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Author Topic: In search of Circuit Design Freaks?  (Read 135 times)

no1uno

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In search of Circuit Design Freaks?
« on: September 11, 2010, 04:41:31 AM »
Righto - I am looking at NMR - the availability and price of the permanent magnets that may in fact make this possible makes me look at the electronic side of things and that ain't so simple.

I do know that a USB 2.0 Breakout with/without a programmable microcontroller is fairly inexpensive, programmable oscillators are also cheap, as are the op-amps, etc. Even the analog->digital (ADC) and digital-analog converters (DAC) are cheap enough (provided they can be run from the programmable components), there are even breakout boards for a tuneable transmitter (87.5MHz-108MHz) & receiver (76-108MHz) pair (both ends of the coil).

There are several papers in the references thread detailing what is necessary - but the ability to program the oscillator, the FM transceiver, the digital->analog and analog-> digital takes care of a lot of what is under the hood. The logical processing & the signal decoding should be able to be adequately dealt with programatically. The size of these component boards are incredibly small, the voltage appears to be within that available through the USB 2.0 port, which can also deal with the outgoing & incoming signal(s).
« Last Edit: September 11, 2010, 05:06:55 AM by no1uno »
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overunity33

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Re: In search of Circuit Design Freaks?
« Reply #1 on: September 11, 2010, 03:43:22 PM »
One of those papers you requested mentioned FPGAS for a single board NMR, go put up a flier in your local college's electrical engineering dept. "will trade food for fpga programming"

heisenberg

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Re: In search of Circuit Design Freaks?
« Reply #2 on: September 11, 2010, 07:29:44 PM »
Are you trying to build an NMR from scratch?...

You should check out arduino if you want to learn about programming embedded systems or microcontrollers. It uss a c++ like language, which is very easy to use and learn.
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no1uno

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Re: In search of Circuit Design Freaks?
« Reply #3 on: October 30, 2010, 05:18:40 AM »
Actually I'm considering setting up a small Raman Spectrometer from scratch first, well, Raman & VIS-NIR...

Then the NMR. All using the same GUI, all hooking up behind the scenes to the FREE online DB's... Also programmed with the shifts for various functional groups (in wavenumbers/nm and ppm/Hz, so that the software can say hey, lookee here).

What would be the best Laser to start with? I have green (532nm in 30mW), but I think, providing I"m using the camera with the IR filter off, the 150-200mW 650nm should give a big enough signal, while it would also give much better resolution provided I can pick it up.

I've long dreamed about being able to own one, it seems that shifting some of the same thing I make is a prerequisite to being able to afford ownership. Then again there are plenty of people who'd like to own one, they just aren't silly enough to make it.

If I can get hold of some funds I'd love to be able to throw them up on ebay/etc. for $500 each and see how long they last:P
"...     "A little learning is a dang'rous thing;
    Drink deep, or taste not the Pierian spring:
    There shallow draughts intoxicate the brain,
    And drinking largely sobers us again.
..."

embezzler

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Re: In search of Circuit Design Freaks?
« Reply #4 on: November 13, 2010, 11:35:27 PM »
Hi No1uno,

Just curious as to how this is or isn't coming along I am interested in UV Vis and mostly IR. Specifically what do you need in terms of circuit design and I will see if I have someone that may be able to help ;)

Are you intending to reverse engineer some older model and get the parts online or to totally start from scratch? This may cut out some of the considerable R and D time that you are going to have to put in. If you can dig the serial number off a model the company will probably send you the drawings and will help with trouble shooting if you are cheeky.


If it works for 500 bucks on ebay you have yourself a deal :)


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Wizard X

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Re: In search of Circuit Design Freaks?
« Reply #5 on: November 14, 2010, 12:53:01 AM »
Quote from: no1uno on September 11, 2010, 04:41:31 AM
Righto - I am looking at NMR - the availability and price of the permanent magnets that may in fact make this possible makes me look at the electronic side of things and that ain't so simple.

There are several papers in the references thread detailing what is necessary - but the ability to program the oscillator, the FM transceiver, the digital->analog and analog-> digital takes care of a lot of what is under the hood. The logical processing & the signal decoding should be able to be adequately dealt with programatically. The size of these component boards are incredibly small, the voltage appears to be within that available through the USB 2.0 port, which can also deal with the outgoing & incoming signal(s).

What are you wanting to make a NMR? Just a project or drug identification?
Albert Einstein - "Great ideas often receive violent opposition from mediocre minds."
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