Monday, July 28, 2008

PSU 15V 22A

My very first project as an amateur radio operator was a power supply unit. It is transformer based. And i build this from the schematics from the net. Also i did not have knowledge of UV PCB back then, so it was build on a vero board.... Not recommended. I added a volt and ammeter not in the schematics. The volt meter is connected across the +ve and -ve DC output and the ammeter is thru the DC +ve output. Also i recommend a bigger or 3 or 4 22000uF capacitors in parallel and a 18V 22A transformer instead of 15V.

To those who want to built this here are the schematics or you can get newer designs from

Click to enlarge

This design is no longer available on that site. Below my finished product.

Tuesday, July 22, 2008

9M2CJ father Silent key

My deepest condolences to Thiam (9M2CJ) and his family, on the demise of his fundamental this morning.

Sunday, July 20, 2008

And the winner is....


Congrats to Team V17-B for winning the Selangor Open foxhunt.

Sorry i couldn't make it due to prior commitments.

Monday, July 14, 2008

Weekly Friday Eyeball Location Changed

Next Friday's eyeball will be held at Maulana's. Pass the word around to other, in case they don't know. Location is not that far from AP2. Click map to enlarge image. Refer to map below on how to get there. Set you GPS to 3°9'11"N 101°37'19"E.

Saturday, July 12, 2008

On a break.

Guys i am taking a mental break. So much to do lately. So i will leave you guys with a couple of jokes. The second one will be easier for programmers to understand.

Joke 1
When the Software industry had badly gone down, three
software giants Sun, SCO(UNIX) and Microsoft started
producing condoms and named them Java-condom , CondomiX
and MS-Comdome respectively.

A customer using Java-condom complained to Sun that
the condom doesn't fit correctly.
Sun replied:
"Wait till we get the ISO standard".
They boasted that it will fit to any size irrespective of
underlying structure.

Well, the customer switched to CondomiX and found that
by the time he finshes reading the instructions, given
along with condomiX, his wife was sleeping and he himself
was forgetting why he is using CondomiX.

Finally he swiched to MS-Condome. To his surprise it was
very good.....and comfortable!. He used it happily.
Six months later he found that his wife was pregnant. He got
angry and complained to Micrsoft. He got his reply from


Joke 2

Micro was a real-time operator and dedicated multi-user. His broad-band
protocol made it easy for him to interface with numerous input/output devices,
even if it meant time-sharing.

One evening he arrived home just as the Sun was crashing, and had parked his
Motorola 68040 in the main drive (he had missed the 5100 bus that morning),
when he noticed an elegant piece of liveware admiring the daisy wheels in his
garden. He thought to himself, "She looks user-friendly. I'll see if she'd
like an update tonight."

Mini was her name, and she was delightfully engineered with eyes like COBOL
and a PR1ME mainframe architecture that set Micro's peripherals networking
all over the place.

He browsed over to her casually, admiring the power of her twin, 32-bit
floating point processors and enquired "How are you, Honeywell?". "Yes, I am
well", she responded, batting her optical fibers engagingly and smoothing her
console over her curvilinear functions.

Micro settled for a straight line approximation. "I'm stand-alone tonight",
he said, "How about computing a vector to my base address? I'll output a
byte to eat, and maybe we could get offset later on."

Mini ran a priority process for 2.6 milliseconds, then transmitted 8 K. "I've
been dumped myself recently, and a new page is just what I need to refresh my
disks. I'll park my machine cycle in your background and meet you inside."
She walked off, leaving Micro admiring her solenoids and thinking, "Wow, what
a global variable, I wonder if she'd like my firmware?"

They sat down at the process table to top of form feed of fiche and chips and a
bucket of baudot. Mini was in conversation mode and expanded on ambiguous
arguments while Micro gave the occassional acknowledgements, although, in
reality, he was analyzing the shortest and least critical path to her entry
point. He finally settled on the old 'Would you like to_see_my_benchmark
routine', but Mini was again one step ahead.

Suddenly she was up and stripping off her parity bits to reveal the full
functionality of her operating system software. "Let's get BASIC, you RAM",
she said. Micro was loaded by this; his hardware was in danger of overflowing
its output buffer, a hang-up that Micro had consulted his analyst about.
"Core", was all he could say, as she prepared to log him off.

Micro soon recovered, however, when Mini went down on the DEC and opened her
divide files to reveal her data set ready. He accessed his fully packed root
device and was just about to start pushing into her CPU stack, when she
attempted an escape sequence.

"No, no!", she cried, "You're not shielded!"

"Reset, Baby", he replied, "I've been debugged."

"But I haven't got my current loop enabled, and I can't support child
processes", she protested.

"Don't run away", he said, "I'll generate an interrupt."

"No, that's too error prone, and I can't abort because of my design

Micro was locked in by this stage, though, and could not be turned off. But
Mini soon stopped his thrashing by introducing a voltage spike into his main
supply, whereupon he fell over with a head crash and went to sleep.

"Computers!", she thought, as she recompiled herself. "All they ever think of
is hex!"