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421  Using Arduino / General Electronics / Re: criticism over my circuit.. on: April 17, 2014, 06:29:12 pm
Not at that moment in time lol .. sorry
422  Using Arduino / General Electronics / Re: criticism over my circuit.. on: April 17, 2014, 02:19:44 pm
They missed the point (as most do in this field) that the 5v source could simply be a 5v signal from any logic voltage source, no arduino required oh well.
423  Using Arduino / General Electronics / Re: criticism over my circuit.. on: April 17, 2014, 02:16:26 pm
Hmmm, here's the response. ..

424  Using Arduino / General Electronics / Re: criticism over my circuit.. on: April 17, 2014, 01:34:57 am
Here's the screen shots, I've also publically released it to everycircuit's community for other hardware designers to see..

But it's very low power smiley thanks
425  Using Arduino / General Electronics / Re: criticism over my circuit.. on: April 16, 2014, 11:16:17 pm
Nice!..... thanks I'll stick it into the simulator and checkit out smiley
426  Using Arduino / General Electronics / Re: Need a battery source on: April 16, 2014, 10:42:12 am
I've soldered tabs with a regular iron, just be quick about it...

I put a 16340 cell by accident wired directly to a switching regulator (pumping over 2 amps in for a good 20 minutes) , by the time I realized, the cell was a mini oven, which I quickly tookoutside... lithium cells can take a beating and are not as risky as most people portray them to be! But still I'd never leave the home alone with them charging, except my arduino charger which feeds 150ma cc/cv, it's slow but the batteries thank me for it, less heat less energy waste more cycles better battery life etc..

427  Community / Bar Sport / Re: The next big thing in battery technology on: April 16, 2014, 08:39:36 am
This one's good for a chuckle:

http://www.iflscience.com/technology/quantum-dots-can-charge-your-smartphone-30-seconds

Uhhhhh huh.  2000mAh or so in 30 seconds?  Sure, sign me up.  smiley-roll  Now all I need is a USB port capable of providing 240A at 5v.
1000mAh in 10 minutes would already be great  ==> a small drive in your car -> 50% charged phone

What I would like is a phone battery that I can exchange with a full one without my phone resetting.
In practice that would mean a smaller battery and a big capacitor in myPhone.
And it would be even more great if these batteries were standardized (over all models) so I could buy them at every corner for $10 or for $1 when I return my empty one (so it can be recharged)


You might be on to something with that post, what about a smaller toy helicopter sized lithium battery concealed away to allow a battery swap without it resetting? Sounds easy enough?

As for the battery charging, that's some heavy current shifting...
428  Using Arduino / General Electronics / Re: criticism over my circuit.. on: April 15, 2014, 10:18:50 pm
Paul, where does it state it has to be Arduino related? This is /general electronics/

And indeed it is, but given that it is an Arduino forum, one does kind of expect it to be "general electronics matters used in conjunction with Arduinox".   smiley-grin


You better get busy then, there's hundreds of posts not related to an arduino in any way shape or form... feel free to start here in general electronics and move into off topic last and let everyone else know their posts are not Arduino related!
429  Using Arduino / General Electronics / Re: criticism over my circuit.. on: April 15, 2014, 09:37:22 pm
Poly, I thought about using a 555 or logic chips, I'm trying to develop my bare metal skills is all...  if it had of been say 12v in and if the power went out, a simple pnp would handle it..

But because I want the 5v to control the circuit, a 5v high would not switch off a pnp when the emitter has 12v on it..

I was after criticism of this circuit, alternatives would be quite simple I have a draw full of logic chips to do such a job, but it's about learning,  I could add schmitt trigger in transistor form...


Paul, where does it state it has to be arduino related? This is /general electronics/
430  Using Arduino / General Electronics / criticism over my circuit.. on: April 15, 2014, 07:35:24 am
I just designed a power out circuit, if power goes out the 12v  lead acid battery kicks in...

After several redesigns, my main issues were due to using too much current when the power was on, 100k worked fine but resulted in the transistor switching the led on was not saturated, so I used another transistor  too boost the signal..

Anyway, the critiques among you will surely point out the flaws in my design, please do, once the final design is made I'll move it to perfboard for a blackout light.  smiley-eek

Edit, helps to include the cicuit!

My issues are reducing the current when the 5v supply is on....

431  Using Arduino / General Electronics / Re: pnp transistor array with common emitter on: April 14, 2014, 07:14:52 pm
Why can't you use npn's?

Certainly easier to control from your arduino.
432  Using Arduino / General Electronics / Re: Measure a battery amps on: April 14, 2014, 07:07:34 pm
I ended up building my own lithium ion charger circuit using simply 5v, arduino powered.
433  Using Arduino / General Electronics / cheap n nasty lithium battery chargers... on: April 13, 2014, 10:47:44 pm
Out of curiosiry I bought a 2 dollar charger... save yourself  a dollar and buy some matches.

The curious thing is the ic chip they used, check it out lol
434  Using Arduino / General Electronics / Re: Transistor's base voltage.. on: April 13, 2014, 08:34:19 am
Runaway, are you sober?
435  Using Arduino / General Electronics / Re: Transistor's base voltage.. on: April 13, 2014, 08:17:35 am
Are you saying up to 50v can be applied to the base?..  smiley-cool
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