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Electronics & IC Programing / Re: How do you terminate your coax to BNC?
« Last post by Will_D on Today at 08:30:58 AM »
Surely Farnell or Radionics would stock crimpers ( at a price  :bugeye: )

Cheers

Will
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Electronics & IC Programing / How do you terminate your coax to BNC?
« Last post by PekkaNF on Today at 08:18:28 AM »
We were pampered 30 years ago in school electronics lab. No shortage of test leads.

There is usually vety little point of rolling your own BNC/RG58 stuff, but on RG174 or RG316U cables, and panel connectors etc.

I'm having a hard time finding crimpping pliers for AF 1,75 mm pin and 5,6 mm sleeve.

https://www.tme.eu/fi/details/5-1634500-1/bnc-liittimet/te-connectivity/

Dimenssions:
https://www.tme.eu/fi/Document/11a4780343b55fee08f6e9023cade175/5-1634500-1.pdf
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Electronics & IC Programing / Re: Simple TTL signal generator/counter with sum
« Last post by PekkaNF on February 22, 2018, 05:45:50 PM »
My signal generator sucks.

Need better buffer for TTL. Would something like this do? Sans oscilator



Testing small test probe, idea from here:
http://jahonen.kapsi.fi/Electronics/DIY%201k%20probe/

Put some pogos on dupont connectors. These will hook on normal pin strip and on most connectors.

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Electronics & IC Programing / Re: Simple TTL signal generator/counter with sum
« Last post by eskoilola on February 22, 2018, 11:34:45 AM »
Well. One can, of course, harness an entire buffer to output the needed power. Another option would be to use small low threshold N and P fets connected fae-to-face. Of course one needs some sort of current limitation as these WILL conduct at same time, being a very short time that could be two tiny inductors.

I made a largeish FET gate driver circuit that was capable of outputting 15 V/pp into a 0.47uF capacitor @ 10KHz. The test capacitor fried - of course - just in 2 seconds. The output current was in the 20A region. This kind of circuitry is needed when FET array (many fet's in parallel) need to be switched on/off very rapidly. In this case the array consisted of 27 high current, medium voltage FET's. The gate capacitance was 0.1uF all together including the miller capacitance. The driver used the face-to-face FET topology which I have found to be quite easy to get going.
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Electronics & IC Programing / Re: Simple TTL signal generator/counter with sum
« Last post by AdeV on February 22, 2018, 08:08:53 AM »
Sounds like an ideal application for a smallish FPGA; but I don't know if you can get those in "hobbyist friendly" formats (i.e. DIP).
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Our Shop / Re: Another machine joins the stable...
« Last post by AdeV on February 22, 2018, 08:05:29 AM »
New job in the UK... unfortunately it means a long-ish commute every day, but for close to double the money, it's worth it. 12-18 months there, then I'll look for something more convenient...
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Gallery / Re: metal bandsaw improvement
« Last post by celsoari on February 22, 2018, 06:28:09 AM »
Really impressive. I have an identical machine and will try some of the ideas. I especially  like the  support formed by the two lengths of angle.

Many thanks Ian
Thanks for comentary
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Gallery / Re: homemade tool & cutter grinder (step by step)
« Last post by celsoari on February 22, 2018, 06:26:58 AM »
Nice job super videos enjoyed that very much makes me want to work on my setup!
Thanks!!
Thanks Doc
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CNC / Re: DDCSV1.1 4 Axis controller
« Last post by Will_D on February 22, 2018, 04:42:06 AM »
S is in RPM, so if the parameter value is 2.54, times 100 would show a speed on the display as 254.

If you really have a spindle then the speed will be approximate depending on the a/d converter in your spindle driver!

Cheers

Will
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Project Logs / Re: Flight simulator for our museum!
« Last post by John Hill on February 21, 2018, 10:44:41 PM »
Thanks for the comments, most of the knobs and switches can be ignored!
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