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1  General Category / General Discussion / Re: Soldering DIP with solder paste on: November 24, 2012, 02:48:25 am
Thanks for the reply!
2  General Category / General Discussion / Soldering DIP with solder paste on: November 23, 2012, 11:45:50 am
Is it possible to use a thicker stencil to accurately place solder paste on a PCB and reflow solder DIP components in a reflow oven (+flux spray)?
Will it produce a defect-free and solid bond? Have anyone tried this before?
3  Topics / Product Design / Re: PCB Nets on: November 13, 2012, 02:23:50 am
Thanks for the help!
4  Topics / Product Design / PCB Nets on: November 13, 2012, 01:43:23 am
Is CADSOFT's EAGLE capable of producing nets like in pic2 instead of pic1? How to do it or any other software recommendations?


pic1


pic2
5  Using Arduino / General Electronics / Re: LM317 Adjustable Voltage Regulator on: December 09, 2011, 12:57:06 pm
Is the LM317's maximum output at 1.5A? Can it handle over 1.5A of current (not output, handle)?
6  Using Arduino / General Electronics / Re: LM317 Adjustable Voltage Regulator on: December 09, 2011, 10:47:46 am
Confused again. So if I had a 12V 0.5A (6W) power source, and I want a converted voltage of 6V. I will have my output at 6V 0.5A? or 6V 1A ?(Power=Voltage x Current = 6W)
7  Using Arduino / General Electronics / Re: LM317 Adjustable Voltage Regulator on: December 09, 2011, 10:07:24 am
So, It'll depend on the power source, right?
8  Using Arduino / General Electronics / Re: LM317 Adjustable Voltage Regulator on: December 09, 2011, 09:49:35 am
One more Q, if I input a 12V 0.5A (6W) into the LM317 and expect a 6V output from the LM317, will I get a 1A output current? (Because 6W)
9  Using Arduino / General Electronics / LM317 Adjustable Voltage Regulator on: December 09, 2011, 09:07:27 am
  • Will I get a constant 1.5A output current (as stated in the datasheet) although having a power source which its current is lower?
  • Although having 6V as the power source, can I get the output voltage at 12V and also constant 1.5A output current?

Can anyone answer my questions and tell me more about it? Began to get confuse on voltage regulators.

Datasheet: http://www.national.com/ds/LM/LM117.pdf
10  Using Arduino / Networking, Protocols, and Devices / Arduino interfacing with mobile phones on: November 26, 2011, 03:31:29 am
Is it possible to save money to buy a GSM/GPRS modem by having a connection to a mobile phone to send AT commands? How to actually bring out their RX and TX pins in a phone (Nokia preferred)?
11  Using Arduino / LEDs and Multiplexing / Re: 3 separate 74HC595 how to control? with less pins on: October 17, 2011, 01:21:15 am
ya, just connect data out of the 1st IC to the data in of the 2nd IC, data out of the 2nd IC to the data in of the 3rd IC....
connect all clock and latch pins to the same output of the Arduino. On the programming, you need to use the shiftOut function 3 times continuously. So, the 1st shiftOut will go to IC 1. But when you shiftOut the 2nd time, the 1st shiftOut binary data will be pushed to the 2nd IC, and so on...
12  Using Arduino / Project Guidance / H Bridge Motor Driver on: October 10, 2011, 05:06:23 am

-Why not use 4 NPN transistors but use 2 NPN and PNP transistors?
-What is the use of the diode in this circuit?

Check out: http://www.robotroom.com/BipolarHBridge.html
13  Using Arduino / General Electronics / NPN & PNP transistors on: October 09, 2011, 05:25:27 am
What is the difference between NPN & PNP transistors?
Does NPN transistors activate by connecting its base to Vcc? and connecting the base of a PNP transistor to ground will activate it?
(NPN: collector-positive; emitter-negative; base-positive || PNP: collector-negative; emitter-positive; base-negative;) Correct?
14  Using Arduino / General Electronics / FTDI and MAX232 on: October 08, 2011, 05:27:41 am
What is the main use of the MAX232? If a FTDI chip us used with a USB connector, will I need to use the MAX232?
15  Using Arduino / General Electronics / Re: 555 IC on: October 08, 2011, 01:22:11 am
Can the capacitor of the circuit be non-polarized? What is the difference between a polarized cap and a non-polarized one?
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