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421  Using Arduino / Project Guidance / Re: Arduino Uno running in a car on: February 22, 2014, 04:01:52 am
Do MOV (Metal oxide varistor) get produced for low voltage ?   - if the same principal applied to the 120/240ac versions but only in low voltage DC form, that could be used to protect the circuit from voltage spikes.

422  Using Arduino / Project Guidance / Re: An arduino dial up modem? on: February 22, 2014, 03:59:38 am
Nope, turning it into one....

423  Using Arduino / Project Guidance / An arduino dial up modem? on: February 22, 2014, 02:21:14 am
Obviously there would be little use for one... but what about feasibility?   Would a 56k (or slower) modem be possible?
424  Community / Bar Sport / Re: Calls "from windows" about "online hackers inside your computer". on: February 21, 2014, 11:50:25 pm
I've always built my own machines so I'd never fall for it  .

But I'd love to have some fun with a scammer over the phone, I'd feed them false information and have some fun!
425  Using Arduino / Project Guidance / Re: Motion detecting to turn on device on: February 21, 2014, 07:06:03 pm
Yes you could....

Desktop or laptop?  (WOL / wake on lan) or button press
Ceiling light - a simple relay .

426  Using Arduino / General Electronics / Re: SSOP to DIP adaptor on: February 21, 2014, 10:40:12 am
427  Using Arduino / General Electronics / Re: SSOP to DIP adaptor on: February 21, 2014, 10:36:06 am
I have a sop8 & sop16 adapters, you drop the chip in which grabs it with a spring and then drop it into your breadboard, no soldering required.
428  Using Arduino / General Electronics / Re: Need idea for voltage threshold switch solution on: February 21, 2014, 10:31:01 am
The transistor is the way, instead of a voltage divider, a zener diode placed backwards on the base pin would keep the transistor off  until the reverse breakdown voltage takes place switching your circuit on, a darlington transistor or possibly a schmitt trigger to keep a clean transition between off and on.
429  Using Arduino / General Electronics / ftdi chips fake vs real on: February 20, 2014, 11:08:28 pm

I have wondered, as some chips I've felt iffy about and this article confirms my suspicions about some ebay dealers!
430  Using Arduino / Project Guidance / Re: 1 input - 3 outputs. on: February 20, 2014, 09:18:49 am
You need to take a break judging by the code smiley

Simplify it, break it down.... what I'm confused over is this supposed to be a set pattern? Since there's only one button? Eg  123, 321, 123 looped over and over?

431  Using Arduino / Project Guidance / Re: Consultation required on Arduino powered Android controlled car on: February 20, 2014, 09:09:36 am
A way of amplifying your signal.. transistors or a darlington array or fets... then protection in the form of a flyback diode for inductive spikes which can kill your transistors/uno.
432  Using Arduino / Project Guidance / Re: You have a way to go! on: February 20, 2014, 09:06:23 am
That's a little overkill.... but yeah that would work fine.

Umm, no, it won't!  smiley-eek

The reason for the Zener in my circuit is to protect against over-voltage to voltage regulator input


Well now, firstly you have the Zener the wrong way round - it will simply directly conduct and blow the fuse.

So, connect it the right way round?  No.  You specified a 1N4732, which is a 4.7V Zener which will again, conduct heavily and blow the fuse.  Were you even to connect it to the output of the 9V regulator (or even a 5V regulator), it would draw a heavy current and shut down the regulator.

Arguably, a 1N4745 specified at 16V would be appropriate.  On the other hand, better to make it more like 27V, a 1N4750 which will clamp at a voltage the regulator is stil rated (35V) to handle comfortably (at least as a transient).

I did not see a zener voltage so I figured it was a fast switching diode.. my bad
433  Using Arduino / General Electronics / Re: Problem of Arduino sharing ground pin on Darlington array chip ? on: February 20, 2014, 04:09:57 am
Placing a diode backwards across the motor will help reduce spikes, I stay away from motors but some people place a small ceramic across the motor  (not entirely sure except  protecting the electronics?)
434  Using Arduino / General Electronics / Re: 5v not working on: February 20, 2014, 02:57:31 am
Powering it all from 1 pin? Which pin?

If it's the 5v  / usb pin then you're going to need an external power supply.
435  Community / Bar Sport / Re: whats with the attitude on: February 19, 2014, 03:47:24 am
I don't care ... you get the service you pay for!
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