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Test Equipment / Re: Rigol MSO7000 Unboxing & First Impressions
« Last post by bitseeker on Today at 03:57:40 am »
It's not unusual, especially with low voltages. Instead of stringing power traces all over, convert it where it's needed.
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You don't need ultrahigh sped sampling in case only thing you want to measure - average power. The trick is - additional bulk capacitor between current shunt and device under test, to smooth current spikes and be able to run lower sampling rate.

Yes, excellent point.  If the OP has a limited budget, that is really likely the only way he will be able to do what he wants.
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It takes time to rebuild industries, but in time I hope the UK, gets there, as needed.

How long did it take the US to tool up for WW II?  I don't know the answer but it must have been pretty darn quick.  True, we were building airplanes and battleships, no super high technology, but still, it didn't take long to set up the factories.

I worked at an aircraft plant in the early '70s and a lot of the machines were owned by the Federal Government.  The company didn't have the funds to buy all the necessary machines during the war so the government provided them.  Twenty five years later we were still using them.

Officially WW II started Sept 1, 1939 and ended Sept 2, 1945 - six years and a day.  The US wasn't involved with the war in the Pacific until Dec 7, 1941 and the war in Europe Dec 11, 1941 when Hitler declared war with the US.

So, what did we create during that 6 year period?  It was pretty amazing!

Don't sell the US short when we decide to do something.

ALL of that was financed by the US Government in response to an existential threat, and in most cases, the production facilities already existed, they were just converted to build military vehicles or whatever instead of civilian cars.

And that was able to take place only because of geography. The US not only, at that time, had large untapped and easily accessible oil reserves, we had not been bombed so our industrial base was fully functional.  At the end of the war this is what allowed us to leap frog the rest of the industrial world and become the economic (and military) superpower.  Unfortunately we've squandered that bounty away in a few decades.  Because of that, historically speaking, our empire will be a flash in he pan.
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Hello friends,

I finally had some time to build the circuit for this phono preamp. Here is how I built it. It is home brew style.



And here, once again, is the schematic.



It can take 18 to 24 VDC and I am running it at 18V.

I am not getting as much gain as I had hoped. It works, but at a slightly lower volume than expected.

So, if I increase the voltage to 24V, would I get more volume out of it?

Thanks
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Vintage Computing / Re: What was you first computer?
« Last post by Cerebus on Today at 03:52:56 am »
:scared: What how?!? Where did you keep it? What year was that? I'm guessing that was at work or you worked in a university?

This was at secondary school (high school to you), the computer was at the local Polytechnic.

I thought I was old because "computers" was an actual separate class you took, where if you finished early you got to play with the paint brush program!

I part taught the first computer class at my school. A maths teacher started a supplementary class in computing for the form two years below me. I'd spent a week the previous summer at ICL with a bunch of other kids from all around the country being run through the "computer education in schools" course that they had designed for secondary schools as a dry run for the course material. As a consequence the teacher, who all this was new to, talked me into being his assistant. I was the original kid who knew more about computers than his teachers.

We used to have to write stuff up on coding forms, send it off to be punched on 80 column cards and run as batch jobs on the 1904 at the Poly. Later in the year we got the loan of an ASR33 and a 110 baud dialup modem with acoustic coupler that we could use online.

I got to know the people in the computer centre at the Poly and they'd let me use the programmer's terminals in the computer centre and have access to the (huge pile) of official ICL documentation that they had.  If I had questions I had all the computer centre's programmers to ask and they were happy to help as I was politer than the students and academics they normally had to deal with and actually listened to the answers rather than tried to get them to 'do my homework for me'. Happy as a pig in shit was I.
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I u took a conductor, and energized it with +500V, then -500V, at whatever freq like in the motor, with the 10ns rise time....

why can't they just build a probe and probe the EM waves just above it in free space ?
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General Chat / Re: YouTube's 'Recomended' recomendations now suck.
« Last post by bitseeker on Today at 03:48:15 am »
Ah, I think I figured out where the discrepancy lies. You're referring to the Recommendation section on the home page and I'm referring to the recommendations that appear with the video being watched. The recommendations on the home page don't have this "bug."
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Test Equipment / Re: FLUKE automatic multimeter 7-300 Any ideas?
« Last post by 001 on Today at 03:44:48 am »
 ± 2,9% looks good
like my analog meter  :-DD
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Other Blog Specific / DIY dummy load #02 - Basic circuit test
« Last post by VEGETA on Today at 03:44:36 am »
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I do agree, however, that we should quit spending our country's money on useless wars and defense of other countries.  We have more important things to do with the money right here at home.  A trillion dollars or so would have fixed a lot of bridges and repaved a lot of roads.

That trillion dollars could give everyone in this country an undergraduate degree in their field of choice.
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