Analog Discovery

AnalogDiscovery

A neat little storage box with device and USB cable. I plugged it into my PC - the software recognized the device immediately, and the device signal generator sent the commanded tones to my now plugged-in ear phones - GREAT, no muss, no fuss :-)) Loopback is accomplished with supplied male-male connectors, and using the instructions in here was able to view the signal generator output with the oscilloscope :-)) - GREAT, no muss, no fuss :-))

Analog Parts Kit

Looks nice and neat, such tiny components, a number of DIP packages, but the rest is very much smaller since the 1970s, see below. I feel very out of date.

Mini "Grabber" test clips

How to connect probes to them to the AnalogDiscovery is on the web site link above -

The very good instructor assumes that you have the "Analog Parts Kit", or an extensive electronics warehouse. I feel very lucky to have purchased the "Analog Parts Kit" with the order.

The first project in the training is to wire up (on the little plugboard) a blinking LED in series with a resistor - (really needed or you smoke the LED, which is extremely voltage sensitive.)

I quickly learned that there is over-current detection in the AnalogDiscovery which shuts down all outputs and gives a warning box on the monitor. Gads - my bad wiring, try again. Gads, now what ?? After some fumbling about I find that I have set a +5 volt offset into the Signal Generator, and that 5 volts plus the AC output I set caused this over-current situation - removed the +5 volt offset, and every thing worked as suggested in the video.

There are five YouTube videos for AnalogDiscovery:

1. Getting Started - Quickstart #1 - https://www.youtube.com/watch?v=aYgFKIsrOYQ
2. Voltage Tool - Quickstart #2 - https://www.youtube.com/watch?v=Gdl7hPFaPWI
3. Voltmeter - Quickstart #3 - https://www.youtube.com/watch?v=Va1lURqbmew
4. Arbitrary Waveform Generator - Quickstart #4 - https://www.youtube.com/watch?v=rXJXphcV1Vk
   The Arbitrary Waveform Generator has many functions, this is a good start -
5. Oscilloscope - Quickstart #5: - https://www.youtube.com/watch?v=pmJzBCv5G2g
   Any flexible oscilloscope, and this is indeed!! is almost a study in itself !!
   - Many new concepts and functions !! - This is just a good working start !!
   - A full treatment with exercises would be several days of serious study

Please note: after an initial introduction to complex equipment such as the signal generator and the 'scope above - most folks go into a period of trying out different options which might be useful in different circumstances - Not advertized nor discussed in the videos, but interesting to me were:

1. X vs Y plotting for signal phase relationships
2. FFT ( Fast Fourier Transform) computing and display

Here is the little LED and resistor circuit built up and used in the above lessons.

And this is the dual trace oscilloscope view of the proceedings. - blue trace - voltage across the LED - orange trace - current through LED

• Very compact and modern
  - does not take up much room :-))
• "Analog Parts Kit" has this array - also available locally. (you may have to click on the image to enlarge it)

• A little sheet of component codes would be nice.
  I didn't remember the 3 digit capacitor codes, 104 is 0.1 ufd, 102 is 0.001 ufd, is useful
• A good magnifying lens is likely necessary for most people

The bad news:

• Very compact and modern
  - you need good eyes and steady hands :-((

  	Connectors		Resistors, I'm used to the size of the two on the left from my junk box. How good are your eyes seeing the color bands on the right resistor? The picture on your monitor is likely 2.5 times actual size.
  	Big hands, tiny components -

• The labels are as small as the components

• The labels on the DIP packages are grey on black

  Enhanced in brightness & contrast - The following comments are from Doug Mercer of Analog Devices responding to my question contrast - "You are very correct in pointing out the low contrast of the laser branding. This is not unique to ADI, most high volume IC manufacturers use laser branding. I've found that oblique lighting tends to enhance the contract of the branding."

• The Surface Mounted chips, on "DIP Adaptors".

  Enhanced in brightness & contrast. This Digilent document gives the name of the chip and a link to Analog Devices documentation The following comments are from Doug Mercer of Analog Devices responding to my question about pin matching - ... "there is a number "1" printed next to the adapter pin 1. They are always in the lower left corner with the "1" right way up. Also the solder pad for that pin is square not round like all the others. This is per the standard DIP package convention. How the IC pins map to the adapter pins is always one-to-one. So when reading the ADI datasheet pin 1 on the IC package is pin 1 on the adapter etc. No need to trace the wires."

How does the energy get from the base to the battery???

Here is an electric toothbrush with its charging base.

Here is the charging base, no contacts, with an inductor as a sensor, connected to the Digilent "Oscilloscope".

Here is the Digilent "Oscilloscope" as seen on my monitor :-)) - We have set up a single scan, the vertical gain and horizontal timing is plain to see. - We have also set up a horizontal measurement, lower right, selecting "Frequency" - Note the frequency 92.657 kHz, and the method -

How is that for cute and handy ;-))
The base continuously oscillates at about 100 kHz, and when the toothbrush sits on it, that energy couples into a coil of the toothbrush and charges the battery :-))

So, here we are all connected up with AC source across everything and voltage sensing across the parallel circuit and across the resistor :-))

And the wave forms :-))
Orange is voltage across the resonant circuit, Blue is voltage across the resistor
Note the different phase shifts :-))

	A little off resonance, 40.35 kHz		Just about on resonance, 48.5 kHz
	Buildup of oscillations with start of excitation		Showing XY at about resonance, 48.5 kHz
	FFT w Hamming window w constant excitation		Using triangle wave for excitation, note that there is very little harmonic power across the resonant circuit - the orange line -

The Analog Parts Kit links to the data sheet which says that it required 3.3 volts power - our ANALOG DISCOVERY regular power is +- 5 volts. We have a choice:
- a) use IC8 for 3.3 volts
- b) use the Signal Generator to provide the 3.3 volts
Choosing simplicity, lets use the Signal Generator, and watch its voltage for sag.

Now to the microphone, I printed out the linked Data Sheet for the ADMP504

I turn the carrier over, I can see an alignment dot - OK - an ink mark - no, I don't think so - I bet it is the other end - The pictured configuration works :-))

So, lets wire it up and set it up

The 3.3 volts from the Signal Generator is applied to power the IC-10 Well, the output has a bias of about +0.8 volts and little amplitude - - So I put a small capacitor between the output stage and the oscilloscope - Set gain to 5 mVolts/vertical division, say "AH" into the microphone for the doctor, and look at that :-))

0	1	2	3	4	5	6	7	8	9	.	.	.
Bad	Boys	Rape	Our	Young	Girls	But	Violet	Goes	Willingly	Get	Some	Now.

Resistor Color Code - from http://itll.colorado.edu/images/uploads/resistorchart.jpg