Author Topic: EEVblog #1013 - Mailbag  (Read 8277 times)

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Offline EEVblogTopic starter

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EEVblog #1013 - Mailbag
« on: August 07, 2017, 01:30:00 am »
Monster 45min Mailbag!




SPOILERS:
The Current Source Channel: https://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
https://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

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Re: EEVblog #1013 - Mailbag
« Reply #1 on: August 07, 2017, 02:40:02 am »
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, 03:07:19 am by boffin »
 

Offline bjcuizon

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Re: EEVblog #1013 - Mailbag
« Reply #2 on: August 07, 2017, 04:53:39 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.
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, 05:14:56 am by bjcuizon »
Don't mess with an Electronics Engineer, it Megahertz!
 
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Offline bjcuizon

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Re: EEVblog #1013 - Mailbag
« Reply #3 on: August 07, 2017, 05:37:11 am »
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

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Re: EEVblog #1013 - Mailbag
« Reply #4 on: August 07, 2017, 10:48:14 am »
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

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Re: EEVblog #1013 - Mailbag
« Reply #5 on: August 07, 2017, 01:35:46 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

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Re: EEVblog #1013 - Mailbag
« Reply #6 on: August 07, 2017, 01:38:10 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

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Re: EEVblog #1013 - Mailbag
« Reply #7 on: August 07, 2017, 01:38:44 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

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Re: EEVblog #1013 - Mailbag
« Reply #8 on: August 07, 2017, 10:56:51 pm »
Looks like the I-EXTRUDER dispenser isn't very happy !  ;D

 

Offline bjcuizon

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Re: EEVblog #1013 - Mailbag
« Reply #9 on: August 08, 2017, 12:26:25 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, 04:43:57 am by bjcuizon »
Don't mess with an Electronics Engineer, it Megahertz!
 

Offline Cerebus

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Re: EEVblog #1013 - Mailbag
« Reply #10 on: August 08, 2017, 04:28:23 pm »
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

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Re: EEVblog #1013 - Mailbag
« Reply #11 on: August 08, 2017, 05:19:10 pm »
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.
 

Offline Cerebus

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Re: EEVblog #1013 - Mailbag
« Reply #12 on: August 08, 2017, 05:28:21 pm »
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

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Re: EEVblog #1013 - Mailbag
« Reply #13 on: August 08, 2017, 05:33:31 pm »
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.
 

Offline Cerebus

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Re: EEVblog #1013 - Mailbag
« Reply #14 on: August 08, 2017, 06:52:37 pm »
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

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Re: EEVblog #1013 - Mailbag
« Reply #15 on: August 09, 2017, 03:33:00 am »
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

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Re: EEVblog #1013 - Mailbag
« Reply #16 on: August 09, 2017, 05:48:57 am »
Fully shielded  unbalanced coax vs banana rf exposed wires.
Tek 575 curve trcr top shape, Tek 535, Tek 465. Tek 545 Hickok clone, Tesla Model S,  Ohio Scientific c24P SBC, c-64's from club days, Giant electric bicycle, Rigol stuff, Heathkit AR-15's. Heathkit ET- 3400a trainer&interface. Starlink pizza.
 

Offline Len

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Re: EEVblog #1013 - Mailbag
« Reply #17 on: August 17, 2017, 12:22:36 am »
In case anyone needs it...
DIY Eurorack Synth: https://lenp.net/synth/
 


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