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1
I thought it's a real beetle, now it makes much more sense :)
2
Electronic circuits / Refreshment of rechargeable batteries?
« Last post by Physikfan on Today at 01:30:41 PM »
Two rechargeable batteries, one NiCd battery D and one NiMH battery C
can not be recharged after 2 years of very moderate use:



Both batteries were used in two different groups of each four identical batteries of the same type.
The three others of each group still work perfectly.

Now my question:

Please who knows successful refreshment procedures of such batteries from personal experience?
3
Yes, I'm scoping serial data and optic transmitter output there. At first I thought those single audible "pop" pulses were random, but at closer look you can see they are not
Sometimes at the note start command the interrupter makes one pulse, then pauses, then continues playing the note

Currently in my setup I'm unable to test .omd (SD card) input, but I would be surprised if I wouldn't find the same problem. I tried disabling pitch bend and polyphony and the problem still remains
4
Dual Resonant Solid State Tesla coils / Re: oneTesla MIDI interrupter issue
« Last post by Mads Barnkob on November 18, 2017, 05:27:50 PM »
Great catch finding this abnormal behaviour futurist!

This is a very interesting issue, because I did notice differences between the 3 MIDI modulators I have.

I got a dual channel from Eric Goodchild, dual channel from Loneoceans and the single channel from oneTesla.

Are you just scoping the MIDI dataline and the opto output in the above shot?
5
I have always used http://www.speedtest.net/ for measuring upload/download speeds, there is plenty other services just like that, so compare a few of them and look at the averages.
6
Solid state Tesla coils / Re: SSTC Not Working Correctly
« Last post by Mads Barnkob on November 18, 2017, 05:23:18 PM »
You have learned a lot of lessons and that is more valuable than having a kit work in the first go :)

You are absolutely right about IRFP460s not going to work in a DRSSTC, MOSFETs have no place in switching so high peak currents, just do a quick calculation with on-resistance and peak current so see that you are trying to dissipate the heat of the sun in a glass of water.

Have a nice break and certainly looking forward to help you build a DRSSTC :)
7
Solid state Tesla coils / Re: SSTC Not Working Correctly
« Last post by Laci on November 18, 2017, 02:58:03 PM »
Yes,it's not easy at least for me.The system is down again,due to my stupidity,because I disconnected the interrupter and the breaker popped.One of the IGBT's died.

Now I can relax a bit,and focus on other things.I'm proud,that I could make a pretty good SSTC.The driver circuit works great.The IGBT's gate waveform was really good(see the picture).The interrupter is OK,but without shielding anything,or optical fiber connection,it isn't stable.

I still have quite a lot things to upgrade.I'm planning a DRSSTC,but it wouldn't be a good idea to run it on a IRFP460 halfbridge...

Many thanks for this forum,and for everybody who helped me to get here!I will not leave,just take a break,until new transistors will arrive :)
8
Solid state Tesla coils / Re: SSTC Not Working Correctly
« Last post by futurist on November 18, 2017, 12:50:22 PM »
Don't worry, I'm sure you'll have another chance of presenting your project and that your teacher understands that building SSTC isn't a piece of cake
9
Hello to all IT insiders

My question:

I currently have access to Internet boxes different providers at the same location.
How can I reasonably objectively check the Mbit rates of different providers?

Please the answers in understandable language for non-professionals in digital electronics!!!

Best regards

Physikfan
10
Dual Resonant Solid State Tesla coils / Re: oneTesla MIDI interrupter issue
« Last post by futurist on November 18, 2017, 12:30:17 PM »
It's just atmega328p board bodged together with lipo battery and two pots, looks messy but that isn't causing the problem



Listened to some of these on earbuds, didn't hear any popping.  Attached is capture during Mortal Combat.

Could you trigger at note start?



This is mortal combat midi playout I captured
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