hoho bro you won't wine that here, unless outside of this country.....

This is 'Bolehland'.. memang boleh tak jual/stock/supply..

Just got my TDS2002B and SFG-2107

Tested a pcbed amplifier that I built and designed without prior scope testing (only done simulations)

Turns out it's stable

This means I get to realize the discrete design I've been working on soon enough

Obligatory show off picture.








have yet to build a test jig (for variable load) for the OSK. The waveforms are taken without load. Amplifier tested is my dBM amplifier using the originally selected OPAMPS (AD825 x2, OPA627 x1)




1KHz Sine Wave 20Vpp (prior clipping)


1KHz Square Wave 20Vpp (prior clipping)


100KHz Square Wave 20Vpp (prior clipping)


Shows very nice results Squarewaves a bit noisy but I suspect it's due to 24VDC wall wart and the lower PSRR of the output stage due to the choice of using resistors for CCS as an alternative to a warmer sound and cheaper budget.

Will get a frequency response graph (dominated by lead compensation) and real time FFT measurements when I build the required test jig.

This post has been edited by LittleGhost: Feb 7 2010, 07:03 PM

congrat bro on ur gear purchase.. when can we PK our discrete amp?
hehe

SOON!

Maybe we'll meet up after my midterms

lol.
waiting for another great stuff from you bro!
new toy arrived liao hohoho

F5, this way will work?

gila @.@

Do you really need that much cooling?

My friend ask me how to get sound from the speaker his cousin gave him, its a satellite from Sonic Gear Enzo 7000 (just guessing from the looks of it because he have no idea too )

Having no amplifier, I try to 'hack' the onboard from my laptop to drive this speaker, to my surprise it sounds unbelivably well!



Because I have no solder iron at my dorm, ingenuity is needed to connect it, the answer: ducttape



Well, because the 'discovery' of a forumer about the tweeter of Sonic Gear is fake so I test it whether this one is a display or a real deal by cover up the midbass, use sine wave generator, ramp up the frequency above 10kHz, and just as I expected, a fake tweeter not a single sound comes out of it, what the hell Sonic Gear is doing? They just ramp up the production costs putting faked one there. Well, they let the eyes deceive what you hear I guess

Najmods,
Was it worth the trouble? At the same time taking a risk shorting some wires and damaging your lappy?

desperate times calls for desperate measures

No damage was done, I know what I was doing. Everything still work like clockwork

Famous last words..
Good that it turned out well.. Sonic Gear, I think it's not worth the effort..

Well, I just wanted to test whether the speakers work or not as he wanted to buy an amp for it. I don't want him to spend money on amp and find out the speaker is busted to begin with

chappies - am going to HK for biz , any suggestions where to buy DIY amp goodies like nice PSU capacitors, heatsinks etc etc.. I know Ap Liu ST - any other suggestions of good shops/locations u kaki's have checked out ?

The radiated switching noise from the brushless DC fans isn't something i'd live with.

wish someone pro can help me....
i m doing a class D amplifier but facing problem in using the gate driver..,i hv tried to use ir2011 n hip4081 but fail. anyone provide me a schematic as reference?

^ You'll have to provide a whole schematic and topology before anyone else can comment. Generally we'll have to see your design before we can recommend another one.