Week without tutorials...

Well, din really finish tutorials... yet. Those ques can't solve 1 la... So can ignore... and if do too fast also useless, the 3 homework question for polar coordinates plotted dy, next week lecturer show another example then got all wrong... So i'm putting a neutral gear on my tutorials, just let it flow la..

Yesterday night tried to built a FM transmitter up, but failed...

It short circuit my new 9V battery to now remaining 8.5V... Waliao le... The battery seriously exp 1 lor... The battery hot till (luckily din explode, its 4am in the morning)

Basically today got a fm coil from car's alternator from my parents car service shop - Finally there's something free in my project...

I'm going to rebuild the FM transmitter again, removing those parts and re-solder to the board with a newly designed circuit positioning. And i've installed some programs to help me too... (Hope it can detect simple faults before i place the parts on the board)...

Still working on it, must finish it by today! There's 2 more projects on the way and test 4 is coming...

Built but got some short circuit le... Can't really detect fault... Just hope its not the transistor... RM3 le...

Now opting for software simulation before soldering...

DONE!

Upgrading works will commence soon...

These few days I went to Brother's to get a cheap tweeter at RM5 and a set of speakers at RM30.

Well, stuffs like these are the cheapest that they sell over there.

Perhaps they are already immune to me... Cause every time I go there, normally I will just look around and stare at the price... And also go to the outdated stocks section to see cheap stuffs they offer, and I will just walk off later. Haha... These led to few sales personnel dy dun choi me... But it's ok, I'll have a more peaceful in making decision.

Recently I saw Brother's ad in Media Focus, they're offering a 3 way speaker at only RM30, woofer forRM20. So I went there one day and eventually had a great intro from a sales personnel, (just ask me to increase my budget gua)... I told him i'm going to do a project and need cheap speakers will do, he showed me the RM30 one first, then would like me to increase the price range higher, RM58 for a better one (4way). But waliao le, RM60 i dy can buy two set of the RM30 1 la... He said RM30 1 no sound 1 wo, the RM58 is a better brand. And since i'm interested in getting a tweeter also, he recommended me RM99 with tweeters and 3 way speaker. I was like, waliao dy...

I then asked for price of a branded one... He told me its going to be RM200 and above for branded, but they're having a promo... (Walks away to check stock)

RM158 and 188 for Panasonic 3 way/4way speakers. I was like (Hey, thats really cheap for a branded1)... But budget really cant la, if not i'll be starving to death in college just to invest on a pair of branded speakers.

Eventually I ended up with the RM30 speakers and a RM5 tweeter (RM3.50 cheapest, i was like, i think it'll be gone as soon as i connect it to my amp. He recommended me a RM68 one...)

When I was unpacking to test the speakers at midnight, which results in dizziness on the next day lectures, the cover says 600W PMPO... I was like, RM30 and 600W? correct bo? A good research on internet says that PMPO is just a dumb measurement of watts a speaker can handle... Fine then...

The speakers is ultra light 1 lo, compared to others. the magnet is like only a bit and can unscrew one le... But RM30, can la... 3 ways some more le... So I quickly put it to my amp... And hey, its quite loud le. I dun see any distortion from the speaker... Worth gua. The tweeters are doing fine too... Max treble and max vol can give a very loud performance.

CHEAP = OK OK Punye QUALITY... Can la...

I also bought a RM20 amp, just tested it and working well also...

Seriously I dun really know whats the difference in performance of branded and unbranded yet beside the material factor...

Anyway, I'm firing up a new system soon!

It's going to be something like two speakers in a casing with an amp.

That box must be lightweight (My speakers can collaborate very well as its ultra light 1), LOUD, Going to full range of sound, 1 tweeters and 2 ways speaker for each channel, and user friendly...

Now i just need boards and jigsaw cutters... See how la... Haiz... Test coming le... Chaoz..

Project Major Update...

Since holidays I had been working on multiple electronic projects, based on my interests of course, besides adding more functionality and practicality to my product.

Outcome of my Stereo Pre-Amp:

RM 88 CHEAPEST if bought outside

I'm offering RM 60 for one (each custom made) if u wan it...

Right Frontal View:

Nice? The box is custom made to fit the circuit perfectly...

Now lets look at the construction progress:

Not much pictures taken as I spent most of the time troubleshoot to make the pre-amp working perfectly.

Switch at "ON" position

Switch at "STANDBY" position to tell you the pre-amp is ready to kick up

Whole view

Dorsal view

A Pre-Amp would not work without an amp. So what's below is also another custom built amp.

With LED Volume Unit Meter! Rare item man!

Once you turn on the switch for the amp, Pre-Amp is set to be in standby mode until you turn it on. This is ultimately prefect for normal power up without sudden "pop" that will damage the speakers.

Control knob functions:

Blue-Volume

Red-Balance

Yellow-Bass

Orange-Treble

Thin Red-I just told you

You might think that The arrangement of the control knobs seems wrong, but its purposely made like this for quicker access to Bass and Treble controls, which is more easily reachable than less used controls like Balance. Volume knob is all way to left for easy access also.

Another thing about this controls is the minimum volume will be on the right and maximum volume on the left. Which is a total contrast to a normal pre-amp, hi-fi system, etc. This is purposely introduced not to complicate the users, but to add an innovative yet distinctive touch on this unique product.

This pre-amp is currently powering my old Sony TV woofer. With little treble and 3/4 for bass at half of its volume up, the sound produced should be loud enough to play with...

Now i'm enjoying the system with newly released Fish Leong song's.

(Yea, her song doesn't need a woofer)

Anyhow, i'm very satisfied with the performance of this pre-amp coupled up with my 300 Watts amp. This whole system is cheaper than anything else you can find outside with it's substantial performance.

Up Next I'm going to improve on the appearance of the pre-amp. Perhaps paste sticker overlaying the front panel to improve its overall appearance.