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1  Using Arduino / General Electronics / Re: Transistor Base Resistor Choices? on: May 13, 2012, 06:06:52 am
you have to pick the the from data sheet.
2  Using Arduino / Motors, Mechanics, and Power / Re: Adafruit Motor Shield code help! on: May 10, 2012, 04:33:19 pm
switch(results.value)

  {

    case 0x70: Serial.println("Menu/Exit");
    digitalWrite(13, HIGH); // here you can put on or off your motor
     break;

Got it???
3  Using Arduino / Motors, Mechanics, and Power / Re: Can I use an AC/DC converter for the arduino UNO? on: May 10, 2012, 04:22:39 pm
What do you want to do?
4  Using Arduino / General Electronics / Re: help on dual dc supply on: May 10, 2012, 03:40:25 pm
this is a good solution
5  Using Arduino / General Electronics / Re: SOLAR ENERGY on: May 01, 2012, 03:00:28 pm
I did a project that:
1-Make a calculation of total power of 4 x 180 watt cell then is exported to a excel 
2-swicht the cell form all in parallel to 2 in series in parallel with 2 in series when the sun is not enough
for increment the output power

6  Using Arduino / General Electronics / Re: Amplifying signal with a Transistor? on: May 01, 2012, 02:14:50 pm
The circuit that DVDdoug gave you will make a lot of distortion .If you want to make a true Class A amp yo have to use other circuit
1- Use capacitor in the input to avoid dc got direct to  transistor.
2 Use any trick to avoid DC go into Speaker.

Ok the easy way is to use Darlington transistor connection for example TIP 140

 
7  Using Arduino / General Electronics / Re: Can you get a negative and positive voltage out of the same source? on: May 01, 2012, 08:41:32 am
there are several forms to do it, this one is very simple way
Check the diagram
8  Using Arduino / General Electronics / Re: Cannot read signal from flow meter on: April 15, 2012, 05:08:41 pm
1_ test the arduino side: Check connecting the pin2 to something else like switch and see if you can read it
connect if to 5 v and then to 0.

2- Check the flow sensor: put to water circuit and check volts between yellow and black cable.
9  Using Arduino / General Electronics / Re: Connecting a micro switch to a coil on: March 14, 2012, 03:52:24 pm
Why do you send the diagram?
10  Using Arduino / Programming Questions / 8 bit ports in Arduino MEGA on: March 11, 2012, 04:21:18 pm
how to use 8 ping as full 8 bit ports in arduino mega?
11  Using Arduino / General Electronics / Re: 3.3v logic to 5v logic on: November 22, 2011, 06:44:49 pm
i did some similar using normal TTL gate and no problem, i used a normal SN7414 with no problem,but i used only 4 of the 6 available , maybe you have to use one with less consumption  like the SN74HTC14 in SO14 package
12  Using Arduino / General Electronics / Re: 3.3v logic to 5v logic on: November 22, 2011, 11:27:17 am
check this    http://www.sparkfun.com/products/8745,but you can use a simple npn transistor with a clam diode in the base
13  Using Arduino / General Electronics / Re: Single PWM Trigger for Common Anode, and Common Cathode LED Strips on: August 23, 2011, 03:21:46 pm
for help you send the full diagram for only one channel with the diodes
14  Using Arduino / General Electronics / Re: Hi guys, question about driving something by mP on: August 23, 2011, 02:55:00 pm
You have to use something like this where R2 is the circuit you want to switch on and off but
1- Transistor must be powerful enough  to drive your circuit, you have to know the amount of current you need
2-The base current must be limited to 20ma so the transistor must have enough hfe ( current gain) for do that
3-For full help i need to know how much current you need and the input voltage
15  Using Arduino / General Electronics / Re: Looking for options: Small, bare AC/DV 12V 1.5A PSU on: August 01, 2011, 02:24:44 pm
 see here      www.jameco.com/ mybe one fit for you
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