Author Topic: EEVblog #1013 - Mailbag  (Read 1285 times)

0 Members and 1 Guest are viewing this topic.

Offline EEVblog

  • Administrator
  • *****
  • Posts: 24005
  • Country: au
    • EEVblog
EEVblog #1013 - Mailbag
« on: August 07, 2017, 11:30:00 AM »
Monster 45min Mailbag!




SPOILERS:
The Current Source Channel: http://www.youtube.com/channel/UCw0U6DtO0PHb3l37eKEAdSg
Analog meters + VTVM's + Dave's first multimeter.
Laser Cut Parts: http://www.cnc-design.fi/wp/
Images Of Silicon Valley: http://amzn.to/2vaKqZk
Brady label maker teardown
SushiBits M193v2 Arduino PCB
2DW233 Voltage Reference Zener
http://www.eevblog.com/forum/metrology/ultra-low-noise-reference-2dw232-2dw233-2dw23x/
Fitbit Teardown
i-Extruder Solder Paste Dispenser: https://www.i-extruder.com/en/
University of Bristol UB20M Zero Power Standby chip
http://www.bristol.ac.uk/engineering/research/em/research/zero-standby-power/
Silego Reset IC: http://www.silego.com/applications/reset-ic.html

 

Offline boffin

  • Supporter
  • ****
  • Posts: 465
  • Country: ca
Re: EEVblog #1013 - Mailbag
« Reply #1 on: August 07, 2017, 12:40:02 PM »
Could the jtag issue have anything to do with this? Looks like a solder bridge in the video

As for the 'corner' multimeter. It has exactly the same style of jacks and writing on the range select switch as an RS  - It was Japanese re-branded one, I think the company was something like "Ross" -- meter that was my 1st meter.
« Last Edit: August 07, 2017, 01:07:19 PM by boffin »
 

Online bjcuizon

  • Regular Contributor
  • *
  • Posts: 129
  • Country: nz
  • RF and Analog Electronics Enthusiast
Re: EEVblog #1013 - Mailbag
« Reply #2 on: August 07, 2017, 02:53:39 PM »
The connector on your VTVM is a Switchcraft 2501F Microphone Connector.-Go figure. It is some really old school mic connector. I love how it does not have a pin nor a socket. Its like an ancient version of the APC-7 Connector.
https://www.google.co.nz/search?q=Switchcraft+2501F+Microphone+Connector&rlz=1C1RLNS_enNZ746NZ746&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjTtJ61qcTVAhWMnJQKHVVrDv8Q_AUICigB&biw=1029&bih=694#imgrc=_
« Last Edit: August 07, 2017, 03:14:56 PM by bjcuizon »
Don't mess with an Electronics Engineer, it Megahertz!
 
The following users thanked this post: Bud

Online wilfred

  • Super Contributor
  • ***
  • Posts: 4274
  • Country: au
Re: EEVblog #1013 - Mailbag
« Reply #3 on: August 07, 2017, 03:21:31 PM »
Anyone else thinking that Mr Carlson's Lab might breath new life into that VTVM?

For the history book readers. I'm reading "Scorched Earth" by Sue Rosen which is about the Secret Australian Goverment plan developed in the wake of the Japanese attack on Pearl Harbour. The plan was to quickly mobilise the citizens to repel any invasion of Australia. To get them to deny vital resources to the enemy in what would be a logistical nightmare to transit an invasion force across this vast continent from the north.  I haven't read enough to make a recommendation. So far it is an interesting window into a different time.

https://www.allenandunwin.com/browse/books/general-books/history/Scorched-Earth-Sue-Rosen-9781925575149

If your history book reading doesn't deviate from the technical then this free PDF download about CSIRAC: Australia's first computer might suit.
http://www.cis.unimelb.edu.au/about/csirac/the-last-of-the-first-csirac-ebook.pdf
« Last Edit: August 07, 2017, 03:24:44 PM by wilfred »
 

Online bjcuizon

  • Regular Contributor
  • *
  • Posts: 129
  • Country: nz
  • RF and Analog Electronics Enthusiast
Re: EEVblog #1013 - Mailbag
« Reply #4 on: August 07, 2017, 03:37:11 PM »
Anyone else thinking that Mr Carlson's Lab might breath new life into that VTVM?
Yup! Absolutely. :) ;D hehe.
Don't mess with an Electronics Engineer, it Megahertz!
 

Offline technix

  • Super Contributor
  • ***
  • Posts: 1738
  • Country: cn
  • From Shanghai With Love
    • My Untitled Blog
Re: EEVblog #1013 - Mailbag
« Reply #5 on: August 07, 2017, 08:48:14 PM »
Could the jtag issue have anything to do with this? Looks like a solder bridge in the video
No it is not the culprit. And it is not a solder bridge either.
 

Offline coppice

  • Super Contributor
  • ***
  • Posts: 2525
  • Country: hk
Re: EEVblog #1013 - Mailbag
« Reply #6 on: August 07, 2017, 11:35:46 PM »
The connector on your VTVM is a Switchcraft 2501F Microphone Connector.-Go figure. It is some really old school mic connector. I love how it does not have a pin nor a socket. Its like an ancient version of the APC-7 Connector.
Quite a lot of low cost test equipment, especially from Japan, used that connector in the late 60s and early 70s.
 

Offline kalel

  • Frequent Contributor
  • **
  • Posts: 412
  • Country: 00
Re: EEVblog #1013 - Mailbag
« Reply #7 on: August 07, 2017, 11:38:10 PM »
Anyone else thinking that Mr Carlson's Lab might breath new life into that VTVM?
Yup! Absolutely. :) ;D hehe.

Would make a suitable addition to the channel. :)
 

Offline coppice

  • Super Contributor
  • ***
  • Posts: 2525
  • Country: hk
Re: EEVblog #1013 - Mailbag
« Reply #8 on: August 07, 2017, 11:38:44 PM »
The multimeter at 41:05 was widely available in the UK in the late 60s/early 70s with two or three different brand names on it. My father had one. It was a great value for money little meter, compact, robust and accurate.
 

Offline M4trix

  • Regular Contributor
  • *
  • Posts: 213
  • Country: hr
Re: EEVblog #1013 - Mailbag
« Reply #9 on: August 08, 2017, 08:56:51 AM »
Looks like the I-EXTRUDER dispenser isn't very happy !  ;D

 

Online bjcuizon

  • Regular Contributor
  • *
  • Posts: 129
  • Country: nz
  • RF and Analog Electronics Enthusiast
Re: EEVblog #1013 - Mailbag
« Reply #10 on: August 08, 2017, 10:26:25 AM »
The connector on your VTVM is a Switchcraft 2501F Microphone Connector.-Go figure. It is some really old school mic connector. I love how it does not have a pin nor a socket. Its like an ancient version of the APC-7 Connector.
Quite a lot of low cost test equipment, especially from Japan, used that connector in the late 60s and early 70s.
Why do they not use standard binding posts since binding posts have been here for a long time..maybe since 1905ish.

They also even use that mic connector in early RF gear. I wonder what its frequency capability is... Does anyone know?
« Last Edit: August 08, 2017, 02:43:57 PM by bjcuizon »
Don't mess with an Electronics Engineer, it Megahertz!
 

Online Cerebus

  • Super Contributor
  • ***
  • Posts: 1338
  • Country: gb
Re: EEVblog #1013 - Mailbag
« Reply #11 on: August 09, 2017, 02:28:23 AM »
The connector on your VTVM is a Switchcraft 2501F Microphone Connector.-Go figure.

Back in the 70s the band I was playing in then inherited a couple of electret microphones that had those Switchcraft connectors on. They made lousy microphone connectors and I have no reason to believe that they'd make better test equipment connectors. They were forever developing intermittent connections on the centre conductor because of flexing from poor strain relief.
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 

Offline coppice

  • Super Contributor
  • ***
  • Posts: 2525
  • Country: hk
Re: EEVblog #1013 - Mailbag
« Reply #12 on: August 09, 2017, 03:19:10 AM »
The connector on your VTVM is a Switchcraft 2501F Microphone Connector.-Go figure.

Back in the 70s the band I was playing in then inherited a couple of electret microphones that had those Switchcraft connectors on. They made lousy microphone connectors and I have no reason to believe that they'd make better test equipment connectors. They were forever developing intermittent connections on the centre conductor because of flexing from poor strain relief.
I had an audio generator and an RF generator in the 70s with those connectors for the outputs. They look crude, but they never gave me any problems. The instruments were from a small Japanese maker which was popular in the UK in the 70s (sold by Henry's Radio, GW Smith, and others), but I've forgotten their name.
 

Online Cerebus

  • Super Contributor
  • ***
  • Posts: 1338
  • Country: gb
Re: EEVblog #1013 - Mailbag
« Reply #13 on: August 09, 2017, 03:28:21 AM »
I had an audio generator and an RF generator in the 70s with those connectors for the outputs. They look crude, but they never gave me any problems. The instruments were from a small Japanese maker which was popular in the UK in the 70s (sold by Henry's Radio, GW Smith, and others), but I've forgotten their name.

Altai ?
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 

Online Brumby

  • Supporter
  • ****
  • Posts: 4839
  • Country: au
Re: EEVblog #1013 - Mailbag
« Reply #14 on: August 09, 2017, 03:33:31 AM »
Microphones tend to have more cable movement with their use than test equipment - both in flexing cycles and intensity .... and also a lot less care.

It's like comparing the state of a cake after having been sent via the Post with one you carried yourself.
 

Online Cerebus

  • Super Contributor
  • ***
  • Posts: 1338
  • Country: gb
Re: EEVblog #1013 - Mailbag
« Reply #15 on: August 09, 2017, 04:52:37 AM »
Microphones tend to have more cable movement with their use than test equipment - both in flexing cycles and intensity .... and also a lot less care.

It's like comparing the state of a cake after having been sent via the Post with one you carried yourself.

That simile only holds if the cake is advertised as "postal cake", remember these were sold as "microphone connectors".
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 

Online Brumby

  • Supporter
  • ****
  • Posts: 4839
  • Country: au
Re: EEVblog #1013 - Mailbag
« Reply #16 on: August 09, 2017, 01:33:00 PM »
Fair comment ... but then, from my observation, the dynamic loads those connectors have been subject to have increased somewhat over the years since they were first introduced as such.

They were created in the earlier developing period of electronics where equipment was generally treated with more care.
 

Offline jh15

  • Frequent Contributor
  • **
  • Posts: 333
  • Country: us
Re: EEVblog #1013 - Mailbag
« Reply #17 on: August 09, 2017, 03:48:57 PM »
Fully shielded  unbalanced coax vs banana rf exposed wires.
tek 575 curve tracer top shape, 535 top shape, 465. 545 hickok clone, Telsa Model S P60 Ohio Scientific c24P single board computer, many c-64 from my club days, Giant electric bicycle, Rigol stuff, Heathkit AR-15 receivers 2, Heathkit et 3400a trainer and interface,
 

Offline Len

  • Frequent Contributor
  • **
  • Posts: 507
  • Country: ca
Re: EEVblog #1013 - Mailbag
« Reply #18 on: August 17, 2017, 10:22:36 AM »
In case anyone needs it...
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf

 

http://opalkelly.com/