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1  Using Arduino / LEDs and Multiplexing / Re: using 4021 parallel shift register with internal pullup resistor on: July 25, 2014, 02:45:02 pm
http://media.tumblr.com/tumblr_m15ikhGfVK1qio1b3.png
haha, thanks for the answers!

The pullup resistor is so the input is at all times connected to one level or another and doesn't gets floating between values, right? I thought it could work as the bits that the register sends don't get floating also, but I guess it's not the same principle.
2  Using Arduino / LEDs and Multiplexing / using 4021 parallel shift register with internal pullup resistor on: July 25, 2014, 08:48:10 am
I need 8 buttons and thought of using a 4021 IC.
On every tutorial there's a pull up or down resistor for every button. would it be possible to just connect the buttons from 4021 to GND and instead use the arduino internal pullup on the DATA PIN?
Thanks!
3  Using Arduino / General Electronics / Help designing a bass booster for an Arduino synth on: July 24, 2014, 10:07:02 pm
I am programing a drum machine in Arduino with sequencer and everything and I am doing pretty well
I wanted to add some effects for it, and thought of a BASS BOOSTER so the bass drum could sound very fat and also a little distorted if the user wanted it (you can turn up the bass booster and lower the bass drum volume if it gets too loud).

I breadborded a circuit I found online:
http://circuit-diagram.hqew.net/Discrete-Bass-Booster-Circuit_4725.html


And it almost has the sound I am looking for, so it's fine for starters. As you turn P1 and P2 it goes from NO SOUND to a PUNCHY BASS SOUND.
Now, I want the user to be able to go from a DRY sound (not filtered) to a BASSIER sound (filtered and distorted) and this booster circuit only outputs the filtered sound.

It's not really what I wanted but I thought of using an op-amp as a mixer for the dry and wet output, the dry beeing always on and you can add bass by mixing the output as you turn a knob.

I then breadboarded this circuit:
http://www.experimentalistsanonymous.com/diy/Schematics/Buffers%20Switchers%20Mixers%20and%20Routers/Simple%20Mixer.pdf
and connected the dry output to one of the inputs and the wet output to another, but I am not getting both sounds at the same time, as you turn the P1 and P2 from the boost circuit it makes something strange: At one end you get full dry sound and at the other end you get the full wet sound, the weird thing is that at the middle point you get a VERY THIN sound, with no bass.

I also looked at "blender" circuits, but didn't tried yet.
What do you think???

Thanks a lot!

PD: attached an mp3 sample so you can hear it, it's a little quiet (doesn't has the bass boost!)
4  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
5  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

6  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!!!!!
7  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)
8  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!
9  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!
10  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
11  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.
12  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)


13  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
14  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?
15  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!
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