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Messages - station240

Pages: [1]
1
General Chat / Re: Little Bee B Field / Current Probe
« on: July 13, 2020, 01:08:35 PM »
This would have been really handy for debugging this PCB I designed.
Some sort of weird design issue, I 'solved' by removing that part of the circuit entirely.

2
Lets just hope the Internet Archive (host of the wayback machine) manages to stay in business:

https://arstechnica.com/tech-policy/2020/06/publishers-sue-internet-archive-over-massive-digital-lending-program/

Ugh, legally the publishers have a strong case, morally and ethically they should abandon the law suit.
If this was say a national library doing the same thing, the publishers wouldn't even consider a lawsuit.

The Internet Archive is the only copy of some former websites, and other defunct digital content.
It should be protected in law, but it isn't.
If we didn't have a bunch of technophobes and cynical old men in government, the IA would have the protection it needs.

3
Transformer (Ferrite Core) / Re: GDT cable specs
« on: May 24, 2020, 09:55:49 PM »
Cat6 just has that plus (+) shaped plastic filler in the middle to keep the 4 pairs a set distance apart.

4
Electronic Circuits / Re: Cost reduction in consumer electrics
« on: January 03, 2020, 09:57:56 AM »
I've seen toaster ovens with short lengths of solid wire welded between adjacent elements.
But never that extensive, or over longer distances.

Also seen spade terminals welded to heating elements, at right angles so you can't just slide the element out.

5
Electronic Circuits / Re: Isolated Series Li-ion Charger
« on: December 23, 2018, 12:59:50 PM »
You can get tp5000 modules off ebay too, higher efficiency and charge at 2A by default.

6
General Chat / Re: Garden flag pole hit by lightning
« on: October 17, 2018, 05:48:06 PM »
Looks like a fibreglass pole to me, the only metal part would be the base.

I've seen lightning strike a power pole directly.
Scored a direct hit on a 66kV overhead line, then took off in the direction of the substation.
It's arrival being shown as a brief wispy smoke cloud hanging over the station.
I called the power company, they were worried, they sent a helicopter!
Power was restored soon after.

Went past later to see what they had fixed.
The lightning had jumped from the 66kV cable into the 11kV switch yard.
A small transformer had two brand new fuses, it powers all the control and switching systems.

So where did the smoke come from ?
Yeah they found out 2 weeks later all 3 brand new underground 11kV cables had been damaged, and needed the first 50M of each dug up and replaced.

7
Electronic Circuits / Re: Offgrid 48V solar to 24V battery setup
« on: October 16, 2018, 02:57:07 PM »
Victron have not unreasonable pricing
https://www.victronenergy.com/solar-charge-controllers

I rewrote the instructions at the top of the page to be clearer.

In our MPPT model names,  the first number is the maximum PV open circuit voltage. The second number is the maximum charge current.
For example MPPT 75/50, maximum PV open circuit voltage 75V.  maximum charge current 50A.

8
Printed Circuit Board / Re: looking for PCB creating software
« on: October 16, 2018, 01:56:34 PM »
has anybody tried designspark

https://www.rs-online.com/designspark/pcb-software

Been using DesignSpark for about a year now, as a replacement for Eagle after the buy out broke a lot of my libraries.
Use it with Library Loader, which is part component database website, part conversion software.

Free + no limitations for what I'm doing with it.

One neat trick I only just found, you can copy paste whole PCB designs between projects. So no need for panelization software.

9
Electronic Circuits / Re: Eaton PowerWare 20 kVA UPS teardown
« on: October 16, 2018, 08:52:36 AM »
You got quite of lot of re-usable parts out of this one Mads.
Shame about the terminal blocks getting busted up, still could be worse.

Out of interest, do you just give any wiring/cables you don't need to the junkyard, or just toss it back into the cabinet ?

10
Posted a link to this on EEVBlog forum, forgot to post it here too.

Found this video from Kevin Gittemeier
Yes the magic smoke did escape, from several places.
Rather interesting how cheaply made an elevator drive VFD can be.

11
I wonder how poor the power factor is ?
Is the small bus capacitor so it's recharged every mains cycle.

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