why not slowly increase/decrease the frequency until you see the desired results on camera with a potentiometer?

So how come there's a fuse to make it read protected? are you sure it can't be overwritten to make it extractable again?.

Solution would be writing to the eeprom with a couple of values and your program simply halts if they are not precise and there at the right
location or pattern, maybe you could shift the bits somehow making it complicated enough to break it without specialized tools...

That however crude is a more secure method it has to be....

the battery 12v does ok as a filter for the alternator, a couple of caps an inductor coil, a linear regulator...

i've had all my circuits run fine from a car without much issue (but they were not sensitive to emi unlike logic ic's) ....

just use the audio jack out and use the usb for power 5v, all you need then is a 5v amplifier

I figure I'm setup now with most all the test equipment I need at home. I started with this scope but as good as it is the display is a bit to small so I bought a DS203 and the screen is a lot more readable. I also found a logic analyser to be very helpful so purchased a ScanaLogic2 and it has been more useful than the scope.

A logic thingy sounds like a good tool to have

I don't know any "expert" who would diss gaining a whole new perspective on their hobby, certainly not at the incredibly low cost this sort of device is available at.

https://www.youtube.com/watch?v=Xh9FNRpta9s

EEVblog #86 - Buy a real Analog Oscilloscope PLEASE!

I was going from his opinon and i'd consider him an "expert" but for my needs i don't see how what he says hold's true.

while i read the rest of your and the others posts.....

1. I know it's not as good as the real deal.
2. it's hell of a lot cheaper than the real deal.
3. for my needs, all of my circuits are fine, I don't need to read anything beyond a few hundred khz.
4. i've never has an oscilloscope and to get my feet wet, $65 was worth it.

Knowing all that

https://www.youtube.com/watch?v=hLSzo9F4qbo&feature=youtube_gdata_player

That's connected up to an Arduino with the example code.

Code:

/*
 Fade
 
 This example shows how to fade an LED on pin 9
 using the analogWrite() function.
 
 This example code is in the public domain.
 */

int led = 9;           // the pin that the LED is attached to
int brightness = 0;    // how bright the LED is
int fadeAmount = 5;    // how many points to fade the LED by

// the setup routine runs once when you press reset:
void setup()  {
  // declare pin 9 to be an output:
  pinMode(led, OUTPUT);
}

// the loop routine runs over and over again forever:
void loop()  {
  // set the brightness of pin 9:
  analogWrite(led, brightness);   

  // change the brightness for next time through the loop:
  brightness = brightness + fadeAmount;

  // reverse the direction of the fading at the ends of the fade:
  if (brightness == 0 || brightness == 255) {
    fadeAmount = -fadeAmount ;
  }     
  // wait for 30 milliseconds to see the dimming effect   
  delay(30);                           
}

First of all, it might be "tacky" but I just learnt how PWM works, i connected it up to TR/RV lines and watched the data being sent, i've only had it a day and
i've learnt so much!  that alone is value to me, i've learnt and will continue to learn new things with this tool, i'm not interested in reading scientific measurements.

I'm having so much fun with one, I want to get my hands on a full sized 2 channel scope, but i'd probably not even contemplated doing such a thing if not
for the fact i took a risk free try with one of these ARM FPGA devices for $65!

I'm not starting a flame war, I just don't see why the "experts" are so harsh on these devices, would you deny yourself a multimeter because it can only measure voltage?
even if all you need is to measure voltage?

i'm refering to the yellow wires at the bottom, it's oddly shaped cap!

um no.

you have to measure each sensor independently, you'd need a lot of analog inputs, the only thing i can think of using is a multiplexing ic, you feed the data in, then command the chip to switch on any of the channels from your sensors feed it into the arduino all into 1 input

i think an op-amp would suit this question..

the opamp has 2 inputs , when the voltage is cut the opamp could be figured to spit out a high (or low) voltage...

You add a resistor from the analogue input to +5V, and an other from the input to ground, make them 10K. Then AC couple your signal in, that is connect your signal with a capacitor. Like the front end of the diagram here:-
http://interface.khm.de/index.php/labor/experimente/arduino-realtime-audio-processing/

take a look at the setup in the picture, is it me or is the capacitor he's using is infact an inductor/choke not a cap at all!

I have blown up 78L05 regs before by not using input capacitors

Really? how?

so much fuss over somethin so trivial!

use the npn transistor and switch the 5v supply switch on and off when desired.

npn 2222 will handle it

anyone with little or no electronic knowledge is impressed by those who do/can....

you'd have equally impressed her making an LED turn on....

I made them all up myself..... lol