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16  Using Arduino / General Electronics / Re: Component, can anyone identify this? on: June 23, 2014, 06:46:46 pm
Ive seen scr's in that case style, almost never seen a triac in that case, but it could be either.
17  Using Arduino / General Electronics / Re: how to use a 5 lead MOSFET on: June 20, 2014, 05:26:29 am
I feel it is incorrect to call it a mosfet, in the same way you don't call a solid state relay a triac    Sure, it uses a a mosfet internally as a switch, but the circuit is "integrated" with other components to create a "switch" solution.  It is an Integrated circuit and happens to use a mosfet,  similar to all those IGFET's in CMOS logic IC's (and we don't call those FET's either).

It's an electronic switch, just like the datasheet says.
18  Using Arduino / General Electronics / Re: 555 timer 12v... 15A !?!?!? on: June 20, 2014, 05:17:58 am
well, clearly they can't transpose between Datasheet and Selling page.

Datasheet:  15.0mA supply current.
19  Using Arduino / General Electronics / Re: Reading a 120V AC powered relay state: problem with noise? on: June 14, 2014, 08:59:55 am
Point of note:    The original radio transmitters were made by creating a spark across a gap.  the relay can be good at creating a small version of this so in addition to creating a voltage transient, the relay can create an over the air spike that can be picked up at input pins.
20  Using Arduino / General Electronics / Re: 12V 2n2222 switching problems. on: June 12, 2014, 09:29:11 am
It was not said that you applied 12V to the base.  It was implied that you exceeded the Emitter to Base breakdown voltage by applying 12V to the Emitter when you should have attached the Led Strip and 12V to the Collector pin and instead connected the Emitter pin to GND. (as shown in my examples)
21  Using Arduino / General Electronics / Re: 12V 2n2222 switching problems. on: June 12, 2014, 07:05:11 am
Agreed.

Sadly, there are so many examples of how to do this correctly by using just a simple Google search.  Heck, I even have an example lying around... http://pwillard.com/files/LED.JPG   or http://pwillard.com/files/LED2.JPG  and in this configuratoin, the supply voltage (in my case 5V)  could be anything that won't fry the LED's or Transistor.
22  Using Arduino / General Electronics / Re: Can't get a momentary switch to work on: June 12, 2014, 06:54:01 am
http://www.jameco.com/Jameco/Products/ProdDS/153251%20Ver%20A.pdf

You are connected to the same connector on the switch... so it won't do anything when you press it.  move the lower wires to the OTHER SIDE of the breadboard gap and try again.
23  Using Arduino / General Electronics / Re: Power supply connection question on: June 04, 2014, 07:59:31 am
Quote
Good luck trying to find a 3-pin outlet in the USA.

really?   I don't have any non 3 in in my house,
24  Using Arduino / General Electronics / Re: Soldering alternatives on: May 31, 2014, 02:16:27 pm

I'm also up there... 2 years your junior.  I totally understand how the eyesight gets worse.

 I have LOTS of light and would do a horrible job if it were not for my Hakko FX-888 iron. They are not super expensive and  It makes me a pro.  A good iron will let you be a good solderer... a bad iron will make even  a good solderer do a poor job. 

My checklist:
 1) right temperature for the job  2) clean tip (I use sal amoniac to clean my tip if it has any built up deposits) 3) good solder with a decent amount of integrated flux.

Keepitsimplestupid nailed it... apply solder to the heated part of the items to be soldered... not where the tip is (or to the iron)

Crossroads (Mike), I swear we used to be neighbors (off elm street) before I moved.
25  Using Arduino / General Electronics / Re: Short circuit broke my Arduino Mega? on: May 27, 2014, 07:53:16 pm
The USB polyfuse is supposed to be self-resetting...  but... it's possible that the USB-SERIAL bridge IC did not survive.
26  Using Arduino / General Electronics / Re: Short circuit broke my Arduino Mega? on: May 27, 2014, 03:01:36 pm
The Ramps 1.4 board is designed to move the motor load far away from the arduino board itself... but it won't protect you from shorting the 5V rail.
27  Using Arduino / General Electronics / Re: Short circuit broke my Arduino Mega? on: May 27, 2014, 02:55:37 pm
I suffered a similar issue while building my 3d Printer (wired up the Endstop sensor board wrong) and created a short.

The fix was easy.  I un soldered the LDO 5V regulator and replaced it with a new one.  Works fine now.

The way to avoid it is to be super careful.  In my case, I had used a bad reference document.

Note: It was just chance that I caught it fast enough that only the regulator fried.
28  Development / Other Software Development / Re: No drop down menu scrolling in the IDE on: April 21, 2014, 10:59:38 am
A sad truth...  smiley-cry
29  Using Arduino / General Electronics / Re: snubber circuit capacitor and resistor? on: April 14, 2014, 05:41:57 am
1/4 watt resistors will be fine

400V Metalized Polyester is probably the best choice/price for the capacitor.

30  Using Arduino / General Electronics / Re: relay circuit won't work? Please help on: March 29, 2014, 12:49:39 pm
For schematic drawings, I use an excellent piece of "Windows" software call SPLAN from German based developer.  I think Eagle schematics are awful.  There is no need to use all that red color when a nice black and white drawing is fine.

It's a fine product.  Custom parts are easy to add.  Most people pass it of as "not for them" because It's not free.  It's aimed at hobbyists.  I've used it for nearly 10 years and am still quite happy.  It is NOT integrated with PCB software... it is a drawing tool and I like it that way.  There is a demo version to see if you like it.

http://www.abacom-online.de/uk/html/splan.html.

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