Author Topic: What did we do today?  (Read 13357 times)

SeanB

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What did we do today?
« on: January 13, 2016, 01:09:31 PM »
Thought I might start a general thread, what you dod today that you thought might be interesting to all.

To start it, today I was rewinding some relay coils, to change them from a standard 24VAC coil to a slightly non standard 36VAC coil, as the original coils and contactors are a 3 month delay on the slow boat from China, and are the same poor quality. Steel contacts and steel terminals, not exactly the beast.

So, bought some GE contactors, made in Poland, and unwound the one to get the turns count ( 522) and rewound it with 850 turns of a slightly thinner wire ( so as to still fit the former) that I ordered from RS Components as part of a larger order. Naturally, being RS, 3 out of the 4 are ex UK stock, and will be here next week. The wire was the only item in stock locally, so was next day, even before the payment cleared. So, spent a pleasant 2 hours unwinding and rewinding 2 coils, multitasking doing so as receptionist. 5 calls in that time, lucky I had a pen and paper to use as a counter. Cleaned the wire ends with some sandpaper and soldered them to the terminals, and put them in and they work, 7VA power consumption.

Now, what to do with 1km of 0.224mm wire, still have 30km of 0.5mm wire that has been around a long time, but too big to use here.

RobertoLG

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Re: What did we do today?
« Reply #1 on: January 14, 2016, 05:03:56 PM »
Oldie and newie  ;D   thanks man!!!

SeanB

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Re: What did we do today?
« Reply #2 on: January 23, 2016, 06:31:17 AM »
Bought a sale LED backlit monitor for $15 at the local China mall, on sale because it is missing the power supply and remote. 1366 by 768 40cm panel, and it works. Sold as a TV set, but I plan to use it as a monitor, as it has HDMI, VGA and RCA inputs as well. Branded TEAC, but could be anything under the case. Just tried it with a generic 12V 2A wall wart, and it seems to function, though I did not apply any signals to it yet.

Mr Eastwood

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Re: What did we do today?
« Reply #3 on: January 26, 2016, 05:40:06 AM »
I'm going to give my new PICKIT3 a try tonight;  I never use MPLAB IDE as I think it's a very poor and confusing IDE,  so I just throw my source code files at the compiler and out comes a hex file to flash onto my chips;  the good thing about that is you learn more about the compiler and chips than you would if you let your IDE do it all for you.
Hey! Frisbee! Far out!

Mr Eastwood

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Re: What did we do today?
« Reply #4 on: March 27, 2016, 07:32:31 AM »
I returned back to a project I'd started a while ago on one of my breadboards as I want to get it finished up and out the way;  it's a circuit that reads some car sensor signals and displays them on a lcd and you can use a rotary switch to "page" through the various sensors readings etc.   I hit a brick wall a while back because I rather stupidly choose to mux all my adc signals as I needed more inputs than I had adc lines on my PIC;  so with fresh eyes last night I took a look and it turned out to be simple! all i needed was stronger pulldown on my 2 buttons which were being mux'd through a  CD4053;   hobby electronics can be cruel sometimes! lol

Hey! Frisbee! Far out!

SeanB

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Re: What did we do today?
« Reply #5 on: November 20, 2016, 10:18:49 AM »
Well, making some scrap metal, and doing data erasure on old hard drives. Started with a big box of assorted drives, and now have a pile of mostly aluminium parts and another box of stainless steel covers and screws.

Now have a big pile of crescent shaped neodymium magnets on pole pieces to play with, along with a number of aluminium platters to bend.  Some have had the data literally scrubbed off by the damaged heads, which makes a lovely grinding paste inside the drive.

Sizes ranged from 40G to 3T on them, majority 80G and 500G.

PoBoySolar

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Re: What did we do today?
« Reply #6 on: November 23, 2016, 01:53:25 PM »
Precision standards are not something I use everyday. For most things close is good enough.  I wanted to experiment with building a low noise voltage reference.  So I have fired up some things that don't get powered often.  Trying to figure out what is stable and what can be believed. Been comparing readings and what seems to track together.  Like the old saying......One clock in town, everyone knows what time it is.

PoBoySolar

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Re: What did we do today?
« Reply #7 on: November 24, 2016, 03:09:43 PM »
Today I dug out another Dial A Source DAS-56A and now I have at least two things that somewhat agree. Found a Fluke 8520A I didn't know I even had.  Powered it up and a 15 ohm resistor flamed out, shorted tantalum on a 27V buss. It still had the mark of the devil on the display, 66666.  Still looking for
the differential voltmeter.

Mr Eastwood

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Re: What did we do today?
« Reply #8 on: November 24, 2016, 05:18:27 PM »
lol sorry, I had to delete my previous post as I was going to add some text waffle about what I had been doing, but then had to do something else, and when I came back,  I forgot I had attached a picture.
Hey! Frisbee! Far out!

Mr Eastwood

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Re: What did we do today?
« Reply #9 on: November 24, 2016, 05:21:00 PM »
It still had the mark of the devil on the display, 66666.

lol
Hey! Frisbee! Far out!

TechJunkie

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Re: What did we do today?
« Reply #10 on: December 19, 2016, 04:40:04 PM »

Now have a big pile of crescent shaped neodymium magnets on pole pieces to play with, along with a number of aluminium platters to bend.  Some have had the data literally scrubbed off by the damaged heads, which makes a lovely grinding paste inside the drive.


I quit scrapping hd's, the return on the aluminium was not worth the time. However, I still salvage the neo's although they are not nearly as good as the neo's in the late 80's early 90's drives! I think those neo's are worth more than the scrap! :)
Eric Haney
Systems Programmer, EE, MCSE, DMC
SilverCore Labs

SeanB

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Re: What did we do today?
« Reply #11 on: December 20, 2016, 10:57:25 PM »
Got the magnets off the pole pieces eventually, by soaking for the last 2 weeks in a jar filled with methyl ethyl ketone solvent, to dissolve the adhesive sticking them on to the pole plates. now have a tower on the fridge door, amd the last few holdouts soaking in the bath of solvent. Some came off easy, but the stubborn ones took a while, as i did not want to break any, and only broke a single thin one.

Magnetic indicator film comes in  handy though to show you how the field inside is arranged, some are not just a single pole on each side, but a pair of poles with a common centre.

Yes, the amount of money for the scrap is not much, but I had a lot of extra scrap to go with it. There was only 6kg of aluminium and steel in the 20 odd drives.

mcinque

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Re: What did we do today?
« Reply #12 on: December 29, 2016, 10:14:42 AM »
So, bought some GE contactors, made in Poland, and unwound the one to get the turns count ( 522) and rewound it with 850 turns of a slightly thinner wire ( so as to still fit the former) that I ordered from RS Components as part of a larger order.

How do you calculate the turns?

SeanB

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Re: What did we do today?
« Reply #13 on: December 29, 2016, 12:41:39 PM »
Wound till the former was full, like the rest of the coils.

PoBoySolar

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Re: What did we do today?
« Reply #14 on: December 31, 2016, 03:42:25 PM »
I have to leave town next week. Have a friend that is going to feed the dog. I decided build an automatic water bowl.The white tube on the bowl is the overflow which goes to a floor drain in the basement where the dog door is.  The black tube is the fill line going to an old washer solenoid valve. I knew if I waited long enough I would find a use for this. The other valve has to be capped or else it would leak. These valves have to have positive pressure on the inlet to seal. When filling, this valve jolts like a rocket. I had to put
a small sponge inside the inlet port to slow down the flow.

I was visiting a friends shop two weeks ago when I saw some capitol equipment waiting to go to scrap and grabbed two of these plug in dual event timers.  It just so happens that I used to work for the company that made these timers and they are micro processor based, set up from 1 second to 100 hours.  So it is like I built this.  I operate the valve for five seconds every hour. Any overflow goes out the white tube down the drain keeping the water fresh. A spare set of relay contacts resets the timer and the process starts over.