square wave power supply

Looking at the test setup

A view showing the DC to AC converter, with the test setup. (Bottom to Top of image) Fluke Scopemeter 115, Fluke 87 V, PEAK POWER 800W DC to AC supply. Plugged in to it is a “Extech AC Line Spitter”

I was looking in to my old 800W 120VAC DC to AC supply, to see just how bad the square wave is.

The test in my view was not complete. I did not load test the supply. To see how the wave forms was effected. Due to missing Nut assembly for the Positive lead.  I felt it would be unsafe due to insecure connection that could heat up due to possible arcing issues.

With the unit unloaded I proceeded to do a preliminary look at it with the 87 V,  a digital meter. The 87, read that it was 120.2VAC and 61.12Hz.

Fluke 87 IV displaying ACV

Fluke 87 V, showing 120.2 on the display

Fluke 87IV looking at hz

Fluke 87 V, showing 61.12Hz

With that I was curious what was going on with the waveform.

I hooked up the Scopemeter in to the mix. AC Neutral to  Ground reference  for the probe. The probe hooked in to the AC Hot on the line Splitter.

with that, I set the A input channel to 10:1  and took a look.

SCOPEMETER showing the stepped waveform

in mixed scope and meter view on the scopemeter

with that we see that it is going from +120V to 0 then -120V in reference to Neutral.

Screen grabs from the ScopeMeter

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AD replacement

So I am looking to move away from Windows 2012r2 to a Linux stack to admin my windows boxes. So far I found UCS by univention. Based off Samba 4 it looks promising.


More to come as I dig deeper.



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just a cool production photo

Louisiana Tech’s production of Dearly Departed

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Asterisk hold music

I was working on updating my hold music on my asterisk lines.

a quick method of doing this. Is as follows

First covert the audio to mono 8000 sample rate “wav” files

Then with sox installed

for f in *.wav; do echo $f ; sox $f -r 8000 -c 1 -s $f.sln -q ; done

rm -v *.wav


finally update the musiconhold.conf file with the directory of the processed files.

Thats it!

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I have been looking at my past.

So I have been digging in to my past, as I have been performing a migration of archive data. To new hard drives. any ways you can see some of my Lighting design work here .

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Learning Python

I have been studying Python, by reading Python Essentials by Steven Lott. It has shown me the basis of the language so far. Coming from a C background, I will be comparing data types to C data types.

The array data structures   like Tuples, where you can set a static fixed list. Like

static int myArray[3] = { 1,2,4,5 };

The list structures is very flexible similar to
int list[3];

the difference is in python you can add a element to the list without having a new object to move in to.

I find the Python language powerful, and it hides the nitty gritty.  You do not have to manage your own memory.

It will be fun to learn. One goal I have for this is to rewrite my LED sign software.

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embedded electronics

I now have a C/C++ compatible development platform. a arduino uno this device is a micro controller does what it needs based on what you program in to it.

i have all ready done the blinking light hello world. so now i can take the knowledge that i have gained working with PIC chips and apply it on this new platform.

My goals for it is to make DMX controlled random things. For now.

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OSPF to BGP on the wan

So I have been working on a multi-site vpn, with my Friends. With BGP as its core routing principle, which was upgraded from OSPF.

Its been interesting, with BGP handling the routing path its better then OSPF. As OSPF  allows *anyone* to announce a IP range, in a multi-site wan with different admins stepping over a IP range is bad, Figuring out who did it is a little bit harder with OSPF. Thus I looked for a new solution that is cross platform compatible.  BGP was the answer I came up with. This solution allows me  to see  the path, who owns the network

So you might be asking how did you get assigned AS numbers? There is a range set aside for private use in RFC 6996 .

to summarize from section 5 of that document:

 IANA has reserved, for Private Use, a contiguous block of 1023 Autonomous System numbers from the “16-bit Autonomous System Numbers” registry, namely 64512 – 65534 inclusive. IANA has also reserved, for Private Use, a contiguous block of 94,967,295 Autonomous System numbers from the “32-bit Autonomous System Numbers” registry, namely 4200000000 – 4294967294 inclusive.

From this I feel that me and my friends have more than enough AS numbers to play with.



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Job and lighting gigs

Hi y’all,
I have been busy keeping up with work at Rackspace and running lights at a club called The Roost located in North Austin.  its been interesting to run lights for different bands.

You can see some of the pictures I have taken in this post.

In  summary: Lights + good music + Fun people = good gig.


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still working

So i have been working mostly at work.

Some side projects like the 24 hour Video race.

Alpha 11 music Video is now on You tube.


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