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Old 26th May 2003, 07:54 AM   #1
StuartH is offline StuartH  South Africa
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Location: Johannesburg
Cool Hello from sunny South Africa

Hi

Greetings, on a rarher cold, but sunny Monday morning. I figure that as this forum is my first read every morning, I may as well stop lurking around as a guest and actually register. I might even get around to posting one or two questions, and hopefully will be able to contribute to one or two of the very enthusiastic debates.

Most of my experience is in the field of PA audio. Although with the price of commercial equipment these days, HiFi may well be the way to go especially if I ever want to own that 5.1 theatre at home.

Just picked up a 100MHz dual timebase scope from work. Now I just need to get through the Exams so some real development can begin.

My biggest problem. Choosing ONE project and FINISHING it before starting the next one.

Anyway, wishing you all well

Cheers,
Stuart
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Old 26th May 2003, 03:17 PM   #2
Netlist is offline Netlist  Belgium
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Hi, StuartH

Itís nice to hear that Pa is your domain.
I was actually seeking a schematic for an H&H VX-1200.
Here in Belgium, no one seems to remember those good-old amps.
Nah, your first challenge. And a very warm welcome to the forum.

/Hugo
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Old 26th May 2003, 03:41 PM   #3
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welcome Stuart

Quote:
My biggest problem. Choosing ONE project and FINISHING it before starting the next one.
well known morbus diynsis, i fight it too
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Old 6th July 2003, 10:57 AM   #4
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Hi Stuart,
since we're in the same town, maybe we could build something together...
Jack (W) 740-9745
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Old 8th July 2003, 12:34 PM   #5
StuartH is offline StuartH  South Africa
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Hi Jack

Now that sounds like a good suggestion. Did you have anything in mind?

Stuart
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Old 8th July 2003, 07:31 PM   #6
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Hi again,
I'm busy with the following:
Phono preamp (done prototype)
Complete preamp
Headphones amp (done prot.)
Power amp
Integrated amp
All these in very little time in betweens...
Problem - enclosures (metal for electronics and wooden for speakers).
AP has them ugly and I can't find a normal carpenter (my hands are both left, so boxes look bad).
Idea/suggestion - we meet sometimes and start something like a DIY Hi-Fi in Joburg, maybe it grows into something interesting?
And, after successful project:
Jack
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Old 9th July 2003, 06:39 AM   #7
StuartH is offline StuartH  South Africa
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Join Date: May 2003
Location: Johannesburg
Unfortunately, my curent project list is endless.
At the moment Im looking at building:
1 remote controlled microprocessor based preamp
2 A couple of gainclones, just for the fun of it.
3 100 - 150 W PA power amp.
4 DTS transciever for the PS2.
5 Pair of simple bookshelf speakers
6 Small hometheatre subwoofer (probable disguised as a side table)
7 A really decent HiFi rack (aka. big, heavy and asthetically pleasing)
etc.......

As you say time is a big issue. Im currently at WITS business school, doing some part time studying.

I have just found a supplier of flat packed 19" aluminium cases in Springs, and am busy investigating. There is also a toroidal transformer manufacturer in Booysens. Last time I looked their prices were pretty good!

Im with you on the Diy HI-Fi idea!

Ill try to get in touch with you later in the week. Assignment due for this evening, and I havent really started.

Cheers, Stuart
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Old 9th July 2003, 12:43 PM   #8
Shaun is offline Shaun  South Africa
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Default Hi, Jack (oops!) and Stuart

I notice you guys are building amps. I have some PCB's available for Douglas Self -style Load Invariant amplifier. If you're interested, contact me.

Stuart:

Please share with us your findings on the 19" rack and the transformers.

My work buys toroidals from W. Gardner (sp?) somewhere out your way in Gauteng (possibly Jo'burg).
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Old 10th July 2003, 08:25 PM   #9
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Hi guys (Shaun, Stuart)
I know someone who knows someone else who manufactures toroidals, but I am currently dealing with a guy who makes EI types, and some C cores. Prices very reasonable, like 100VA is about R100, etc. Springs is 10km from where I work, so I could go and check the racks...
What does D. Self amp. looks like? Complicated? Where can I check the diagram?
Keep up the good work, we'll stay in touch.
Jack
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Old 10th July 2003, 09:35 PM   #10
EC8010 is offline EC8010  United Kingdom
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The circuit for the Doug Self design is in his "Power Amplifier Design Handbook." Electronics World used to sell his PCBs (I think they were £50 per pair).
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The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...
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