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Chubb combination lock fail

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ratlock

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Post Wed Apr 19, 2017 4:56 pm

Re: Chubb combination lock fail

I thought Id put a little bit about the microphone ive been playing with to see what others are using. See if improvements can be made.

I started with a 50mm pizo mic from local electrical parts shop (maplin) £1.99, a 1/4 inch jack socket £1.99 a magnet from ebay, and a bit off an old latch for a handle.

The Second Mic I made has turned out better. Instead of glueing the mic straight on to the magnet, I glued a 48mm rubber O ring on first, then glued the mic onto the O ring.

I also ran the cables up through the middle of the magnet, instead of around the outside.

This second version is working much better.

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ratlock

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Post Mon Apr 24, 2017 6:02 pm

Re: Chubb combination lock fail

Here is an other idea Im going to try out. As well as needing a mic to hear whats going on I need some visual help too.

Here is a £10 microcscope/viewer off ebay that plugs straight into the computer. Its a bit fiddly to get going, but once its focused and set up, its ok for a tenner.

Another problem I had staring at one space in a dial, over and over again, was "is that 4 and a quarter" or "two fifths" or was it bigger last time. After a while i somtimes doubt my own jugement.

I thought id make it a little less subjective, by adding a piece of tipex correction tape on the space between left, and right contact. Then with a fine coloured pen. Mark one line red, and one line green. Green closest together on left, and right contacts.

That way in the first quarter of a space you have black, black/red, red, red/green, green.

I have marked a graph with the colours in the right places too. It helped me be more accurate as I plotted along, less subjective than 4 and a bit. 96 and a bit less.


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femurat

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Post Mon Apr 24, 2017 9:48 pm

Re: Chubb combination lock fail

ratlock wrote:Another problem I had staring at one space in a dial, over and over again, was "is that 4 and a quarter" or "two fifths" or was it bigger last time. After a while i somtimes doubt my own jugement.


Using colored lines is very creative. A more traditional method is a vernier scale. You have no idea how useful it is until you try it. There's a site that helps you make it http://analoghacking.com/vernier.html

Cheers :)
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ratlock

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Post Tue Apr 25, 2017 6:07 am

Re: Chubb combination lock fail

Thanks very much for the link Femurat. Tried to open the program, and antivirus software says there is a virus in the program, and wont let me open it.
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femurat

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Post Tue Apr 25, 2017 7:01 am

Re: Chubb combination lock fail

I have it on the office pc and never had a problem. Now my isp is marking the website as potentially harmful. Maybe they don't like the word hack in the url.
Tell me size and numbers of the dials you have and I'll send you a pdf tomorrow.

Cheers :)
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MartinHewitt

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Post Tue Apr 25, 2017 12:32 pm

Re: Chubb combination lock fail

ratlock wrote:Here is an other idea Im going to try out. As well as needing a mic to hear whats going on I need some visual help too.

Here is a £10 microcscope/viewer off ebay that plugs straight into the computer. Its a bit fiddly to get going, but once its focused and set up, its ok for a tenner.

You really are a toolman!
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ratlock

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Post Thu Apr 27, 2017 5:34 pm

Re: Chubb combination lock fail

Ive been having a play with things that make things easier for me to use, when manipulating wheel locks.
This little gizmo I can really reccomend. The Vox Amplug.

I bought 2 second hand off ebay. One Bass, and one metal. The guys out there who know more than me about the musical merits of both, will know more about them.

I tried both, and the metal one really is the cats whiskers when listening to every tiny movement.

Although its a contact mic, and as such should only hear direct sound waves through contact. I could even hear myself breathing.

If your going to make your own contact mic, I would reccomend trying a small Vox amplug.

It runs off 2 AAA battries, and your normal headphones plug straight in.

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Jaakko Fagerlund

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Post Fri Apr 28, 2017 3:02 pm

Re: Chubb combination lock fail

Can that amp filter out what you want? In safe work the most useful filter is a high-pass filter, as then you don't hear any footsteps from the next floor, only the high pitched "clings and dings" from the locks metal components hitting each other. I have had trouvble finding a cheap amplifier that can do this, most places just like to rip you off like there is no tomorrow.
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ratlock

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Post Fri Apr 28, 2017 6:55 pm

Re: Chubb combination lock fail

Im not sure how this would compare with the one your thinking of with the high pass filter. This youtube clip might help.

https://www.youtube.com/watch?v=UVBDHSINSxQ

Up until now I have tried an off the shelf "listening" device ive seen rebranded and sold online as a safe listening device. I bought mine on Ebay. This wasnt very good.

I made my own prototypes piazo mics, some good some not so. I tried a couple of guitar practice amps, they worked good, but I wanted smaller more portable, and low power useage. These use 2 AAA battries, and can be bought for £20 ish second hand off ebay. So not a lot of money.
They work good, very light and portable, and they are designed for a quality sound reproduction, for serious musical practice.

The only other modification Im intending to make to this set up for now, was suggested to me by Capt Dunk.

His idea is to put an in line push button to contact switch. So you dont get all the crunching, and grinding background noises you dont want. Just push the button when your ready, and listen at the critical moment.

This is a good idea that I will make soon.

The Mic im running into this is very sensitive, which may be great if its stuck to a metal door, but if it falls off your lap when your practicing dialing in the van waiting for the kids, it almost bursts your ears.
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