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General Chat / Re: Show your favorite and most used benchtop PSU
« Last post by c4757p on Today at 10:41:52 PM »
You're fucking with us, right Whales? Please tell me you are.

At least round off the tops...
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General Chat / Re: Average age of EEV user
« Last post by jpb on Today at 10:40:42 PM »
Combine 0-10 and 11-20 to > 20 and eliminate the 100+ because, and you know it, it's just a joke option.  I have a feeling that you're going to get quite a few 51-70's here but I'll bet the overall average is 41-50.
Are you the one voted 100+!
Removing the 100+ makes sense, replacing it with 71+ so you can have 51-60 and 61-70. The 0-10 doesn't seem very popular but I think is worth leaving in.
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General Chat / Re: The Israelis do it again!
« Last post by Kohanbash on Today at 10:39:34 PM »
Just to point out that out of 2743 reviews the seller has a 99.7% positive feedback.
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Beginners / Re: increase power of NRF24L01 radio
« Last post by 8086 on Today at 10:35:41 PM »
Sort of off-topic, but does anyone know why the Elecfreaks module only claims 1000m range in ideal conditions with +20dB gain, while the XBee Pro ZB claims 3400m range and +18dB gain?

Is it simply a case of...better engineering? They seem to otherwise be the same or very similar (data rate, etc).

"Range" is non-scientific.  It can be anything they want it to be, depending on many other variables.

 Antennae gain values are approximates AFAIK -- their exact patterns are more complicated than a cone model.  *not an RF engineer*

EDIT:
Quote from: Wikipedia
When no direction is specified, "gain" is understood to refer to the peak value of the gain. A plot of the gain as a function of direction is called the radiation pattern.

So you reckon they are simply referring to different points on their radiation patterns?

One being optimistic and one being conservative?

Still seems like a huge difference in range, wouldn't you think they would both use their maximum value?
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General Chat / Re: I Smell Sensationalism
« Last post by VK5RC on Today at 10:33:24 PM »
I don't know how sensitive most cardiac pacemakers are to EMP but about 10% misbehave (usually not critically) with a standard mobile phone placed directly above the pacemaker wire.
I recall hearing that one of the MIG fighters had a thermionic valve front end to be able to tolerate a bit more EMP up the front end.
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Beginners / Re: increase power of NRF24L01 radio
« Last post by pereczes on Today at 10:31:48 PM »
If your targets are not moving, using a higher gain antennae may be easier.  The kiwis have excelled at using this to pick up wifi from several Km away :D


really lovely tutorial. What I need is "mobile" mc based devices that I can easily move around. The basic one has bad reception through walls.  Was thinking to boost it if possible with simple circuitry

How much amplification are you looking for? Elecfreaks has a version with small amplifiers (20 dB for transmit, 10 dB for receive I think).


can you please post a link if possible?
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General Chat / Re: Show your favorite and most used benchtop PSU
« Last post by switcher on Today at 10:29:33 PM »
WOW! I wouldn't want to fall asleep at the bench using that PSU!
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What about measuring uCurrent? :)
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General Chat / Re: Snake oil
« Last post by Whales on Today at 10:21:15 PM »
That reminds me of the hotel demonstration scam from the 50's where tap water from the hotel bathroom was turned into petrol by the addition of the magic compound. The trick was that petrol was first pumped back up the hotels plumbing before the press presentation then of course when the water was run from the bath petrol came out at first. It caught a lot of people though before the guy got caught.
I'd hate to be the guy who owns the hotel.

Client: My toilet caught fire, and I tried to put it out with water from the sink.  Does this normally happen?
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Wohoo! Vias under D2PAKs - I've been doing that for years and everyone keeps telling me it's like totally WAY bad. Now I feel vindicated!  :phew:

Awesome bit of kit that...
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