Search found 1191 matches

by MichaelN
Mon Aug 24, 2009 2:14 am
Forum: New Product Ideas
Topic: Need help id'ing cable
Replies: 2
Views: 721

I think you mean "FPC". Depending on the pitch, you may be able to get a connector to suit from Digikey. I know you say it is "0.1 pitch", but from the photo the pitch looks a LOT less than 0.1".
by MichaelN
Sat Aug 22, 2009 6:03 pm
Forum: PCB Design Questions
Topic: how to dispense solder paste?
Replies: 3
Views: 973

Try small syringe + inkjet refiller needle

I've found the best method (apart from using a laser-cut Mylar / Kapton stencil) is to use a small (1-3cc) syringe, with the needle from an inkjet refilling kit (after cleaning with alcohol). Normal hyperdermic needles tend to be way too fine to allow solder paste to flow.
by MichaelN
Sat Aug 22, 2009 5:59 pm
Forum: PCB Design Questions
Topic: Reflow regular solder with skillet
Replies: 5
Views: 1286

Cheap solder paste

If you're really worried about cost, just get something like this ($3.57 including shipping from Hong Kong):
http://www.dealextreme.com/details.dx/sku.4711

(Note that some of the stuff these guys sell as "solder paste" is actually just flux)
by MichaelN
Wed Aug 19, 2009 1:06 pm
Forum: BatchPCB
Topic: Commercial Reflow ovens for Hobbyists
Replies: 22
Views: 28025

Looks good...

That looks exactly the same as a unit a friend of mine got from China. His unit works very nicely, and is now being used for small-scale manufacturing. I'd say the best idea would be to Google for comments on a particular supplier you're looking at, but in general these ovens look like a good way to...
by MichaelN
Mon May 11, 2009 5:16 am
Forum: SparkFun Product Questions
Topic: reverse polarity protection (shunt diode)
Replies: 7
Views: 3458

Try using a logic-level MOSFET instead of a schottky diode to reduce the voltage drop. A schottky still has 0.3V or so drop, but a MOSFET can have essentially zero drop (this can be important for battery powered applications). To use an N-channel MOSFET, connect the drain to the negative battery ter...
by MichaelN
Fri May 08, 2009 6:20 pm
Forum: SparkFun Product Questions
Topic: ultrasonic sensor
Replies: 5
Views: 1105

I'm not sure what your application is, but if you're looking to use the ultrasonic sensor as a "microphone", bear in mind that most of them have a very limited bandwidth. Most of the time they are used on a fixed frequency. I assume some manufacturers make "wide" bandwidth types, but they would be h...