The first pic is the generic schematic from the datasheet...the 2nd pic is wat i try to use....i use irfb4212pbf as the mosfet....
but the result is....short circuit(limited by the power supply at 0.5A)....the current is very high n tats y i spoilt a gate driver....
i dun hv any software tat can simulate tis gate driver(i m using multisim)...so the risk is very high for me...T.T
Thx for ur advise....

This post has been edited by winky4110: Mar 21 2010, 06:56 PM


Attached thumbnail(s)

made a amp but the sound is not clear and alot of hisses...

a low pass filter will be added at the load....but if tis schematic is working, wher should i place oscilloscope to test it?

Any hobbyist here have built the 5687 preamp by diyparadise?
Refer here: Simple 5687 based preamp

My humble franken-cmoybb
caps/resistors and opamp rollable.

I know, its crazy but I like it like that.

weib,
Whatever that works for you!

In action -

If possible, resistors and capacitors should not be socketed due to parasitics and interference pickup, which can happen when you tombstone mount components. Especially components within the feedback loop

Ohh thanks!

Didn't know this, what happens if you do it?
What will happen?

Sound will suck, distortion will be high, CMRR and PSRR will become lower, opamp instability/oscillation and so on.

That's why i never allow for opamp rolling in any of my builds. If you put a socket in, you're further from the shielding of the ground plane as well.

oh my.. i was thinking to do that at 1st too.. jz tat i forgot to buy the sockets.. so juz solder in..

lucky

edited: oh hi all sifus i would like to build another amp based on this site...

but then i couldn't find IRF 513 Mosfet on farnell.. izzit ok if i use IRF 520 instead?

thx!

This post has been edited by gu~wak_zhai: Mar 31 2010, 04:34 PM

IRF510 is better. IRF520 has shittier specs.

thx for replying..

but the prob is.. farnell doesn't sell IRF510 ald.. no longer stocked...

will IRF510PBF work?

n thx for ur suggestion on buying on farnell.. i got my opa2227 d... now my CMOY works great!

PBF designates Lead Free or ROHS compliant status.

The functionality should be 100 percent the same.

i really need to read more...

thx for the info!! will get my hands on those now..

No way to work around it?

how to bend physics?

cannot leh

EDIT: Okay, conscience kicking in, jokes aside, the only things you can safely socket are the OPAMP socket (since for cmoy you hardly use anything fast), and the input caps (because the lead length means jackshit here), plus all the other things that is not related to the audio circuit (LEDs etc)

---

Added on March 31, 2010, 8:47 pmi kinda hate your new avatar.

i thought you were some new guy or something now that i've grown attached to your old one.



This post has been edited by LittleGhost: Mar 31 2010, 08:47 PM

Increased loop compensation, power supply decoupling and the stuff that LG suggested. But i prefer prevention rather than cure.



I like animu gals with that smug "you has a small penorz" look lol. Because i are smug bastid.

Either way, my next project is Blaser, Accuracy International project telah disiapkan.

This post has been edited by empire23: Mar 31 2010, 09:06 PM

hey sifu sifu sekalian... i hav a question here.. if i were to build a class A mosfet amp..

jz like the attached pic... how do i build the (-)9v and (+)9v supply?



i search thru the net n found a few schematic using max1044.. which is kinda expensive n rare..

+9v and -9v from a 9v battery

any other cheaper way to build 1?

thx in advance!

This post has been edited by gu~wak_zhai: Apr 7 2010, 09:11 PM

:\ just use a transformer and feed it to a simple LM7809, LM7909 complementary 9V regulators.