Wednesday, August 8, 2012

3W Homemade Flash Light

At some times, I just need a bright flash light, that doesn't costs too much.

Yup, I'm using discarded Li-Ion batteries. 

No lens attached yet.

Front view. Note the heatsink.

Switching mechanism is just a simple wire header.



3W is bright enough for now.

Monday, March 5, 2012

Yet Another Bench PSU

Somehow, for some unexplainable reasons, I just need another PSU. Here we go again!

Selecting heatsink.

Gathering all required components.

The victim.

Here we go!

Inside the power adapter gut.

Marking hole for meter.

Drilling holes.

Drilling hole for heatsink. Duh!

As usual; cleaning the heatsink.

Test fit.

Making steps.

Don't forget the pot...

So far so good.

Just done soldering.

Replacing with crocodile clips.

Almost there!

Alhamdulillah! Done!

Another view.

Driving a load.

Let's call it a day... I'm tired.

NE555 Oxygen Sensor Simulator

Just done soldering...

Drilling hole for mounting pot.

Rough test...

Can't help myself. :)

Finished project. Whew!

In-Car test, it works!

My Ancient Car Voltage Stabilizer

Eye candies!

Works better than commercial ones...

Cheap Soldering Iron?

Don't trust them!

Sunday, January 1, 2012

Making Solid State Switching for Car Headlights

Commonly, car headlights are triggered with relays. I'm fine with that, but, I just dislike the way the contacts wears out over time.
Solid State Relay (SSR) are already in the market, but tend to be quite pricey.

This is my attempt of building one cheaper.

Preparing the PCB.

Searching for perfect configuration.  

Cleaning the heatsinks.

Applying thermal paste, using line-method. Why?

Ready to go.

Upper left is the 555 inverting gate driver, lower right is the power PMOS.

Almost done...

Cleaning flux residue with methanol.

I'll update this post soon.To be continue...

Helping Halim

My pal Halim want to weld his table. So, me as his good friend, just help by standing, watching him. :)

He's busy, I'm not... :)

Work in progress...

So, yeah, the table is usable now, but, with great deal of worries... :)

Reviving Old Speaker Amp

About five years ago, I'm using my PC as signal generator, and this speaker amp to drive a transistor, which is then driving an ignition coil. I'm using only the left-channel at that time.

While having fun, for maybe about 3 months, boring with just 12V supply, I tried 24V. It ran for few minutes, then, ..., silence... I blew my amp! Feeling guilty, I decided to stop play with it for a while.

Listening music with only my right ear for quite some time, I decided to play with it again.
And yes, now the both of the channels are burnt!

With some few limited spare time, I try to revive it back.

Long time no see...

Opening the back cover.

Here's the circuit board.

Close-up on blown amp IC.

New TDA2030A. :)

Unscrew the heatsink.



Poor IC.

Unscrewing them.

End up in my junk bin.

Old thermal paste, need to be clean...

Using methanol.

Wiping it off.

Applying fresh paste.

Kids, don't do the same mistake as I do here.
Don't fasten the screw with powered screw driver!

Now, that's better.

Soldering it back.

Reconnect any connectors left.

Reinstall the back plate.

Hey, it's alive!

Me and my dad bought those IC for about  MYR3 each. New speaker amplifier costs almost MYR100. That's a huge saving!