Adding filter to a INA217...

[Phil Allison]

Jan Panteltje wrote:
===================

One ant heap against the other, does it make us as species stronger?
WW2 gave us missiles (Von Braun) and eventually got us to the moon, gave us radar,
jet engines... nukes...


All of that would have happened, without killing a hundred million
people.

** Missiles, jet engines and nukes hardly killed anyone.
Bout 0.1 % of that number.
Good old bullets, bayonets and Zylon B gas did the rest.

Problem is, you cannot stop a war without killing people.
The more and easier you do it, the quicker it stops.

> Do wars have a purpose?

Those who start them seek a benefit, the rest just try to stay alive and save their homes.


...... Phil

 

[David Brown]

On 23/02/2022 00:57, John Larkin wrote:

On Tue, 22 Feb 2022 22:50:33 +0100, David Brown
david.brown@hesbynett.no> wrote:

On 22/02/2022 18:01, jlarkin@highlandsniptechnology.com wrote:
On Tue, 22 Feb 2022 16:51:27 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Tue, 22 Feb 2022 07:15:39 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
oev91h9ke0vp38obuv8bsbtbfok99dpleo@4ax.com>:

Is it a crime there to assault a burgler in your house?

Well, we have been joking about that as no, you should welcome those burglars.
Problem is if you permanently disable one chances are you get sued
for using disproportional force or something.
I think its better now, but shooting one if you have no gun license may get you into big trouble.

OTOH its a lot of meat for in the deep freezer although I do not consume earthlings myself
bad for your health, way too fat.
Just had some fresh potato chips from the duplicator...

Fixed my sat dish this morning, now the wind is down, wedge bolt pulled out of the wall by the storm!
Anyways it now aligned again, can see Russia RT, people in the areas that Russia now supports as peace-keeper
celebrating and having fireworks.
US imperialism and weapon stuffing (and UK) to Ukrain is evil.
So many lies, just like weapons of mass destruction in Iraq.
biden is a monster, just like his predecessor Bil Clignon was making war in Europe.


We have Joe for three, or barely possibly 7 more years, but the
Russians have Putin for life.

Lust for territory is really weird. Germany, Japan, USSR, China. Makes
little sense.


Military aggression like this is often about improving popularity at
home rather than wanting more territory. Putin has being getting
steadily more authoritarian, and is perhaps not as popular as he has
been - attacking Ukraine and defying Nato and the UN distracts from that
and unites people back home.


I just read \"A Glorious Way To Die.\" The emperor wasn\'t so much the
driving force behind the brutal Japanese empire, but a big bunch of
militarists and ultra-nationalists. Sort of a collective madness.

Usually, it\'s one leader-for-life strongman and a crowd of toadies.

In the case of the Japanese, the \"leader-for-life\" was not strong enough
to resist his advisors who wanted empire expansion and war. The emperor
also wanted to surrender before the nukes were dropped, but his generals
would not let him. The first World War was also started by military
advisors - Emperor Franz Joseph was actually quite pleased that someone
had killed his heir and nephew, and wanted to thank the Serbs rather
than declare war on them. But his advisors pushed him into it.

I wonder if Putin\'s aggressions make him more popular at home. I\'d
guess not.

Rousing nationalism combined with propaganda, re-written history and
false \"facts\" can do wonders for your popularity. What we are seeing
here is \"Make Russia Great Again\". The same bullshit fooled half of the
American population, and I think it is working in Russia. (For those in
Russia that are not fooled, there\'s the carrot of knowing Putin is
actually quite a good president for their country, and the stick of
knowing that his opposition tends to disappear without trace.)

 

[Rick C]

On Wednesday, February 23, 2022 at 12:19:16 AM UTC-5, bitrex wrote:

On 2/22/2022 11:19 PM, Rick C wrote:
On Tuesday, February 22, 2022 at 9:29:16 PM UTC-5, bitrex wrote:
On 2/22/2022 9:17 AM, Rick C wrote:
On Tuesday, February 22, 2022 at 3:55:17 AM UTC-5, bitrex wrote:
On 2/22/2022 3:46 AM, Jan Panteltje wrote:
On a sunny day (Tue, 22 Feb 2022 02:24:08 -0500) it happened bitrex
us...@example.net> wrote in <tc0RJ.37177$r6p7....@fx41.iad>:

?

Indeed. Just as reporters make audio recordings of crowds, etc. There is nothing special about sound, as long as they are
informed or if the location is public enough, being informed is not required.


No way, there is something special about real-world conversations, they
fall under wiretapping laws. Private citizens have to obey wiretapping
laws. Basically if it\'s illegal to do to a wire between two telephones
it\'s illegal to do to the vibrating air between two human\'s mouths and
ears. Intent matters of course, recording a crowd or putting up a mic on
your property to record bird songs isn\'t the same thing.

Most modern security cameras have sound too, I have one like that.
There is a TV program here that mentions recent crimes and works with the police
they then ask everybody with a security camera or some other camera
or car camera in that area to upload the stuff, that way they track for example
where the bad guy\'s cars go, (many people have such private cameras).
what language the bad guys speak, and their pictures are then posted in the program
and online.
Sure if something happened here they can have my recordings.
5 security cams here (been robbed twice in Amsterdam).
Last time I was home, poor guy,...


I think in the US also there\'s a difference between audio/visual
recording of an area, and targeted audio-only recording, consult your
local statues

Just the opposite. Recording video and not sound has allowed people to get away with it in prior times before laws caught up with technology. But that was in situations where people had an expectation of privacy, like in an apartment or hotel room.

So every time someone makes a video on their phone of a cop arresting someone they are breaking the law?

No

You are just making up stuff.


Nah, you can\'t just go around electronically eavesdropping on people\'s
conversations without their informed consent. Not by tapping their
phones, and not by using some application-specific mic to target people
talking to each other in the real world at a distance, while they are
unaware of the presence of you and/or the equipment.

How much throwing up some sign indemnifies you I can\'t say for sure,
consult your local listings. Definitely not when they\'re not even on
your property!

But using a camcorder or cell phone cam to record audio and video of
people in a public place is NOT the same thing.

Yet you can\'t explain how it is different. So if the mic is accompanied by a video camera, does that make it legal?

I don\'t think you actually know anything about this. You are just shooting from the hip. I dug around a bit and recording someone in public, as in standing on a sidewalk or in the street, appears to be perfectly legal because there is no expectation of privacy. If you are in a home, a phone booth (one of the examples provided), anywhere that you can\'t be casually overheard by someone nearby, there\'s an expectation of privacy. That\'s not a street or sidewalk.

Most of what you find on the Internet about this has to do with law enforcement which is a totally different thing. For civil matters, providing a sign that you are being recorded means you have been informed, just like a trespassing sign. At least in the states where I have lived, there is no presumption that you are trespassing until you are informed. A sign is sufficient notification as long as you can see it.

Would you put up an informational sign that said \"Attention women:
angle-enhancement devices may be in use on this property to take photos
up your skirts. Please remove your skirts or leave now if you do not
consent to this practice.\"

Whether this constitutes proper \"informed consent\" I think you should
consult a lawyer.

Similarly for use of audio-enhancement devices to listen to or record
conversations, instead of angle-enhancement devices.

http://www.dmlp.org/legal-guide/recording-phone-calls-and-conversations

See section \"Can you record a phone call or conversation when you do not
have consent from one of the parties?\" about the necessity of consent,
not just informing.

Why are you being absurd about this? If you inform someone that conversations on the phone are recorded and they use the phone, that constitutes consent. That\'s what the sign does in this case. It informs, creating consent..

It\'s nice to see you actually consulted a reference, even if you did not understand what you read.


Rick C.

+-++ Get 1,000 miles of free Supercharging
+-++ Tesla referral code - https://ts.la/richard11209

 

[amdx]

On 2/22/2022 8:39 PM, bitrex wrote:

On 2/22/2022 8:49 AM, amdx wrote:

Tragic. But your time is probably better spent keeping your shit
locked up, put up a fence, and not being such a busy-body.

One of the downsides of home ownership is that you can get stuck
with difficult neighbors for a long time, unlike with a lease where
the landlord often won\'t be of much more help than the police, but
in many states if a neighbor in your complex is routinely doing
disruptive/illegal shit next door you have entirely just cause to
bust the lease at that point and move on, perhaps at only the cost
of your security deposit, if that.

It\'s usually the best plan as a tenant-at-will rather than hope
anyone else will solve your problem for you.

The neighbor surveillance is mostly just a reason for a project, so
what if I can hear the chit chat for one and a half minutes,

that gets me nothing. I could have recorded video at least 10 times.
My wife is outside much more she has seen the hand off many

more time than I have.

Yes, assuming you could overhear a conversation, what are you hoping
to accomplish with the data is a question. You know they\'re doing
drugs there and someone\'s likely providing them. But at best none of
what you capture would ever be admissible as evidence in a court.

Don\'t see how the particulars are particularly meaningful other than
to confirm what you kinda already know.

Conversations among druggies tend to be remarkably boring.

OK, can we get over this. As I said, I saw the plans for the Shotgun
mic, 30 years ago, I thought it was neat. Somehow I saw

the plans posted again and thought, I could try it. I do not have a good
reason, other than I no longer need to hunt and gather food,

I have a roof over my head, I have excess income and I don\'t have to
work. So this looked like fun.

 I may not think so when I try to unsolder and solder in different
value 0402 resistors and capacitors on the TS472 pcb I have.

                                     Mikek


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[amdx]

On 2/20/2022 4:00 AM, John Walliker wrote:

On Sunday, 20 February 2022 at 07:22:33 UTC, Jan Panteltje wrote:
On a sunny day (Sat, 19 Feb 2022 15:01:36 -0600) it happened amdx
am...@knology.net> wrote in <surlrj$tld$1...@dont-email.me>:
Thanks Jan, for now, I\'m just going to use simple RC filters that I
can construct on the PCB I bought.
One thing about microphones that just happened to me.
I have to align my satellite dish again, and I use my software on the PC to move it to a reference point,
the software generates a tone so I can hear if it is pointing right,
But PC is far away from dish...

I have this little FM transmitter
http://panteltje.com/panteltje/pic/fm_pic/
and then go outside with earphones and a portable FM radio in my pocket. on a ladder moving the dish.

That FM transmitter is about 200 mV pp audio in.
Wanted to test if I could use a cheap electret clip on mike to pickup the beep from the PC, if the sensitivity was enough,
without pre-amp.
It was! I got feedback from my earplugs to the mike a meter away, LOAD !

So contemplate using simple cheap electret mikes, huge output signal!
No over-complicated input circuits needed.
With transmitter next to mike no cables... not sure if noise level is low enough for your application,
but a simple pre-amp and FM 100% is very powerful.
The OP is already using a high-sensitivity electret mic. The AOM5024 has a
sensitivity of -24dBV/Pa when used with a 3V supply and 2.2k resistor. The noise
floor is 14dB(A) spl which is very good. This mic is one of the best in its class
and its cheap and readily available. It is VERY hard to find an outdoors environment
which is as quiet as 14dB(A), so the noise performance of this mic is good enough.
There is no point in using the 14k pullup resistor and higher bias voltage
(of up to a maximum of about 9V) UNLESS the mic is fed directly into the
virtual earth of an op-amp with a very short connection. The op-amp that has been
selected is over-complicated for this application as it has been designed for
differential amplification. This makes it harder to use than a simple op-amp.
There are plenty of better choices.
For example, the Texas Instruments OPA1641 (single) or OPA1642 (dual)
are low-noise J-FET input op-amps that would work well from a 9V battery
which could also provide the mic bias voltage. There are plenty
of other good choices, some with lower power consumption and/or
lower cost. The circuit can be very simple - as has already been suggested.
Capacitor couple the junction of the mic and pullup resistor to the -ve input
of the op-amp. Keep the connection very short. Select a feedback resistor
from output to -ve input to give the gain you want. (I did the calculation for
you a while back.) Shunt the feedback resistor with a capacitor to low-pass
filter the output. Set the +ve input of the op-amp to a mid-point voltage
obtained with a pair of high-value resistors between ground and power.
Decouple the mid-point with a large capacitor to ground.
If you have feedback problems from fluctuations in the power supply voltage
getting into the mic bias circuit, buffer the mid-point supply with the other half
of a dual op-amp configured as a unity gain buffer and feed the mic bias resistor
from the output of that buffer. By doing this you get a very well filtered bias
supply. Reduce the mic bias resistor to work with the reduced supply. The resistor
can be calculated on the basis that this mic draws about 0.5mA and works well
when the voltage at the junction of the mic and bias resistor is about 2V.
So if you have a total supply of 9V and use a buffered mid-point supply for the mic
of 4.5V then the best bias resistor would be about 5k.

John

Going back to this schematic and the 2.2kΩ resistors (R4 and R5) to
ground on the input. What do they set?

> https://www.dropbox.com/s/4b8bn9fu5r0wkk2/INA217%20with%20filters%20DB.jpg?dl=0

What effect would changing them to 1kΩ or 5kΩ have on the operation of
the amp?


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[Rick C]

On Wednesday, February 23, 2022 at 5:59:04 PM UTC-5, amdx wrote:

On 2/20/2022 4:00 AM, John Walliker wrote:
On Sunday, 20 February 2022 at 07:22:33 UTC, Jan Panteltje wrote:
On a sunny day (Sat, 19 Feb 2022 15:01:36 -0600) it happened amdx
am...@knology.net> wrote in <surlrj$tld$1...@dont-email.me>:
Thanks Jan, for now, I\'m just going to use simple RC filters that I
can construct on the PCB I bought.
One thing about microphones that just happened to me.
I have to align my satellite dish again, and I use my software on the PC to move it to a reference point,
the software generates a tone so I can hear if it is pointing right,
But PC is far away from dish...

I have this little FM transmitter
http://panteltje.com/panteltje/pic/fm_pic/
and then go outside with earphones and a portable FM radio in my pocket. on a ladder moving the dish.

That FM transmitter is about 200 mV pp audio in.
Wanted to test if I could use a cheap electret clip on mike to pickup the beep from the PC, if the sensitivity was enough,
without pre-amp.
It was! I got feedback from my earplugs to the mike a meter away, LOAD !

So contemplate using simple cheap electret mikes, huge output signal!
No over-complicated input circuits needed.
With transmitter next to mike no cables... not sure if noise level is low enough for your application,
but a simple pre-amp and FM 100% is very powerful.
The OP is already using a high-sensitivity electret mic. The AOM5024 has a
sensitivity of -24dBV/Pa when used with a 3V supply and 2.2k resistor. The noise
floor is 14dB(A) spl which is very good. This mic is one of the best in its class
and its cheap and readily available. It is VERY hard to find an outdoors environment
which is as quiet as 14dB(A), so the noise performance of this mic is good enough.
There is no point in using the 14k pullup resistor and higher bias voltage
(of up to a maximum of about 9V) UNLESS the mic is fed directly into the
virtual earth of an op-amp with a very short connection. The op-amp that has been
selected is over-complicated for this application as it has been designed for
differential amplification. This makes it harder to use than a simple op-amp.
There are plenty of better choices.
For example, the Texas Instruments OPA1641 (single) or OPA1642 (dual)
are low-noise J-FET input op-amps that would work well from a 9V battery
which could also provide the mic bias voltage. There are plenty
of other good choices, some with lower power consumption and/or
lower cost. The circuit can be very simple - as has already been suggested.
Capacitor couple the junction of the mic and pullup resistor to the -ve input
of the op-amp. Keep the connection very short. Select a feedback resistor
from output to -ve input to give the gain you want. (I did the calculation for
you a while back.) Shunt the feedback resistor with a capacitor to low-pass
filter the output. Set the +ve input of the op-amp to a mid-point voltage
obtained with a pair of high-value resistors between ground and power.
Decouple the mid-point with a large capacitor to ground.
If you have feedback problems from fluctuations in the power supply voltage
getting into the mic bias circuit, buffer the mid-point supply with the other half
of a dual op-amp configured as a unity gain buffer and feed the mic bias resistor
from the output of that buffer. By doing this you get a very well filtered bias
supply. Reduce the mic bias resistor to work with the reduced supply. The resistor
can be calculated on the basis that this mic draws about 0.5mA and works well
when the voltage at the junction of the mic and bias resistor is about 2V.
So if you have a total supply of 9V and use a buffered mid-point supply for the mic
of 4.5V then the best bias resistor would be about 5k.

John

Going back to this schematic and the 2.2kΩ resistors (R4 and R5) to
ground on the input. What do they set?

https://www.dropbox.com/s/4b8bn9fu5r0wkk2/INA217%20with%20filters%20DB.jpg?dl=0

What effect would changing them to 1kΩ or 5kΩ have on the operation of
the amp?

They set the input impedance of the amp. The 14k resistor on the mic sets the output impedance of the mic. You should understand this creates a voltage divider for the AC signal and also impacts the frequency response of the filter created by the cap. The RC is (14k + 2.2k) * 0.22 uF for a corner frequency of 45 Hz.

Just to be clear, in this design there is no AC signal on the inverting input, so C2 has no purpose. The only reason for R5 is to equalize the input offset voltage caused by the input bias current. Not important in this design unless maybe you are using very high gains.

You could also save the hassle of two power voltages by creating a bias point from two resistors and some caps. R4 and R5 are the only components that need to tie to it, unless the op amp requires an actual ground connection.. I don\'t have a data sheet open on that. I think the grounded pin on the op amp in the schematic you have is showing a reference point for the output which might be high impedance enough to work with the same two resistors..

--

Rick C.

++-- Get 1,000 miles of free Supercharging
++-- Tesla referral code - https://ts.la/richard11209

 

[bitrex]

On 2/23/2022 2:50 PM, amdx wrote:

On 2/22/2022 8:39 PM, bitrex wrote:
On 2/22/2022 8:49 AM, amdx wrote:

Tragic. But your time is probably better spent keeping your shit
locked up, put up a fence, and not being such a busy-body.

One of the downsides of home ownership is that you can get stuck
with difficult neighbors for a long time, unlike with a lease where
the landlord often won\'t be of much more help than the police, but
in many states if a neighbor in your complex is routinely doing
disruptive/illegal shit next door you have entirely just cause to
bust the lease at that point and move on, perhaps at only the cost
of your security deposit, if that.

It\'s usually the best plan as a tenant-at-will rather than hope
anyone else will solve your problem for you.

The neighbor surveillance is mostly just a reason for a project, so
what if I can hear the chit chat for one and a half minutes,

that gets me nothing. I could have recorded video at least 10 times.
My wife is outside much more she has seen the hand off many

more time than I have.

Yes, assuming you could overhear a conversation, what are you hoping
to accomplish with the data is a question. You know they\'re doing
drugs there and someone\'s likely providing them. But at best none of
what you capture would ever be admissible as evidence in a court.

Don\'t see how the particulars are particularly meaningful other than
to confirm what you kinda already know.

Conversations among druggies tend to be remarkably boring.

OK, can we get over this. As I said, I saw the plans for the Shotgun
mic, 30 years ago, I thought it was neat. Somehow I saw

the plans posted again and thought, I could try it. I do not have a good
reason, other than I no longer need to hunt and gather food,

I have a roof over my head, I have excess income and I don\'t have to
work. So this looked like fun.

 I may not think so when I try to unsolder and solder in different
value 0402 resistors and capacitors on the TS472 pcb I have.

                                     Mikek

Say could you post those plans again? Was it the ones with all the
tubes? I was looking for that the other day also

 

[amdx]

On 2/23/2022 7:02 PM, bitrex wrote:

On 2/23/2022 2:50 PM, amdx wrote:
On 2/22/2022 8:39 PM, bitrex wrote:
On 2/22/2022 8:49 AM, amdx wrote:

Tragic. But your time is probably better spent keeping your shit
locked up, put up a fence, and not being such a busy-body.

One of the downsides of home ownership is that you can get stuck
with difficult neighbors for a long time, unlike with a lease
where the landlord often won\'t be of much more help than the
police, but in many states if a neighbor in your complex is
routinely doing disruptive/illegal shit next door you have
entirely just cause to bust the lease at that point and move on,
perhaps at only the cost of your security deposit, if that.

It\'s usually the best plan as a tenant-at-will rather than hope
anyone else will solve your problem for you.

The neighbor surveillance is mostly just a reason for a project, so
what if I can hear the chit chat for one and a half minutes,

that gets me nothing. I could have recorded video at least 10
times. My wife is outside much more she has seen the hand off many

more time than I have.

Yes, assuming you could overhear a conversation, what are you hoping
to accomplish with the data is a question. You know they\'re doing
drugs there and someone\'s likely providing them. But at best none of
what you capture would ever be admissible as evidence in a court.

Don\'t see how the particulars are particularly meaningful other than
to confirm what you kinda already know.

Conversations among druggies tend to be remarkably boring.

OK, can we get over this. As I said, I saw the plans for the Shotgun
mic, 30 years ago, I thought it was neat. Somehow I saw

the plans posted again and thought, I could try it. I do not have a
good reason, other than I no longer need to hunt and gather food,

I have a roof over my head, I have excess income and I don\'t have to
work. So this looked like fun.

  I may not think so when I try to unsolder and solder in different
value 0402 resistors and capacitors on the TS472 pcb I have.

                                      Mikek



Say could you post those plans again? Was it the ones with all the
tubes? I was looking for that the other day also

I think this was the original article, see page 51.

https://worldradiohistory.com/Archive-Poptronics/60s/64/Pop-1964-06.pdf
                                Mikek

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This email has been checked for viruses by Avast antivirus software.
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[amdx]

On 2/23/2022 7:17 PM, amdx wrote:

On 2/23/2022 7:02 PM, bitrex wrote:
On 2/23/2022 2:50 PM, amdx wrote:
On 2/22/2022 8:39 PM, bitrex wrote:
On 2/22/2022 8:49 AM, amdx wrote:

Tragic. But your time is probably better spent keeping your shit
locked up, put up a fence, and not being such a busy-body.

One of the downsides of home ownership is that you can get stuck
with difficult neighbors for a long time, unlike with a lease
where the landlord often won\'t be of much more help than the
police, but in many states if a neighbor in your complex is
routinely doing disruptive/illegal shit next door you have
entirely just cause to bust the lease at that point and move on,
perhaps at only the cost of your security deposit, if that.

It\'s usually the best plan as a tenant-at-will rather than hope
anyone else will solve your problem for you.

The neighbor surveillance is mostly just a reason for a project,
so what if I can hear the chit chat for one and a half minutes,

that gets me nothing. I could have recorded video at least 10
times. My wife is outside much more she has seen the hand off many

more time than I have.

Yes, assuming you could overhear a conversation, what are you
hoping to accomplish with the data is a question. You know they\'re
doing drugs there and someone\'s likely providing them. But at best
none of what you capture would ever be admissible as evidence in a
court.

Don\'t see how the particulars are particularly meaningful other
than to confirm what you kinda already know.

Conversations among druggies tend to be remarkably boring.

OK, can we get over this. As I said, I saw the plans for the Shotgun
mic, 30 years ago, I thought it was neat. Somehow I saw

the plans posted again and thought, I could try it. I do not have a
good reason, other than I no longer need to hunt and gather food,

I have a roof over my head, I have excess income and I don\'t have to
work. So this looked like fun.

  I may not think so when I try to unsolder and solder in different
value 0402 resistors and capacitors on the TS472 pcb I have.

                                      Mikek



Say could you post those plans again? Was it the ones with all the
tubes? I was looking for that the other day also

I think this was the original article, see page 51.

https://worldradiohistory.com/Archive-Poptronics/60s/64/Pop-1964-06.pdf
                                Mikek

 More,

> http://cdn.preterhuman.net/texts/government_information/intelligence_and_espionage/homebrew.military.and.espionage.electronics/servv89pn0aj.sn.sourcedns.com/_gbpprorg/mil/shotgun/index.html

                                             Mikek



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[bitrex]

On 2/23/2022 8:20 PM, amdx wrote:

On 2/23/2022 7:17 PM, amdx wrote:
On 2/23/2022 7:02 PM, bitrex wrote:
On 2/23/2022 2:50 PM, amdx wrote:
On 2/22/2022 8:39 PM, bitrex wrote:
On 2/22/2022 8:49 AM, amdx wrote:

Tragic. But your time is probably better spent keeping your shit
locked up, put up a fence, and not being such a busy-body.

One of the downsides of home ownership is that you can get stuck
with difficult neighbors for a long time, unlike with a lease
where the landlord often won\'t be of much more help than the
police, but in many states if a neighbor in your complex is
routinely doing disruptive/illegal shit next door you have
entirely just cause to bust the lease at that point and move on,
perhaps at only the cost of your security deposit, if that.

It\'s usually the best plan as a tenant-at-will rather than hope
anyone else will solve your problem for you.

The neighbor surveillance is mostly just a reason for a project,
so what if I can hear the chit chat for one and a half minutes,

that gets me nothing. I could have recorded video at least 10
times. My wife is outside much more she has seen the hand off many

more time than I have.

Yes, assuming you could overhear a conversation, what are you
hoping to accomplish with the data is a question. You know they\'re
doing drugs there and someone\'s likely providing them. But at best
none of what you capture would ever be admissible as evidence in a
court.

Don\'t see how the particulars are particularly meaningful other
than to confirm what you kinda already know.

Conversations among druggies tend to be remarkably boring.

OK, can we get over this. As I said, I saw the plans for the Shotgun
mic, 30 years ago, I thought it was neat. Somehow I saw

the plans posted again and thought, I could try it. I do not have a
good reason, other than I no longer need to hunt and gather food,

I have a roof over my head, I have excess income and I don\'t have to
work. So this looked like fun.

  I may not think so when I try to unsolder and solder in different
value 0402 resistors and capacitors on the TS472 pcb I have.

                                      Mikek



Say could you post those plans again? Was it the ones with all the
tubes? I was looking for that the other day also

I think this was the original article, see page 51.

https://worldradiohistory.com/Archive-Poptronics/60s/64/Pop-1964-06.pdf
                                Mikek

 More,

http://cdn.preterhuman.net/texts/government_information/intelligence_and_espionage/homebrew.military.and.espionage.electronics/servv89pn0aj.sn.sourcedns.com/_gbpprorg/mil/shotgun/index.html


                                             Mikek

Cool project. Explaining that one to TSA in the luggage would be
interesting, lol