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On Thursday, July 4, 2019 at 5:07:55 PM UTC-4, John Larkin wrote:
On 4 Jul 2019 11:23:58 -0700, Winfield Hill
wrote:
Bill Sloman wrote...
[ snip ]
Bill, you're getting awfully snarky in your old age.
He should design something. He might feel better.
Did he ever finish that world shaking low distortion oscillator he started about a decade ago?
On Thu, 04 Jul 2019 20:09:15 -0500, amdx wrote:
Maybe you did, but I see by your responses to John's posts, you are
very jealous of what he does.
Mikek
'Envious and resentful' pretty much covers it.
o pere o wrote:
On 4/7/19 12:29, Robert Baer wrote:
  2-terminal negative resistance circuits anyone?
  Most especially "Z" types.
  Thanks.
Cross-coupled transistor pair.
Pere
 Sorry, do not see it. How about a SPICE to show it?
Thanks.
On Fri, 5 Jul 2019 21:43:31 -0000 (UTC), Cursitor Doom
curd@notformail.com> wrote:
On Thu, 04 Jul 2019 20:09:15 -0500, amdx wrote:
Maybe you did, but I see by your responses to John's posts, you are
very jealous of what he does.
'Envious and resentful' pretty much covers it.
That sums up "leftism" pretty well.
On Thu, 04 Jul 2019 20:09:15 -0500, amdx wrote:
Maybe you did, but I see by your responses to John's posts, you are
very jealous of what he does.
'Envious and resentful' pretty much covers it.
On 7/4/19 10:25 PM, Michael Terrell wrote:
On Thursday, July 4, 2019 at 5:07:55 PM UTC-4, John Larkin wrote:
On 4 Jul 2019 11:23:58 -0700, Winfield Hill
wrote:
Bill Sloman wrote...
 [ snip ]
Bill, you're getting awfully snarky in your old age.
He should design something. He might feel better.
Did he ever finish that world shaking low distortion oscillator he
started about a decade ago?
Who needs women in one's life when senior citizens can provide the same
amount drama at a much lower price! Cat fight! Cat fight!
On 7/7/2019 10:38 PM, bitrex wrote:
On 7/4/19 10:25 PM, Michael Terrell wrote:
On Thursday, July 4, 2019 at 5:07:55 PM UTC-4, John Larkin wrote:
On 4 Jul 2019 11:23:58 -0700, Winfield Hill
wrote:
Bill Sloman wrote...
 [ snip ]
Bill, you're getting awfully snarky in your old age.
He should design something. He might feel better.
Did he ever finish that world shaking low distortion oscillator he
started about a decade ago?
Who needs women in one's life when senior citizens can provide the same
amount drama at a much lower price! Cat fight! Cat fight!
Yes, except one cat just keeps moving forward getting things done
while the other acts like a kitten pawing at his heels.
Bill Sloman wrote:
On Thursday, July 4, 2019 at 4:35:04 PM UTC+2, John Larkin wrote:
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.
Would that be an example of negative resistance?
On 2019-07-05 09:09, piglet wrote:
On 04/07/2019 10:43 pm, Dave Platt wrote:
Lambda diode (e.g. two JFETs).
Or indeed one fet and one bjt.
piglet
Like https://w3jdr.wordpress.com/lambda-diode-experiments/
Nice circuit! Why isn't that in the AoE?
(at least not in the index)
Arie
On Friday, July 5, 2019 at 3:20:56 AM UTC-4, Arie de Muynck wrote:
On 2019-07-05 09:09, piglet wrote:
On 04/07/2019 10:43 pm, Dave Platt wrote:
Lambda diode (e.g. two JFETs).
Or indeed one fet and one bjt.
piglet
Like https://w3jdr.wordpress.com/lambda-diode-experiments/
Nice circuit! Why isn't that in the AoE?
(at least not in the index)
Arie
Fun thread! Can someone explain (hand waving is fine) what the pnp
is doing in the above circuit? I can understand the classic lamda diode.
Here,
http://www.vk6fh.com/vk6fh/lambda_diode.htm
And keep trying to see the pnp as some current source.
George H.
(My description is for theOn 2019-07-08 19:24, George Herold wrote:
On Friday, July 5, 2019 at 3:20:56 AM UTC-4, Arie de Muynck wrote:
On 2019-07-05 09:09, piglet wrote:
On 04/07/2019 10:43 pm, Dave Platt wrote:
Lambda diode (e.g. two JFETs).
Or indeed one fet and one bjt.
piglet
Like https://w3jdr.wordpress.com/lambda-diode-experiments/
Nice circuit! Why isn't that in the AoE?
(at least not in the index)
Arie
Fun thread! Can someone explain (hand waving is fine) what the pnp
is doing in the above circuit? I can understand the classic lamda diode.
Here,
http://www.vk6fh.com/vk6fh/lambda_diode.htm
And keep trying to see the pnp as some current source.
George H.
No, the PNP is an emitter follower with a low output impedance toward
the FET. A low V1 produces a low J1 source voltage, the FET is on and
draws current. When the V1 voltage rises, the PNP emitter and the FET
source voltage rises too, the FET sees a lower Vgs and cuts off, so the
total current drawn diminishes. Hence, the negative resistance effect.
When the FET is fully cut off the remaining impedance is only R1 + R2.
Arie
On Friday, July 5, 2019 at 3:20:56 AM UTC-4, Arie de Muynck wrote:
On 2019-07-05 09:09, piglet wrote:
On 04/07/2019 10:43 pm, Dave Platt wrote:
Lambda diode (e.g. two JFETs).
Or indeed one fet and one bjt.
piglet
Like https://w3jdr.wordpress.com/lambda-diode-experiments/
Nice circuit! Why isn't that in the AoE?
(at least not in the index)
Arie
Fun thread! Can someone explain (hand waving is fine) what the pnp
is doing in the above circuit? I can understand the classic lamda diode.
Here,
http://www.vk6fh.com/vk6fh/lambda_diode.htm
And keep trying to see the pnp as some current source.
George H.
On 2019-07-08 19:24, George Herold wrote:
On Friday, July 5, 2019 at 3:20:56 AM UTC-4, Arie de Muynck wrote:
On 2019-07-05 09:09, piglet wrote:
On 04/07/2019 10:43 pm, Dave Platt wrote:
Lambda diode (e.g. two JFETs).
Or indeed one fet and one bjt.
piglet
Like https://w3jdr.wordpress.com/lambda-diode-experiments/
Nice circuit! Why isn't that in the AoE?
(at least not in the index)
Arie
Fun thread! Can someone explain (hand waving is fine) what the pnp
is doing in the above circuit? I can understand the classic lamda diode.
Here,
http://www.vk6fh.com/vk6fh/lambda_diode.htm
And keep trying to see the pnp as some current source.
George H.
No, the PNP is an emitter follower with a low output impedance toward
the FET. A low V1 produces a low J1 source voltage, the FET is on and
draws current. When the V1 voltage rises, the PNP emitter and the FET
source voltage rises too, the FET sees a lower Vgs and cuts off, so the
total current drawn diminishes. Hence, the negative resistance effect.
When the FET is fully cut off the remaining impedance is only R1 + R2.
Arie
On 2019-07-08 19:24, George Herold wrote:
On Friday, July 5, 2019 at 3:20:56 AM UTC-4, Arie de Muynck wrote:
On 2019-07-05 09:09, piglet wrote:
On 04/07/2019 10:43 pm, Dave Platt wrote:
Lambda diode (e.g. two JFETs).
Or indeed one fet and one bjt.
piglet
Like https://w3jdr.wordpress.com/lambda-diode-experiments/
Nice circuit! Why isn't that in the AoE?
(at least not in the index)
Arie
Fun thread! Can someone explain (hand waving is fine) what the pnp
is doing in the above circuit? I can understand the classic lamda diode.
Here,
http://www.vk6fh.com/vk6fh/lambda_diode.htm
And keep trying to see the pnp as some current source.
George H.
In http://www.vk6fh.com/vk6fh/lambda_diode.htm I see the circuit
differently, not as a lambda diode.
T1 (FET) is a high input impedance voltage source follower, T2 (PNP) is
a grounded base amplifier with a high impedance current output.
There is no phase reversal. The gain is set by varying the FET Vgs,
changing its transconductance.
Arie