Search found 1191 matches

by MichaelN
Mon Mar 11, 2013 5:35 pm
Forum: New Product Ideas
Topic: how about a hearing aid kit ?
Replies: 4
Views: 1813

Re: how about a hearing aid kit ?

Modern hearing aids are technological marvels, containing advanced digital signal processing in tiny packages that consume hardly any power. The manufacturers use custom ICs that aren't available to other companies. Also, I believe that these tiny hearing aids are generally custom molded to the user...
by MichaelN
Mon Mar 11, 2013 5:26 pm
Forum: BatchPCB
Topic: 0.02" Drill Size
Replies: 11
Views: 5540

Re: 0.02" Drill Size

whitnasty1 wrote: The drill size is 0.02", the outer and inner layer diameters are 0.036. ...the minimum drill size stated on BatchPCB's website for 2-layer boards is 20mil.
You answered your own question - not sure what you're worried about.
by MichaelN
Wed Mar 06, 2013 6:02 pm
Forum: SparkFun Product Questions
Topic: Battery powered + 3.3V regulator
Replies: 8
Views: 985

Re: Battery powered + 3.3V regulator

I’d say a step-up / step-down regulator is overkill, and would suggest a switching step-down (buck) regulator, or just LDO (Low Drop-Out) regulator instead. If you’re using 4 X AAA batteries, then they are almost completely flat when they reach 3.3V anyway. The choice to use a buck regulator vs. LDO...
by MichaelN
Wed Mar 06, 2013 5:51 pm
Forum: Arduino
Topic: Fio V3 USB jack - fragile?
Replies: 2
Views: 472

Re: Fio V3 USB jack - fragile?

Not that this helps you, but this sort of thing is why I hate using SMD connectors. When I’m forced to use them, I generally modify the manufacturer-recommended footprints to reduce the chance of pads being ripped off. This can even include adding a bunch of vias to “tie” the pads to the bottom laye...
by MichaelN
Wed Feb 27, 2013 5:33 am
Forum: AVR Microcontrollers
Topic: Fastest Microcontroller
Replies: 8
Views: 8244

Re: Fastest Microcontroller

But pi comes out with lot of other peripherals like hdmi cable and other stuff. Also I would need to use a external memory card. So if there is a way I can get a customized one out of pi which can use this BCM2835 and have a usb HS connector and a pin out to say led light to indicate alone that wou...
by MichaelN
Wed Feb 27, 2013 5:26 am
Forum: BatchPCB
Topic: Big drill vs rout/milling?
Replies: 5
Views: 3893

Re: Big drill vs rout/milling?

spamiam wrote:I can create a similar cut-out using 2.2mm drills overlapped just enough to achieve high spots that leave a gap of 2mm
Many PCB places won't allow overlapping drill holes, as they can break drill bits.
by MichaelN
Tue Feb 26, 2013 6:56 pm
Forum: AVR Microcontrollers
Topic: Fastest Microcontroller
Replies: 8
Views: 8244

Re: Fastest Microcontroller

Depends what you mean by "microcontroller". The Raspberry Pi uses a Broadcom BCM2835 "system on a chip" (ie, lots of integrated peripherals as well as the CPU), and can be run at 1GHz. Probably a good choice for a new design, given the amount of code out their being written for the Pi.
by MichaelN
Tue Feb 26, 2013 6:31 am
Forum: BatchPCB
Topic: Big drill vs rout/milling?
Replies: 5
Views: 3893

Re: Big drill vs rout/milling?

So maybe the slots for the ACS756 will work and maybe the round holes will not? If they can do slots, they should be able to do round holes - both would use the same router bit. The only difference is that an 11mm hole would leave a small cutout piece instead of just dust - I don't think that would...
by MichaelN
Mon Feb 25, 2013 5:15 pm
Forum: BatchPCB
Topic: Big drill vs rout/milling?
Replies: 5
Views: 3893

Re: Big drill vs rout/milling?

You need to talk to your fab house or look at their FAQs. Typically this would be drawn in the same layer as your PCB outline (ie, milling layer), but might need a special note as well. 11mm is way too big to drill out.
by MichaelN
Mon Feb 25, 2013 5:11 pm
Forum: OpenOCD
Topic: build on Windows 7 failed
Replies: 1
Views: 755

Re: build on Windows 7 failed

You're more likely to get a response if you provide details of the application / compiler you're using (including versions, settings etc) and generally give context of what you were trying to achieve...
by MichaelN
Sun Feb 24, 2013 6:46 pm
Forum: SparkFun Product Questions
Topic: Driving multiple leds with µ-controller in smart way...
Replies: 2
Views: 396

Re: Driving multiple leds with µ-controller in smart way...

If you only ever want to switch them all at once, a single MOSFET or BJT will do. As dlotton suggests, low-side switching is easier. If you need individual control, I suggest using a driver chip such as ULN2803.
by MichaelN
Fri Feb 22, 2013 12:21 am
Forum: Arduino
Topic: SN754410 overheating
Replies: 3
Views: 483

Re: SN754410 overheating

Are the stepper motors running? If so, I'd expect it to get warm, but not "very hot, very fast". If not (or you haven't got that far), it sounds like you may have a wiring fault or damaged chip.
by MichaelN
Thu Feb 21, 2013 11:55 pm
Forum: SparkFun Product Questions
Topic: Whine from Car Engine on Audio Amp Kit
Replies: 10
Views: 1191

Re: Whine from Car Engine on Audio Amp Kit

http://www.mouser.com/ProductDetail/Schaffner/EV35-20-02-20M/?qs=%2fha2pyFaduhG99acNs2o96y8L7peOLM9y%252bFaUx2S7NGhWH%2f6EchmIg%3d%3d That is the link to the mouser page. It is part number EV35-2.0-02-20M. OK, that’s a common-mode filter, and the inductors are coupled together. You would connect th...
by MichaelN
Thu Feb 21, 2013 9:39 pm
Forum: SparkFun Product Questions
Topic: Whine from Car Engine on Audio Amp Kit
Replies: 10
Views: 1191

Re: Whine from Car Engine on Audio Amp Kit

Alright, I got a 20mH inductor from mouser but it looks like it's actually two 10mH inductors in one part so, would it be a better filter if I used the two 10mH inductors in series to make one 20mH inductor and only one pi filter, make two pi filters with both of the 10mH inductors and 3 10000 uF c...
by MichaelN
Tue Feb 19, 2013 1:01 am
Forum: Arduino
Topic: arduino uav
Replies: 6
Views: 563

Re: arduino uav

boynicho wrote:i just need a head start.
Then you'll need to provide a LOT more information first, as Skye stated...