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1  Using Arduino / General Electronics / Re: [SOLVED] Nano using 9v on Vin works weird on: August 23, 2013, 05:07:59 pm
I finished it!
Thanks again, here it is if you want to take a look at it...
http://forum.arduino.cc/index.php?topic=184158.0

I think it has quite an original sound
2  Community / Exhibition / Gallery / Auto Obstinato Synth (Arduino Mozzi + filter & fuzz) on: August 23, 2013, 05:06:58 pm
Digital synth capable of generating random sounds and melodies made with Arduino Nano and Mozzi library, sent to a LP filter and fuzz circuit.

Hope you like it!
I own a lot to the Arduino community! smiley

3  Using Arduino / General Electronics / Re: Nano using 9v on Vin works weird on: August 18, 2013, 05:00:19 pm
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No no, everything has common ground! Im using only the one on the power supply, also I'm probing on the audio output of the schematic (on the right)
Check that the wiring is actually making contact. What you describe is classic no common ground.
Sorry but there you are.
Maybe a photo of your setup?

What an idiot... I forgot to ground the audio output  smiley-red
For some reason when using USB power the audio doesn't needs a ground (when connected to the same PC I suppose)

THANKS to you all!!!!!
4  Using Arduino / General Electronics / Re: Nano using 9v on Vin works weird on: August 17, 2013, 05:58:48 pm
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How about your common grounds. Is the grounds connected when using battery, or just when using USB ?
I don't use a battery, I'm using a 200mA 9V power supply, I just connected GND to ground but I think I also tried connecting it to GND1 also.

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The 5V coming through USB is filtered.  Though the 9V should not be noisy enough to create what you are describing.

You can try adding 0.1uF and/or 4.7uF caps between Pos and Neg close to the battery.
This also applies to a power supply?

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If the regulator went to thermal shutdown, it would be off for a while.
But if there was not a common ground, it  cold produce such symptoms.
Where's the OP. Maby they have a hopping weekend, and left us till Monday.  LOL
why a thermal shutdown? It's not that the Nano goes off, it just produces a noise audio output. Also tried a blink program and it works fine with the power supply only.
Could it be that is a noise power supply? Is there a way to reduce that? Maybe with a capacitor as said above?
I'm sorry, I haven't been in the PC all this time to answer!!!  smiley-lol

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The strange thing is that when I touch the USB input of the Nano with the outside of the mini USB plug that is connected to the PC it works fine
That means you haven't got a common ground between your arduino and your audio circuits.
No no, everything has common ground! Im using only the one on the power supply, also I'm probing on the audio output of the schematic (on the right)
5  Using Arduino / General Electronics / [SOLVED] Nano using 9v on Vin works weird on: August 17, 2013, 11:50:57 am
I'm doing a little synth with a Nano and some other stuff (filter & fuzz)
When I connect it by USB it works fine and produces sound, but when I connect 9v (also tried 12v) on the Vin pin, it works but the output is faint and there is a lot of noise.
I must say that I'm probing the output after the Nano, before getting to the filter and fuzz.

The strange thing is that when I touch the USB input of the Nano with the outside of the mini USB plug that is connected to the PC it works fine, without reseting or anything, just by those two touching the noise dissapears, removing it noise comes back.

I'm attaching the schematic!

Heeeeelppp pleeeasee! Thanks!
6  Using Arduino / General Electronics / help with audio thru on: May 28, 2013, 06:35:57 pm
For a project I need to amplify the audio connected to "Input", while getting the same signal in the input to get straight to "Audio Thru".
"Audio Thru" needs to be the same signal that is going in on "Input".
And also "Input" needs to get converted from stereo to mono.

Is the connection on blue ok? Do I need to connect some resistors... somewhere??

Thanks!
7  Using Arduino / General Electronics / Re: Touch panel (made with PCB) on: May 06, 2013, 09:20:24 pm
mmm.... maybe something like this?: http://playground.arduino.cc//Main/CapacitiveSensor?from=Main.CapSense
but on this example you need 2 pins and I can see that that Touch&Spell has only one for the pitch control
8  Using Arduino / General Electronics / Touch panel (made with PCB) on: May 06, 2013, 08:23:25 pm
I stumbled upon this: http://casperelectronics.com/finished-pieces/speak-n-spell/touchandspell/
And was wondering how that touch panel made from conductive material works?
How can this be implemented in Arduino? I am more interested in the pitch control, if you connect it directly to an Arduino pin would you be able to do an analogRead and that's all?
Great webpage by the way.
9  Community / Exhibition / Gallery / Re: Simple Colour Change Lamp on: May 05, 2013, 10:57:00 am
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Apart from using different MOSFET and resistor values the circuits are the same
I mean the shaded parts, it says on the webpage that those parts are for "adding PWM input support", I built it without those parts and still works (even if it blinks a little when PWM is low)


10  Community / Exhibition / Gallery / Re: Simple Colour Change Lamp on: May 04, 2013, 10:22:04 am
What is the difference between the circuit you linked and this one?: http://www.tbideas.com/blog/build-an-arduino-shield-to-drive-high-power-rgb-led/
Yours has extra parts for beeing PWM friendly as it says on the page, but I really don't understand the explanation.
I did mine and I noticed that when PWM level is low the led blinks a little, I really don't know if it will bother with the other colors turned on, need to test that.
Do you think adding those extra parts will solve that?

Thanks
11  Using Arduino / General Electronics / Re: Help with schematic (changing GND to 6v) on: May 04, 2013, 09:48:19 am
So if I only need to connect just one colored 10 watts led per driver do you think it's better to just have R1 and Q1?? Something like that?
One thing I noticed is that with a low width PWM (when the color should be off) it blinks a little. What do you think about that?
12  Using Arduino / General Electronics / Re: Help with schematic (changing GND to 6v) on: May 03, 2013, 07:54:40 pm
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That will work better using a voltage regulator for the Red.
Can you snip off the top of the device so you have seperate anodes for the 3 LEDs?
Then you can have 12V for Green & Blue, and regulated 8V for the Red, and the cathodes can connect to your circuit above.
You know what? I never tought trying to separate the anode of each led, but it can be done!!! That solves a problem. I tryed and now each color has it's own anode.
Sorry I forgot to add that it was a simplified circuit, instead of a resistor each color has it's own driver.

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I would switch to a forum where they didn't tell you such rubbish.
For a start that is not a proper circuit and second you always need one resistor per LED.
hahaha, a genuine Grumpy Mike! I think that forum is this one! Great community!

Thanks, you all!! I think I have everything covered!
13  Using Arduino / General Electronics / Re: Help with schematic (changing GND to 6v) on: May 03, 2013, 02:07:27 pm
I think this is the way to go, as someone in another forum told me:
I was thinking in getting 6v from 12v with something like this: http://schematic-audio.blogspot.com.ar/2011/10/dc-converter-using-7808-regulator-ic.html

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Why so convoluted?
Just drive with 3 logic level, low Rds, low Gate capacitance, N-channel MOSFETs
http://www.digikey.com/product-detail/en/NTD5867NL-1G/NTD5867NL-1GOS-ND/2401422
10k pulldown resistor to hold gate off while arduino starts up.
well... that will replace the whole circuit, right? I am certain that will not be able to find it here on my country (Argentina) :-(
14  Using Arduino / General Electronics / Re: Help with schematic (changing GND to 6v) on: May 02, 2013, 09:48:25 pm
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question is...

how much current to power the led is required?

that circuit is overkill... and yes the same circuit would be fine, r2 is doing the work to protect the diode.
Ok, the led is this one: http://www.alibaba.com/product-gs/712130845/10_Watt_RGB_LED_high_power.html
it is a high power RGB and as you can see on the table you need around 12v for BLUE and GREEN but you need around 6v for RED, and also the leds have a common positive pin.
As this is the case, I need to connect 12v on the positive side, and I was thinking that I could connect 6v on the negative side of RED instead of 0v so it has the required voltage.

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Where's the 6V coming from?  If you have a 6V supply, why don't you use it directly instead of trying to subtract?
I only have a 12v power source and I was thinking getting 6v from it with a voltage divisor (resistors), the question is if it will work connecting the RED driver to Vcc->12v and GND->6v.

The schematic I referenced on the first post is a led driver and I need one for each color (RGB, so three of them)
15  Using Arduino / General Electronics / Help with schematic (changing GND to 6v) on: May 02, 2013, 05:32:44 pm
Ok, I needed a driver for a 12v led and did this:
(full article explaining everything: http://www.tbideas.com/blog/build-an-arduino-shield-to-drive-high-power-rgb-led/
Vcc connected to 12v and of course GND to 0v.

It works fine, but now I need the same thing but instead of driving a 12v led I need it to be 6v, but the thing is that because of design Vcc still needs to be connected to 12v.
My question is: Can I connect GND to 6v so the voltage difference of the led is 6v??? (12v-6v=6v)
Also do I need to change anything on the circuit??

Thanks!
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