Hello. Im newbie. Haven't been to Jalan Pasar though. Do shops there carry op amp stuff?

have ordered from rs couple times, no minimum order free postage, even a small couple ringgit opamp

How to make payment shopping on RS? i see on their website, need to be paid using credit card. can be paid using other way?

Pictars:


Main Amp



PSU
Sounds pretty good so far. Might release it. I have some leftover prototype boards if some of you are interested.

At the moment STX's measurements at 0.0014% THD, 33 Ohms, 2Vrms. Can drive up to 1nF of capacitive load yet being stable. (1nF is ALOT!)

Output stage is biased at 60mA of Class A goodness.

To all master and sifu, do u all know where can get bottlehead crack headphone amp kit at malaysia?

Followed your advise, created the PCB layout with ground plate, attached

[attachmentid=3238108]

trace's a bit too thin.

For my own use, I typically use 1.0mm for signals, 0.6mm for SMD pins, 1.3mm->3.0mm for power lines.

Try to make them at least 1.0mm.

EDIT: Jumpers are your friend. Don't be afraid to use them to get the best layout.

I tried 1.0mm but the trace is very big.. sigh..

damn, so hard to do, still trying.. ahha

EC3 isn't necessary.

By all means just use a larger EC1 and EC2.

The removal of EC3 will allow more ground space to go through.

Will this cap be fine: http://my.element14.com/panasonic/eeufc1e4...&in_merch=true&

or this: http://my.element14.com/panasonic/eeufc1c1...00uf/dp/1848432

This is it i guess.. XD

[attachmentid=3241457]

where is the loop? i cant seem to find it

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Added on January 3, 2013, 8:41 pmare referring c3 and c2?

Will this fix it? I really dont know about ground loop.. sorry for my noobness

[attachmentid=3242481]

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Added on January 4, 2013, 5:01 amI illustrated what i understand about ground loop in the attached picture, marked in red circle but i cant see that in the pcb layout 

[attachmentid=3242665]

Finally, cleared all ground loop, thanks to all sifu that helped xD

[attachmentid=3244109]

whats the purpose of the relay there? why this small circuit need a relay? I understand the need of relay in car ignition but this one i no idea..

Thanks, but if you guys want to see the full schematic, it cmoybb

http://www.jdslabs.com/pdf/cMoyBBx203R_Schematic.pdf

I will continue next week, this week need to submit my fyp, hate doing the report..lol

hi,

may i know tat if i wish to connect external speaker to my hdtv, and use the external speakers only for all input, izi possible? where shld i refer to?

tyvm

while waiting for my parts to arrive from ebay, i tried put together a transistor amp, but having a little problem, battery have no effect on the circuity.. with or without battery, i only hear very tiny sound but the sound is clear but very tiny, anyone can help?

i double check everything, the battery is powering the circuit, no transistor is heating up..

schematic is from here: http://electronics-diy.com/4x4.php
[attachmentid=3276157]

[attachmentid=3276158]

Been reading PCB design ebook, and i come up with this, sifu please take a look, TQ.

And anyone know where i can find this( http://malaysia.rs-online.com/web/p/potentiometers/2499159/ ) with switch integrated?

[attachmentid=3284568]

EDIT: Found it
http://malaysia.rs-online.com/web/p/potent...7633D424F544826