Andy's Postbag and random ebay links

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ahull
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Re: Andy's Postbag and random ebay links

Post by ahull » Wed Feb 07, 2018 4:54 pm

Good for light defrosting duties and zombie removal.
Would recommend.
Buyers who purchased this product also bought.
Satellite Launch system. Tesla Roadster.
Always read the safety instructions first.
;)

Aw.. drat.. Seller does not ship to the UK. :roll:
- Andy Hull -

zmemw16
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Re: Andy's Postbag and random ebay links

Post by zmemw16 » Sat Feb 10, 2018 1:12 pm


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ahull
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Re: Andy's Postbag and random ebay links

Post by ahull » Tue Feb 20, 2018 10:13 pm

The uber cheap moving coil meters I bought arrived.

Meter.JPG
Meter.JPG (105.01 KiB) Viewed 105 times
The resistor is 6.2kOhm (measures at 6.09kOhm)

Total resistance of meter incl. resistor= 6.31kOhm and FSD is 25V, so I=V/R so I calculate the current through the movement needed to get FSD to be
0.003961965A or around 4mA

Measured internal resistance of the meter alone (without the resistor) is 222 Ohms so assuming the current above is correct, FSD of the meter with no series resistor would be about 0.8V

I'll do some more accurate measurements when I get a chance.

The meter is extremely easy to hack, since it is held together with two small tabs of sellotape, and the thin plastic scale is held in with a small piece of double sided tape.

I've added two rulers for comparison, so I can create my own scales.I'll probably actually copy the existing scale with my flatbed scanner to get a more accurate outline.

This was the original listing, 5 panel meters (20V) for £1.42 shipped (£0.28p each)

https://www.ebay.co.uk/itm/0-20V-Analog ... 2749.l2649

MeterScale-1to1.jpg
MeterScale-1to1.jpg (28.69 KiB) Viewed 105 times
Scale 1:1 scale. Width 2.8cm approx

MeterScale-1to1-3V.jpg
MeterScale-1to1-3V.jpg (20.87 KiB) Viewed 100 times
Example meter scale created from the previous image.
- Andy Hull -

zmemw16
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Re: Andy's Postbag and random ebay links

Post by zmemw16 » Tue Feb 20, 2018 11:37 pm

picture hasn't :)
looked at the ebay link, last time i saw something like that was in a Henry's Radio advert, Practical Electronics/Wireless
or similar. Edgeware Rd, what was that road in Soho also with lots of electronics shops ? always to over explain my visiting it :lol:
srp

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ahull
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Re: Andy's Postbag and random ebay links

Post by ahull » Tue Feb 20, 2018 11:58 pm

zmemw16 wrote:
Tue Feb 20, 2018 11:37 pm
picture hasn't :)
looked at the ebay link, last time i saw something like that was in a Henry's Radio advert, Practical Electronics/Wireless
or similar. Edgeware Rd, what was that road in Soho also with lots of electronics shops ? always to over explain my visiting it :lol:
srp
Picture fixed.
I used to frequent a couple of surplus shops in Glasgow and one in Edinburgh, now all long gone, sadly.
I'll bet even then, you couldn't get a panel meter movement for 0.28p - New.. shipped.

I also visited Edgeware road "back in the day". I'm trying to remember the names of the electronic shops that were there.
So far as I recall, that was where I picked up my old, "new stock" Acorn Electron, long after they had gone out of production.
- Andy Hull -

zmemw16
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Re: Andy's Postbag and random ebay links

Post by zmemw16 » Wed Feb 21, 2018 5:42 am

henry's radio i think was 303, that number just popped in, at least another one across the road and a far-east low price box shifter a couple of doors away.
somewhere back towards the underground and across the road was a semi-decent bookshop and something extra south of the cross-roads.
i vaguely remember the cop shop being across the station.
stephen

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ahull
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Re: Andy's Postbag and random ebay links

Post by ahull » Wed Feb 21, 2018 9:52 am

zmemw16 wrote:
Wed Feb 21, 2018 5:42 am
... and something extra south of the cross-roads....
There was quite a lot of "extra" stuff going on in that neck of the woods back in the seventies and eighties, just at the other end of Bond St, or so I'm told :P , which would explain the need for the cop shop. :o
Its all been "gentrified" recently I believe.
- Andy Hull -

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ahull
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Re: Andy's Postbag and random ebay links

Post by ahull » Wed Feb 21, 2018 12:35 pm

Here is what you get for your twenty eight pence.
15V-MeterMechanism.jpg
15V-MeterMechanism.jpg (50.08 KiB) Viewed 57 times
The mechanism is easily extracted from the case with a small pair of long nosed pliers. It is a friction fit, so no glue or tabs need to be dealt with. The resistor is conveniently soldered to two tabs, so easily replaced with something more suited to whatever application you can think of. The zero adjust appears to have a small blob of magnolia emulsion locking it. :lol:

And here is my first practical use of the meter..

I bring you the Brexitometer(tm)
BrexitometerSmall.jpg
BrexitometerSmall.jpg (78.71 KiB) Viewed 57 times
I've had it sat in front of Radio 4 all morning listening to all sorts of opinions being spouted on the subject of Brexit, and the needle hasn't budged, so it must be working. :P
- Andy Hull -

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BennehBoy
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Re: Andy's Postbag and random ebay links

Post by BennehBoy » Wed Feb 21, 2018 1:12 pm

:lol: :lol: :lol:
-------------------------------------
https://github.com/BennehBoy

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zoomx
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Re: Andy's Postbag and random ebay links

Post by zoomx » Thu Feb 22, 2018 6:27 pm

:lol:

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