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Bradley Michaels .
Lived in Bangkok
1,916 followers|218,316 views
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Bradley Michaels .

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Replaced all resistors and capacitors in this early 70s amp section, transistor gains still very good. Powered it up, blowing fuses. Diag time.
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Bradley Michaels .

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I am attempting to fix a PC switching power supply that does not supply 5v to the motherboard power-on header pin, I'm only getting 2.5v in my bench test.

The green lead from the atx connector goes to the PS and into IC wt7525. This must be responsible in switching the 5v to the power-on tactile switch when powered off. I tried to trace the green wire into the circuit, but got no further than that IC

I replaced a bursted 1500 uf 6v cap with one from a scraped moboard.  Not sure if that was causing the faulty voltage, but hope that does the trick.
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Upgrading opamps today. Tossing out the crappy D4588 (top) in favor of Burr Brown (bottom) opamp., already soldered in.
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Replacing ancient 2sc734 transistors
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Good camera.
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New burr brown opamps for my DAC! Can't wait to install these babies.
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cutie babies!
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Done recapping my HD radio tuner, and I see the IC ( black chip top center) is a cheap F4558 OpAmp and it is a price of shit! I'm replacing it with a Burr Brown OPA2134 fo sho. 4558, ha what a joke.
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Bradley Michaels .

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We have a CentOS server that has been hanging up a lot lately, requiring a reboot. we cannot SSH into the box when it hangs.  TOP commands shows me 270+ apache tasks, when there are usually 20-30 at any given time.  netstat -a shows all kinds of SYN_SENT responses.  Are we under SYN Flooding Attack or what is going on here?
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I tried hosting a web site on Windows, then tried it on Linux(I've had a few years experience). Boom, back to Windows. Linux can bring a similar result but Waaay too long.
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Bradley Michaels .

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Won ebay auction for another non-working electrostat. Did a rebuild on it and now it works.
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I might have misdiagnosed this computer. The box would not power on. I jumped the power supply and the PS switches on, all rails have proper voltage. I shorted the power on pins on mobo, nothing. I get 1.7v to the header pin, that seems normal. So I order a new mobo and nothing! Good lawd. Gonna try a diff ps
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Turned out the be the PS after all. The power switch pin needs 3.3 v and was only getting 1.7 v. I am going to open the PS and see if I can resolve the issue with my soldering iron, I suspect a bad transistor.
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Still have mine
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New old stock late 60s 2SC565 transistors look pretty
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I won an eBay auction for this hi end power cable for only $60. It weighs 2lbs and is thick as a US quarter. Its safe to say its shielded very well.
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Have them in circles
1,916 people
Mirko Renzetti's profile photo
masalo garaldine's profile photo
Rogerz Zhang's profile photo
Doug Hill's profile photo
Andy Sowards's profile photo
Saponline Training classes in usa,canada,india's profile photo
Jeff Byrd (Biff)'s profile photo
carry mona's profile photo
Noman Sadiq's profile photo
Work
Occupation
.NET Application Developer
Skills
MVC, C#, Entity Framework, LINQ, MSSQL, Zend framework, .NET Framework, .NET Micro Framework
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.NET Coding Kingpin
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Previously
Bangkok - Pattaya