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Hobbies Electronics Enthusiasts Club, All elect/robotics lovers! pls come!

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limhongwoon
post May 30 2010, 11:08 PM

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Which brand is the best ??? I looking for automatic wire stripper
SUSnatzakaria
post May 31 2010, 12:13 PM

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Can anyone direct me where to get a synchronous buck controller?
Converts input 12VDC to output 3.3VDC

Thanks
Aurora
post May 31 2010, 06:54 PM

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Erm, I'm not familiar with any brand though. But all are pretty standard. You can spot the quality almost immediately when you held it.

Buck controller can get at the famous Jalan Pasar, KL....!!!!
TOROBO
post May 31 2010, 08:01 PM

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hi guys,I need help with the components here
http://www.redcircuits.com/Page31.htm

do I really need to get these specific transistor?
Q1____________BC239C 25V 100mA NPN High-gain Low-noise Transistor
Q2____________BC337 45V 800mA NPN Transistor
Q3____________BC327 45V 800mA PNP Transistor

I think I got quite a few from secondary school days which I think is the c945 and c9013...can they be used?
(I'll chck whether their NPN or PNP later xD..)

there are BT66T too tongue.gif lololol


SUSnatzakaria
post May 31 2010, 08:03 PM

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QUOTE(Aurora @ May 31 2010, 06:54 PM)
Erm, I'm not familiar with any brand though. But all are pretty standard. You can spot the quality almost immediately when you held it.

Buck controller can get at the famous Jalan Pasar, KL....!!!!
*
thank u. Just want to be sure
limhongwoon
post Jun 5 2010, 12:41 PM

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Where got sell magnet wire ?
ckh93
post Jun 5 2010, 01:27 PM

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QUOTE(limhongwoon @ Jun 5 2010, 12:41 PM)
Where got sell magnet wire ?
*
jalan pasar maybe got
azmax100
post Jun 6 2010, 10:46 AM

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hi,

Arduino tutorial video Part 1.....enjoy!!! biggrin.gif biggrin.gif


Arduino Tutorial Part 1




limhongwoon
post Jun 6 2010, 10:54 AM

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QUOTE(ckh93 @ Jun 5 2010, 02:27 PM)
jalan pasar maybe got
*
Got which online shop selling it ?
azmax100
post Jun 12 2010, 11:50 AM

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Arduino Video Tutorial Part 2


limhongwoon
post Jun 27 2010, 08:17 PM

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Which shop got sell Fluke more cheaper ??
richard0304
post Aug 3 2010, 07:31 PM

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Hi guys,

anyone using voice chips?

I'm facing some problem with the Winbond ISD4003
johnlpy
post Aug 3 2010, 11:08 PM

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You can try CETM Electrotest Sdn Bhd. They r Fluke distributor n offer good discount. www.cetm.com.my
azmax100
post Aug 19 2010, 10:44 AM

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Finally theres a forum for Arduino users in Malaysia

Arduino Malaysia Forum
http://forum.myduino.com

All are vwelcome.
marvinben
post Aug 22 2010, 04:57 PM

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QUOTE(TOROBO @ May 31 2010, 08:01 PM)
hi guys,I need help with the components here
http://www.redcircuits.com/Page31.htm

do I really need to get these specific transistor?
Q1____________BC239C  25V 100mA NPN High-gain Low-noise Transistor
Q2____________BC337  45V 800mA NPN Transistor
Q3____________BC327  45V 800mA PNP Transistor

I think I got quite a few from secondary school days which I think is the c945 and c9013...can they be used?
(I'll chck whether their NPN or PNP later xD..)

there are BT66T too tongue.gif lololol
*
you could substitute them with equivalent part, just make sure the power and voltage rating are sufficient. For the BC239C i'm not sure though, better check the datasheet.
stan001
post Aug 27 2010, 09:56 AM

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I found this Arduino a very interesting microcontroller board especially for non-electronics students and electronics professionals... ( I totally hated those complex electronics formulas ).

Read thru a few of the e-books on Arduino and it is very suitable for programmers ( those with basic C programming ) and want to interface with the real world .. using the power of software programming and hardware interfaces to do "human - machine interactions"...

Where can I purchase an Arduino board here in Malaysia or Klang Valley ?

Pls PM me...

Thanks


simbyak
post Aug 29 2010, 01:17 PM

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just wanted to do an inquiry and get guidance from you!i am trying to write up a proposal for my FYP topic."RFID basedAsset Monitoring"..however i would like to build a reader operating at 13.56Mhz but with a reading range of 1m at the very least,from my research so far i have seen tht most readers at this range have close proximity reading range at tht frequency..I think i would have to build an antenna that would increase the range of my reading circuit..my part is mainly hardware of the project(programming microcontroller for the reader circuit and building it) and my partner will do the software part i.e databse part,,is this possible in your view and would it make a good final year project? project time is 6 months.. months...thanx
tgrrr
post Aug 30 2010, 06:19 AM

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QUOTE(simbyak @ Aug 29 2010, 01:17 PM)
just wanted to do an inquiry and get guidance from you!i am trying to write up a proposal for my FYP topic."RFID basedAsset Monitoring"..however i would like to build a reader operating at 13.56Mhz but with a reading range of 1m at the very least,from my research so far  i have seen tht most readers at this range have close proximity reading range at tht frequency..I think i would have to build an antenna that would increase the range of my reading circuit..my part is mainly hardware of the project(programming microcontroller for the reader circuit and building it) and my partner will do the software part i.e databse part,,is this possible in your view and would it make a good final year project? project time is 6 months.. months...thanx
*

Hi,
1. Is your RFID tag passive or active type? Passive meaning no internal power source. Passive usually only works in very short range.
2. I've worked with 27Mhz solutions in the past. 1.5meters is achievable, 3meters is about the limit, BUT this needs antenna design expertise and impedance match fine tuning. Will be very difficult for amateurs. I suggest you find ready made solutions, trying to design your own antenna will probably kill you.
3. Depending on the RF solution you have, you may have to write everything yourself, i.e. the RF MAC layer. That by itself should be enough for undergraduate FYP project.
4. I think your partner job is too easy compared to yours.
simbyak
post Aug 30 2010, 11:22 AM

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QUOTE(tgrrr @ Aug 30 2010, 06:19 AM)
Hi,
1. Is your RFID tag passive or active type? Passive meaning no internal power source. Passive usually only works in very short range.
2. I've worked with 27Mhz solutions in the past. 1.5meters is achievable, 3meters is about the limit, BUT this needs antenna design expertise and impedance match fine tuning. Will be very difficult for amateurs. I suggest you find ready made solutions, trying to design your own antenna will probably kill you.
3. Depending on the RF solution you have, you may have to write everything yourself, i.e. the RF MAC layer. That by itself should be enough for undergraduate FYP project.
4. I think your partner job is too easy compared to yours.
*
Thnx tgrr,,really appreciate your advice.Well since i am using HF(13.56Mhz),the tag to be read is passive.However,i thinking of buying a reader module for HF and then my job will be to building an anetenna for it that can read to at least 1metre and interfacing the module with a PIC,..is this more feasible?
tgrrr
post Aug 30 2010, 12:10 PM

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You're saying for e.g. the RF reader module is design to work with 10cm range, and you wanna design your own antenna to make it 1meter?
I should think there's a practical limit to how much gain a passive antenna can get. There IS a formula for RF propagation distance. You SHOULD do the theoretical calculations first to determine how much antenna gain is needed.

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