Search found 1191 matches

by MichaelN
Thu Apr 25, 2013 1:53 pm
Forum: BatchPCB
Topic: 0.02" Drill Size
Replies: 11
Views: 5536

Re: 0.02" Drill Size

codlink wrote:Oops, your [sic] write [sic]. My mistake.

You gotta [sic] admit though, my post was better than his.
Yep, your post was better than his :)
by MichaelN
Thu Apr 25, 2013 7:36 am
Forum: BatchPCB
Topic: 0.02" Drill Size
Replies: 11
Views: 5536

Re: 0.02" Drill Size

codlink wrote:Your [sic] actually in college and you right [sic] like that?
When you’re castigating someone for their writing style, you might want to check your spelling. Hint: it’s YOU'RE and WRITE.
by MichaelN
Mon Apr 22, 2013 5:52 am
Forum: SparkFun Product Questions
Topic: How would you make a gun cam??
Replies: 12
Views: 1421

Re: How would you make a gun cam??

I work with night vision scopes for guns at work. The #1 problem is gun shock. 40 pin SMT parts will get ripped right off the board in as little at 100 shots. Connectors come apart on their own. Batteries with spring contacts break connections. You name the weird problem and we have seen it. Are yo...
by MichaelN
Sun Apr 21, 2013 7:28 pm
Forum: SparkFun Product Questions
Topic: How would you make a gun cam??
Replies: 12
Views: 1421

Re: How would you make a gun cam??

Another issue I can think of is protecting the camera/electronics from the recoil of the shotgun. This is likely to be your biggest problem - the acceleration can be in the order of 1000G. Having said that, small and light items will likely have less problems, as the actual forces during a shot are...
by MichaelN
Sun Apr 21, 2013 7:27 pm
Forum: SparkFun Product Questions
Topic: Analog/Digital Zones, Vias with Multiple Voltage Levels
Replies: 2
Views: 375

Re: Analog/Digital Zones, Vias with Multiple Voltage Levels

... Having to split ground planes is if your board will carry analog and digital components... I have made a few boards in my day, I have yet to have a defective board because I didn't split the grounds. I know there are several dedicated analog and digital chips that need to have there own ground,...
by MichaelN
Thu Apr 18, 2013 11:27 pm
Forum: BatchPCB
Topic: Done With BatchPCB
Replies: 4
Views: 4381

Re: Done With BatchPCB

Try Seeed or iTead. Cheaper and quicker.
by MichaelN
Tue Apr 09, 2013 1:54 am
Forum: SparkFun Product Questions
Topic: Extremely Low Power Regulators ~0.2mA
Replies: 6
Views: 991

Re: Extremely Low Power Regulators ~0.2mA

What's your input voltage? You say you want 5V and 3.3V regulators - I assume you want 250mA @ 3.3V; what current do you need at 5V?

Micrel make some nice low-power LDOs, but the max input voltage for most of them is 5.5V (you'll find this is an issue with other manufacturers too).
by MichaelN
Sun Apr 07, 2013 2:59 pm
Forum: Arduino
Topic: Arming ESC with Arduino Uno
Replies: 14
Views: 13430

Re: Arming ESC with Arduino Uno

Correct me if I'm wrong, but if I arm the ESC's with a transmitter won't' I have to re-arm them every time I put power to the ESC's? Basically, if I arm them with a transmitter will they be good to go on programming them? The idea was to make sure the ESCs hadn't been damaged, and that the rest of ...
by MichaelN
Sun Apr 07, 2013 6:01 am
Forum: Arduino
Topic: Arming ESC with Arduino Uno
Replies: 14
Views: 13430

Re: Arming ESC with Arduino Uno

I turn on power and hear 3 quick "Beep beep beep" then it sits for 2 seconds or so and then beeps roughly 1 beep per second. Sounds like it's waiting for a series of valid "minimum" pulse widths (1ms wide). Have you hooked up an oscilloscope to check the pulses you're sending? Have you tested it wi...
by MichaelN
Thu Apr 04, 2013 5:11 pm
Forum: PCB Design Questions
Topic: Insulate and protect PCB
Replies: 4
Views: 1326

Re: Insulate and protect PCB

Rather than a silicone-based conformal coating, I'd suggest a PCB lacquer that can be soldered through if needed later. Even RadioShack-type stores should carry this. Hot glue might be OK, and has the advantage that it can easily be removed with isopropyl alcohol.
by MichaelN
Thu Apr 04, 2013 9:02 am
Forum: SparkFun Product Questions
Topic: Switching 12V with 3.3V with minimal power loss.
Replies: 5
Views: 1155

Re: Switching 12V with 3.3V with minimal power loss.

In which direction should the diode be connected, the flat side to positve or to gnd, I am going to assume to positve? Correct. Also why the diode, what will it do for me? It provides a path for the current when the MOSFET switches off. There is energy stored in the inductance of the solenoid when ...
by MichaelN
Thu Apr 04, 2013 12:08 am
Forum: SparkFun Product Questions
Topic: Switching 12V with 3.3V with minimal power loss.
Replies: 5
Views: 1155

Re: Switching 12V with 3.3V with minimal power loss.

You're using 12VDC (not 12VAC), right? What you did is OK, but you should have a reverse diode (as well as the capacitor you used) across the solenoid coil. You could replace the darlington transistor with an N-channel MOSFET if you want to save a small amount of current. This would need to be a "lo...
by MichaelN
Tue Apr 02, 2013 5:59 pm
Forum: Arduino
Topic: Angle Meter
Replies: 7
Views: 836

Re: Angle Meter

Accelerometers are generally good at this type of thing, and would eliminate the need for switches / encoders etc (which could be prone to water / dirt ingress.
by MichaelN
Fri Mar 29, 2013 6:02 pm
Forum: Arduino
Topic: Arming ESC with Arduino Uno
Replies: 14
Views: 13430

Re: Arming ESC with Arduino Uno

How does this wiring diagram look? Red = power Black = ground Green = signal Do I need a load resistor? You need to make sure the GND of the Arduino is tied to the GND of the 7.4V PSU. Depending on the power supply and length of the power leads, you might like to add some capacitors close to the ES...
by MichaelN
Wed Mar 27, 2013 8:01 pm
Forum: SparkFun Product Questions
Topic: General Design Questions for a Widget
Replies: 15
Views: 1126

Re: General Design Questions for a Widget

I also forgot to mention that the peak voltage of a rectified 120VAC is almost 170V. If you have a filter capacitor after the rectifier, you'll see almost 170VDC unloaded - probably too much for a 115VDC motor.