?
Most especially "Z" types.
Thanks.
neon bulb
J
Jan Panteltje
Guest
On a sunny day (Thu, 4 Jul 2019 02:29:38 -0800) it happened Robert Baer
<robertbaer@localnet.com> wrote in <ZFjTE.67465$GS1.17679@fx48.iad>:
https://en.wikipedia.org/wiki/Tunnel_diode
<robertbaer@localnet.com> wrote in <ZFjTE.67465$GS1.17679@fx48.iad>:
2-terminal negative resistance circuits anyone?
Most especially "Z" types.
Thanks.
https://en.wikipedia.org/wiki/Tunnel_diode
Guest
On Thursday, 4 July 2019 11:24:47 UTC+1, Jan Panteltje wrote:
Carbon arc
Fluorescent tube
Pretty much any discharge lamp
Carbon pile with solenoid
Nernst lamp
NT
On a sunny day (Thu, 4 Jul 2019 02:29:38 -0800) it happened Robert Baer
robertbaer@localnet.com> wrote in <ZFjTE.67465$GS1.17679@fx48.iad>:
2-terminal negative resistance circuits anyone?
Most especially "Z" types.
Thanks.
neon bulb
Carbon arc
Fluorescent tube
Pretty much any discharge lamp
Carbon pile with solenoid
Nernst lamp
NT
Guest
Lambda diode
Cheers
Phil Hobbs
Cheers
Phil Hobbs
J
John Larkin
Guest
On Thu, 4 Jul 2019 02:29:38 -0800, Robert Baer
<robertbaer@localnet.com> wrote:
As a college ee project, I built a 2-terminal negative resistance box,
with an opamp and a couple of 9 volt batteries. If you plug in a
negative value for R into the common RC and RLC circuits, the math
still works and the waveforms are radical.
I don't think my instructor understood it. They tended to not
understand a lot of things that I did. That's another discussion.
--
John Larkin Highland Technology, Inc trk
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
<robertbaer@localnet.com> wrote:
2-terminal negative resistance circuits anyone?
Most especially "Z" types.
Thanks.
As a college ee project, I built a 2-terminal negative resistance box,
with an opamp and a couple of 9 volt batteries. If you plug in a
negative value for R into the common RC and RLC circuits, the math
still works and the waveforms are radical.
I don't think my instructor understood it. They tended to not
understand a lot of things that I did. That's another discussion.
--
John Larkin Highland Technology, Inc trk
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
W
Winfield Hill
Guest
Robert Baer wrote...
Switching regulators, working into fixed loads,
have negative input resistance, at DC anyway.
Current draw goes up as you lower input voltage.
--
Thanks,
- Win
2-terminal negative resistance circuits anyone?
Switching regulators, working into fixed loads,
have negative input resistance, at DC anyway.
Current draw goes up as you lower input voltage.
--
Thanks,
- Win
B
Bill Sloman
Guest
On Thursday, July 4, 2019 at 4:35:04 PM UTC+2, John Larkin wrote:
One might suspect that he understood it better than you did, and consequently wasn't giving you the sort of postive feedback that you seem expect from all your interactions.
> They tended to not understand a lot of things that I did. That's another discussion.
Then again, neither do you, and you aren't great at discussion - if you aren't getting praised, you stop listening.
--
Bill Sloman, sydney
On Thu, 4 Jul 2019 02:29:38 -0800, Robert Baer
robertbaer@localnet.com> wrote:
2-terminal negative resistance circuits anyone?
Most especially "Z" types.
Thanks.
As a college ee project, I built a 2-terminal negative resistance box,
with an opamp and a couple of 9 volt batteries. If you plug in a
negative value for R into the common RC and RLC circuits, the math
still works and the waveforms are radical.
I don't think my instructor understood it.
One might suspect that he understood it better than you did, and consequently wasn't giving you the sort of postive feedback that you seem expect from all your interactions.
> They tended to not understand a lot of things that I did. That's another discussion.
Then again, neither do you, and you aren't great at discussion - if you aren't getting praised, you stop listening.
--
Bill Sloman, sydney
W
Winfield Hill
Guest
Bill Sloman wrote...
Bill, you're getting awfully snarky in your old age.
--
Thanks,
- Win
[ snip ]
Bill, you're getting awfully snarky in your old age.
--
Thanks,
- Win
A
amdx
Guest
On 7/4/2019 5:57 AM, tabbypurr@gmail.com wrote:
scooping some with an aluminum scoop, he did a measurement, and said
hey, this has negative resistance. I didn't pay much attention, and not
sure what he said is fact, but he was a very intelligent guy.
Mikek
Physicist boss was using corundum as an abrasive on PZT8, whileOn Thursday, 4 July 2019 11:24:47 UTC+1, Jan Panteltje wrote:
On a sunny day (Thu, 4 Jul 2019 02:29:38 -0800) it happened Robert Baer
robertbaer@localnet.com> wrote in <ZFjTE.67465$GS1.17679@fx48.iad>:
2-terminal negative resistance circuits anyone?
Most especially "Z" types.
Thanks.
neon bulb
Carbon arc
Fluorescent tube
Pretty much any discharge lamp
Carbon pile with solenoid
Nernst lamp
NT
scooping some with an aluminum scoop, he did a measurement, and said
hey, this has negative resistance. I didn't pay much attention, and not
sure what he said is fact, but he was a very intelligent guy.
Mikek
J
John Larkin
Guest
On 4 Jul 2019 11:23:58 -0700, Winfield Hill <winfieldhill@yahoo.com>
wrote:
He should design something. He might feel better.
--
John Larkin Highland Technology, Inc trk
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
wrote:
Bill Sloman wrote...
[ snip ]
Bill, you're getting awfully snarky in your old age.
He should design something. He might feel better.
--
John Larkin Highland Technology, Inc trk
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
B
Bill Sloman
Guest
On Thursday, July 4, 2019 at 5:37:40 PM UTC+2, Winfield Hill wrote:
Philips had a rather neat circuit for running a DC motor at constant speed even when the load varied - you measured the voltage across the motor, and the current through it, and made sure that the voltage across the motor was equal to the back-emf that you wanted (and the rotation speed) plus the voltage drop in the motor windings.
I used it once, and it worked fine, but you did have to roll off the the negative resistance at higher frequencies.
--
Bill Sloman, Sydney
Robert Baer wrote...
2-terminal negative resistance circuits anyone?
Switching regulators, working into fixed loads,
have negative input resistance, at DC anyway.
Current draw goes up as you lower input voltage.
Philips had a rather neat circuit for running a DC motor at constant speed even when the load varied - you measured the voltage across the motor, and the current through it, and made sure that the voltage across the motor was equal to the back-emf that you wanted (and the rotation speed) plus the voltage drop in the motor windings.
I used it once, and it worked fine, but you did have to roll off the the negative resistance at higher frequencies.
--
Bill Sloman, Sydney
D
Dave Platt
Guest
In article <4a9f2f87-c6e3-42d4-9299-7a989eaaca3c@googlegroups.com>,
<tabbypurr@gmail.com> wrote:
Lambda diode (e.g. two JFETs).
<tabbypurr@gmail.com> wrote:
On Thursday, 4 July 2019 11:24:47 UTC+1, Jan Panteltje wrote:
On a sunny day (Thu, 4 Jul 2019 02:29:38 -0800) it happened Robert Baer
robertbaer@localnet.com> wrote in <ZFjTE.67465$GS1.17679@fx48.iad>:
2-terminal negative resistance circuits anyone?
Most especially "Z" types.
Thanks.
neon bulb
Carbon arc
Fluorescent tube
Pretty much any discharge lamp
Carbon pile with solenoid
Nernst lamp
Lambda diode (e.g. two JFETs).
B
Bill Sloman
Guest
On Thursday, July 4, 2019 at 11:07:55 PM UTC+2, John Larkin wrote:
I feel fine. I've even designed some stuff recently - though the NSW IEEE July Newsletter is not the kind of electronic design that John Larkin would like us to think that he is thinking of.
Coming home from an excellent dinner in a three star restaurant is an even better way of getting to feel fine, though it doesn't seem to make me any more tolerant of half-baked opinions.
--
Bill Sloman, Sydney
On 4 Jul 2019 11:23:58 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:
Bill Sloman wrote...
[ snip ]
Bill, you're getting awfully snarky in your old age.
He should design something. He might feel better.
I feel fine. I've even designed some stuff recently - though the NSW IEEE July Newsletter is not the kind of electronic design that John Larkin would like us to think that he is thinking of.
Coming home from an excellent dinner in a three star restaurant is an even better way of getting to feel fine, though it doesn't seem to make me any more tolerant of half-baked opinions.
--
Bill Sloman, Sydney
B
Bill Sloman
Guest
On Thursday, July 4, 2019 at 8:24:12 PM UTC+2, Winfield Hill wrote:
I like to think of myself as more of boojum.
--
Bill Sloman, Sydney
Bill Sloman wrote...
[ snip ]
Bill, you're getting awfully snarky in your old age.
I like to think of myself as more of boojum.
--
Bill Sloman, Sydney
W
whit3rd
Guest
On Thursday, July 4, 2019 at 7:35:04 AM UTC-7, John Larkin wrote:
Parallel such a box with a variable resistor, and make a
quartz crystal tester (which starts from white noise when the 'gain' reaches
Barkhausen's criterion).
I'd be thinking of using a LM13700 instead of op amp, though. Transconductance
is a the property you want, it just takes a bias resistor or two.
As a college ee project, I built a 2-terminal negative resistance box,
with an opamp and a couple of 9 volt batteries. If you plug in a
negative value for R into the common RC and RLC circuits, the math
still works and the waveforms are radical.
Parallel such a box with a variable resistor, and make a
quartz crystal tester (which starts from white noise when the 'gain' reaches
Barkhausen's criterion).
I'd be thinking of using a LM13700 instead of op amp, though. Transconductance
is a the property you want, it just takes a bias resistor or two.
Guest
On Thu, 04 Jul 2019 14:07:44 -0700, John Larkin
<jjlarkin@highlandtechnology.com> wrote:
Not possible. Either sentence.
<jjlarkin@highlandtechnology.com> wrote:
On 4 Jul 2019 11:23:58 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:
Bill Sloman wrote...
[ snip ]
Bill, you're getting awfully snarky in your old age.
He should design something. He might feel better.
Not possible. Either sentence.
J
John Larkin
Guest
On Thu, 04 Jul 2019 19:03:31 -0400, krw@notreal.com wrote:
Oh. Sorry.
--
John Larkin Highland Technology, Inc trk
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
On Thu, 04 Jul 2019 14:07:44 -0700, John Larkin
jjlarkin@highlandtechnology.com> wrote:
On 4 Jul 2019 11:23:58 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:
Bill Sloman wrote...
[ snip ]
Bill, you're getting awfully snarky in your old age.
He should design something. He might feel better.
Not possible. Either sentence.
Oh. Sorry.
--
John Larkin Highland Technology, Inc trk
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
J
John Larkin
Guest
On Thu, 4 Jul 2019 15:51:29 -0700 (PDT), whit3rd <whit3rd@gmail.com>
wrote:
I used a slow opamp, 709 or maybe 741 by then, so it was only good to
100 KHz or so. Not so good for testing crystals.
How would you make a 2-terminal negative resistor with an LM13700?
--
John Larkin Highland Technology, Inc trk
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
wrote:
On Thursday, July 4, 2019 at 7:35:04 AM UTC-7, John Larkin wrote:
As a college ee project, I built a 2-terminal negative resistance box,
with an opamp and a couple of 9 volt batteries. If you plug in a
negative value for R into the common RC and RLC circuits, the math
still works and the waveforms are radical.
Parallel such a box with a variable resistor, and make a
quartz crystal tester (which starts from white noise when the 'gain' reaches
Barkhausen's criterion).
I'd be thinking of using a LM13700 instead of op amp, though. Transconductance
is a the property you want, it just takes a bias resistor or two.
I used a slow opamp, 709 or maybe 741 by then, so it was only good to
100 KHz or so. Not so good for testing crystals.
How would you make a 2-terminal negative resistor with an LM13700?
--
John Larkin Highland Technology, Inc trk
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
A
amdx
Guest
On 7/4/2019 5:12 PM, Bill Sloman wrote:
Maybe you did, but I see by your responses to John's posts, you are
very jealous of what he does.
Mikek
On Thursday, July 4, 2019 at 11:07:55 PM UTC+2, John Larkin wrote:
On 4 Jul 2019 11:23:58 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:
Bill Sloman wrote...
[ snip ]
Bill, you're getting awfully snarky in your old age.
He should design something. He might feel better.
I feel fine. I've even designed some stuff recently - though the NSW IEEE July Newsletter is not the kind of electronic design that John Larkin would like us to think that he is thinking of.
Coming home from an excellent dinner in a three star restaurant is an even better way of getting to feel fine, though it doesn't seem to make me any more tolerant of half-baked opinions.
Maybe you did, but I see by your responses to John's posts, you are
very jealous of what he does.
Mikek