Reply by Jan Panteltje●November 12, 20232023-11-12
On a sunny day (Sat, 11 Nov 2023 07:20:17 -0800) it happened John Larkin
<jl@997PotHill.com> wrote in <so6vki18mna03t03sfg0s6i2tfp4ulkcf1@4ax.com>:
>On Sat, 11 Nov 2023 05:41:10 GMT, Jan Panteltje <alien@comet.invalid>
>wrote:
>
>>On a sunny day (Fri, 10 Nov 2023 10:11:44 -0800) it happened john larkin
>><jl@650pot.com> wrote in <i9sski1c3big5ju6vanl09jkqeq04k7icu@4ax.com>:
>>
>>>On Thu, 09 Nov 2023 14:58:08 -0800, john larkin <jl@650pot.com> wrote:
>>>
>>>>On Wed, 8 Nov 2023 18:12:38 -0500, Phil Hobbs
>>>><pcdhSpamMeSenseless@electrooptical.net> wrote:
>>>>
>>>>>On 2023-11-08 18:08, Phil Hobbs wrote:
>>>>>> On 2023-11-08 14:04, john larkin wrote:
>>>>>>>
>>>>>>>
>>>>>>> https://www.amazon.com/Fluke-TL81A-Test-Deluxe-Electronic/dp/B000NI2B6A/ref=pd_lutyp_rtpb_sccl_2_1/142-3653234-3875240?pd_rd_w=8wX1f&content-id=amzn1.sym.9c90becd-3e6e-4609-85c5-d4298ba525ad&pf_rd_p=9c90becd-3e6e-4609-85c5-d4298ba525ad&pf_rd_r=W2VAXE
>>>>>>> FG
>>>>>>> 42ZY2RN15N9V&pd_rd_wg=Tc99b&pd_rd_r=eca67892-4420-4869-8d8e-145a23c7fb1f&pd_rd_i=B000NI2B6A&th=1
>>>>>>>
>>>>>>>
>>>>>>> Some of their handheld DVMs are over $400.
>>>>>>>
>>>>>>
>>>>>> I paid $275 for an original crispy flavor(*) Fluke 87 in about 1989.
>>>>>
>>>>>I should add that I'm very fond of these DMM probes:
>>>>>
>>>>><https://probemaster.com/8000-series-standard/>
>>>>>
>>>>>Cheers
>>>>>
>>>>>Phil Hobbs
>>>>
>>>>I was just probing a very tight board with a sewing needle.
>>>
>>>Imagine cutting the needle in two, splinting it back together but
>>>bridging the gap with a 950 ohm 0603 resistor, and soldering a coax
>>>center to the top end. You now have a tiny many-GHz 10:1 probe.
>>>
>>>At most signal levels, such probes don't need a ground.
>>
>>At decent signal levels probes do not need to connect either...
>
>DC coupling and amplitude calibration are sometimes nice.
>
>I've been toying with going into the probe business, fast stuff,
>passive resistive and active fet or equivalent. It wouldn't be hard.
Yes, at lower frequencies OK.
But at several GHz even sticking / touching a needle in the circuit will change everything
depending on needle length for example (part of wavelength, reflections etc).
Amplitude measurements OK at 50 Ohm output.
For DC on a RF point probe with high value resistor (several kOhm SMD) to a cheap meter with high input impedance...
Just whatever you encounter.
Sure an interesting project, could make some money.
I was testing earplugs, need really good ones playing while not freaking everybody out with mistakes I make...
The new Sennheiser sound terrible.. the very old ones are great
The new ones are 50 dollars or more I think,.... Do not even fit my ears.
So crap sells.
I did frequency sweeps to test the output of about 10 different earplugs I have laying about...
Oh man... some are like filters missing whole parts of the audio spectrum.
Could be fakes?
https://arstechnica.com/gadgets/2023/11/sparse-innards-of-25-counterfeit-airpods-pro-revealed-by-ct-scans/
I have not tested any Apple ones, have no Apple stuff, way too expensive. only have real apples and apple pies mmmm!
All those super HiFi things, whatever a fool likes to pay...
Reply by Anthony William Sloman●November 11, 20232023-11-11
On Sunday, November 12, 2023 at 2:21:01 AM UTC+11, John Larkin wrote:
> On Sat, 11 Nov 2023 05:41:10 GMT, Jan Panteltje <al...@comet.invalid>
> wrote:
> >On a sunny day (Fri, 10 Nov 2023 10:11:44 -0800) it happened john larkin
> ><j...@650pot.com> wrote in <i9sski1c3big5ju6v...@4ax.com>:
> >
> >>On Thu, 09 Nov 2023 14:58:08 -0800, john larkin <j...@650pot.com> wrote:
> >>
> >>>On Wed, 8 Nov 2023 18:12:38 -0500, Phil Hobbs
> >>><pcdhSpamM...@electrooptical.net> wrote:
> >>>
> >>>>On 2023-11-08 18:08, Phil Hobbs wrote:
> >>>>> On 2023-11-08 14:04, john larkin wrote:
> >>>>>>
> >>>>>> https://www.amazon.com/Fluke-TL81A-Test-Deluxe-Electronic/dp/B000NI2B6A/ref=pd_lutyp_rtpb_sccl_2_1/142-3653234-3875240?pd_rd_w=8wX1f&content-id=amzn1.sym.9c90becd-3e6e-4609-85c5-d4298ba525ad&pf_rd_p=9c90becd-3e6e-4609-85c5-d4298ba525ad&pf_rd_r=W2VAXEFG
> >>>>>> 42ZY2RN15N9V&pd_rd_wg=Tc99b&pd_rd_r=eca67892-4420-4869-8d8e-145a23c7fb1f&pd_rd_i=B000NI2B6A&th=1
> >>>>>>
> >>>>>>
> >>>>>> Some of their handheld DVMs are over $400.
> >>>>>>
> >>>>>
> >>>>> I paid $275 for an original crispy flavor(*) Fluke 87 in about 1989.
> >>>>
> >>>>I should add that I'm very fond of these DMM probes:
> >>>>
> >>>><https://probemaster.com/8000-series-standard/>
> >>>>
> >>>>Cheers
> >>>>
> >>>>Phil Hobbs
> >>>
> >>>I was just probing a very tight board with a sewing needle.
> >>
> >>Imagine cutting the needle in two, splinting it back together but
> >>bridging the gap with a 950 ohm 0603 resistor, and soldering a coax
> >>center to the top end. You now have a tiny many-GHz 10:1 probe.
> >>
> >>At most signal levels, such probes don't need a ground.
> >
> >At decent signal levels probes do not need to connect either...
>
> DC coupling and amplitude calibration are sometimes nice.
>
> I've been toying with going into the probe business, fast stuff, passive resistive and active fet or equivalent. It wouldn't be hard.
It might not look hard to John Larkin, who is happy to ignore the parallel capacitance of inductors. People who think more rigorously might see more potential problems.
--
Bill Sloman, Sydney
Reply by John Larkin●November 11, 20232023-11-11
On Sat, 11 Nov 2023 05:41:10 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
>On a sunny day (Fri, 10 Nov 2023 10:11:44 -0800) it happened john larkin
><jl@650pot.com> wrote in <i9sski1c3big5ju6vanl09jkqeq04k7icu@4ax.com>:
>
>>On Thu, 09 Nov 2023 14:58:08 -0800, john larkin <jl@650pot.com> wrote:
>>
>>>On Wed, 8 Nov 2023 18:12:38 -0500, Phil Hobbs
>>><pcdhSpamMeSenseless@electrooptical.net> wrote:
>>>
>>>>On 2023-11-08 18:08, Phil Hobbs wrote:
>>>>> On 2023-11-08 14:04, john larkin wrote:
>>>>>>
>>>>>> https://www.amazon.com/Fluke-TL81A-Test-Deluxe-Electronic/dp/B000NI2B6A/ref=pd_lutyp_rtpb_sccl_2_1/142-3653234-3875240?pd_rd_w=8wX1f&content-id=amzn1.sym.9c90becd-3e6e-4609-85c5-d4298ba525ad&pf_rd_p=9c90becd-3e6e-4609-85c5-d4298ba525ad&pf_rd_r=W2VAXEFG
>>>>>> 42ZY2RN15N9V&pd_rd_wg=Tc99b&pd_rd_r=eca67892-4420-4869-8d8e-145a23c7fb1f&pd_rd_i=B000NI2B6A&th=1
>>>>>>
>>>>>>
>>>>>> Some of their handheld DVMs are over $400.
>>>>>>
>>>>>
>>>>> I paid $275 for an original crispy flavor(*) Fluke 87 in about 1989.
>>>>
>>>>I should add that I'm very fond of these DMM probes:
>>>>
>>>><https://probemaster.com/8000-series-standard/>
>>>>
>>>>Cheers
>>>>
>>>>Phil Hobbs
>>>
>>>I was just probing a very tight board with a sewing needle.
>>
>>Imagine cutting the needle in two, splinting it back together but
>>bridging the gap with a 950 ohm 0603 resistor, and soldering a coax
>>center to the top end. You now have a tiny many-GHz 10:1 probe.
>>
>>At most signal levels, such probes don't need a ground.
>
>At decent signal levels probes do not need to connect either...
DC coupling and amplitude calibration are sometimes nice.
I've been toying with going into the probe business, fast stuff,
passive resistive and active fet or equivalent. It wouldn't be hard.
Reply by Jan Panteltje●November 11, 20232023-11-11
On a sunny day (Fri, 10 Nov 2023 10:11:44 -0800) it happened john larkin
<jl@650pot.com> wrote in <i9sski1c3big5ju6vanl09jkqeq04k7icu@4ax.com>:
>On Thu, 09 Nov 2023 14:58:08 -0800, john larkin <jl@650pot.com> wrote:
>
>>On Wed, 8 Nov 2023 18:12:38 -0500, Phil Hobbs
>><pcdhSpamMeSenseless@electrooptical.net> wrote:
>>
>>>On 2023-11-08 18:08, Phil Hobbs wrote:
>>>> On 2023-11-08 14:04, john larkin wrote:
>>>>>
>>>>> https://www.amazon.com/Fluke-TL81A-Test-Deluxe-Electronic/dp/B000NI2B6A/ref=pd_lutyp_rtpb_sccl_2_1/142-3653234-3875240?pd_rd_w=8wX1f&content-id=amzn1.sym.9c90becd-3e6e-4609-85c5-d4298ba525ad&pf_rd_p=9c90becd-3e6e-4609-85c5-d4298ba525ad&pf_rd_r=W2VAXEFG
>>>>> 42ZY2RN15N9V&pd_rd_wg=Tc99b&pd_rd_r=eca67892-4420-4869-8d8e-145a23c7fb1f&pd_rd_i=B000NI2B6A&th=1
>>>>>
>>>>>
>>>>> Some of their handheld DVMs are over $400.
>>>>>
>>>>
>>>> I paid $275 for an original crispy flavor(*) Fluke 87 in about 1989.
>>>
>>>I should add that I'm very fond of these DMM probes:
>>>
>>><https://probemaster.com/8000-series-standard/>
>>>
>>>Cheers
>>>
>>>Phil Hobbs
>>
>>I was just probing a very tight board with a sewing needle.
>
>Imagine cutting the needle in two, splinting it back together but
>bridging the gap with a 950 ohm 0603 resistor, and soldering a coax
>center to the top end. You now have a tiny many-GHz 10:1 probe.
>
>At most signal levels, such probes don't need a ground.
At decent signal levels probes do not need to connect either...
Reply by john larkin●November 10, 20232023-11-10
On Thu, 09 Nov 2023 14:58:08 -0800, john larkin <jl@650pot.com> wrote:
Imagine cutting the needle in two, splinting it back together but
bridging the gap with a 950 ohm 0603 resistor, and soldering a coax
center to the top end. You now have a tiny many-GHz 10:1 probe.
At most signal levels, such probes don't need a ground.
Reply by john larkin●November 10, 20232023-11-10
On Fri, 10 Nov 2023 17:53:09 +0000, liz@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:
>John Larkin <jl@997PotHill.com> wrote:
>
>> On Fri, 10 Nov 2023 15:31:44 +0000, Piglet <erichpwagner@hotmail.com>
>> wrote:
>>
>> >On 10/11/2023 03:44, Phil Hobbs wrote:
>> >> John Larkin <jl@997PotHill.com> wrote:
>> >>> On Thu, 9 Nov 2023 23:51:39 -0000 (UTC), Phil Hobbs
>> >>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>> >>>
>> >>>> john larkin <jl@650pot.com> wrote:
>> >>>>> On Wed, 8 Nov 2023 18:12:38 -0500, Phil Hobbs
>> >>>>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>> >>>>>
>> >>>>>> On 2023-11-08 18:08, Phil Hobbs wrote:
>> >>>>>>> On 2023-11-08 14:04, john larkin wrote:
>> >>>>>>>>
>> >>>>>>>>
>> >>>>>>>> Some of their handheld DVMs are over $400.
>> >>>>>>>>
>> >>>>>>>
>> >>>>>>> I paid $275 for an original crispy flavor(*) Fluke 87 in about 1989.
>> >>>>>>
>> >>>>>> I should add that I'm very fond of these DMM probes:
>> >>>>>>
>> >>>>>> <https://probemaster.com/8000-series-standard/>
>> >>>>>>
>> >>>>>> Cheers
>> >>>>>>
>> >>>>>> Phil Hobbs
>> >>>>>
>> >>>>> I was just probing a very tight board with a sewing needle.
>> >>>>>
>> >>>>>
>> >>>>
>> >>>> Darned board. ;)
>> >>>>
>> >>>> Phil Hobbs
>> >>>
>> >>> We could start a new thread.
>> >>
>> >> Pure fabrication.
>> >>
>> >> Cheers
>> >>
>> >> Phil Hobbs
>> >>
>> >
>> >You'll have me in stitches with these yarns.
>> >
>> >piglet
>>
>> What's your point?
>
>That's crewel !
Hey, don't pin me down.
Reply by Liz Tuddenham●November 10, 20232023-11-10
John Larkin <jl@997PotHill.com> wrote:
> On Fri, 10 Nov 2023 15:31:44 +0000, Piglet <erichpwagner@hotmail.com>
> wrote:
>
> >On 10/11/2023 03:44, Phil Hobbs wrote:
> >> John Larkin <jl@997PotHill.com> wrote:
> >>> On Thu, 9 Nov 2023 23:51:39 -0000 (UTC), Phil Hobbs
> >>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
> >>>
> >>>> john larkin <jl@650pot.com> wrote:
> >>>>> On Wed, 8 Nov 2023 18:12:38 -0500, Phil Hobbs
> >>>>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
> >>>>>
> >>>>>> On 2023-11-08 18:08, Phil Hobbs wrote:
> >>>>>>> On 2023-11-08 14:04, john larkin wrote:
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> Some of their handheld DVMs are over $400.
> >>>>>>>>
> >>>>>>>
> >>>>>>> I paid $275 for an original crispy flavor(*) Fluke 87 in about 1989.
> >>>>>>
> >>>>>> I should add that I'm very fond of these DMM probes:
> >>>>>>
> >>>>>> <https://probemaster.com/8000-series-standard/>
> >>>>>>
> >>>>>> Cheers
> >>>>>>
> >>>>>> Phil Hobbs
> >>>>>
> >>>>> I was just probing a very tight board with a sewing needle.
> >>>>>
> >>>>>
> >>>>
> >>>> Darned board. ;)
> >>>>
> >>>> Phil Hobbs
> >>>
> >>> We could start a new thread.
> >>
> >> Pure fabrication.
> >>
> >> Cheers
> >>
> >> Phil Hobbs
> >>
> >
> >You'll have me in stitches with these yarns.
> >
> >piglet
>
> What's your point?
That's crewel !
--
~ Liz Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk
It might unravel totally.
;)
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC /
Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics
Reply by John Larkin●November 10, 20232023-11-10
On Fri, 10 Nov 2023 15:31:44 +0000, Piglet <erichpwagner@hotmail.com>
wrote: