Save this Search
     
Sort by:
  • Posted Date
Hiring Open
Fixed Price: $1,000 - $5,000   |  Posted: 7h, 24m ago  |  Ends: 6d, 16h  |   2 Proposals
We are looking for a talented FPGA programmer to help us implement a low noise (<10nV/(rootHz)) lock-in amplifier for heterodyne detection of sideband signals. Carrier frequencies range from 0.3 to 1.5MHz. The lock-in amplifier must have the ability to generate signals at specified frequencies and demodulate signals at the sum or difference of two frequencies (FM/heterodyne detection). Your job will be to develop a working prototype that does the following: 1) Takes in signals via a high speed, 16bit ADC 2) Generates a sine wave with programmable amplitude (ranging from 0 to 5V) and frequency, f2 = (1 to 1000Hz) 3) Demodulates the signals at two frequencies f1+f2, f1+2f2. f1 is determined from the DAC input. f2 is the frequency generated in step #2. 4) Outputs the RMS amplitude of the two demodulated signals via a low noise, 16bit DAC. We have an ADC and FPGA eval board already chosen, part #'s AD9268 and HSC-ADC-EVALCZ from Analog. You will need to help us choose the DAC and fi...
Category: Electrical       

N****lIR
 [?]
Sign in to view client's details.
| N****lIR
|    United States
Fixed Price: Less than $500   |  Posted: Jun 24, 2015  |  Ends: 6d, 19h  |   19 Proposals
Hi... please see attached document. This is for an ultrasonic sensor firmware design project. Thanks
Category: Electrical       

a****ani
 [?]
Sign in to view client's details.
| a****ani
|    United States
Fixed Price: About $20   |  Posted: Jun 24, 2015  |  Ends: 6d, 17h  |   5 Proposals
I would like you to use a tpa3116d 50w+50w stereo amplifer and give me the results like 1. analysis of power efficiency a. open input + 8 ohm output load b. closed circuit + open output c. analysis of power efficiency 2.connect signal generator to amplifier at 8 ohm load a. use oscilloscope to analyse input signal vs output b. drive at max power 50 watts and provide analysis c. find distortion.
Category: Electrical       

r****m32
 [?]
Sign in to view client's details.
| r****m32
|    United States
Fixed Price: Not Sure   |  Posted: Jun 23, 2015  |  Ends: 5d, 15h  |   7 Proposals
Hi, we want to use an IR sensor for a medical application (temperature between 25-45 C). We're interested only in the temperature change of the target (we're not interested in the absolute temperature itself). We would like to know whether there is any adaptation / optimization we can apply to the camera / readout circuit in order to improve its temperature difference accuracy? (compared to the usual case where the circuit is optimized to output absolute temperature, and then we derive the images, frame by frame, to obtain the change in temperature). I need you to support the solution with a reference and/or a calculation that would show the expected improvement in performance due to the optimization for temperature change (compared to the usual systems that are optimized for measuring absolute temperature). Best regards, Gil
Category: Electrical       

g****123
 [?]
Sign in to view client's details.
| g****123
|    Israel
Fixed Price: $150 - $250   |  Posted: Jun 23, 2015  |  Ends: 5d, 15h  |   11 Proposals
I am developing a tiny Electronic Lock Mechanism. The design and mechanical parts are ready. I want an electical engineer to help me find the necessary components and put them together within the lock's container in the correct arrangement. Target is: To be able to command a simple 90degree rotation so that Latch can release the shackle. Components that are required: - Bluetooth chip that will receive the command, and send signal to: - a rotator/motor, both parts to work will need a: - Battery cell.
Category: Electrical       

G****eS7
 [?]
Sign in to view client's details.
| G****eS7
|    United Kingdom
Fixed Price: Less than $500   |  Posted: Jun 21, 2015  |  Ends: 3d, 16h  |   10 Proposals
I need you to design the schematics/programming of a microcontroller based magnetic card reader. The device must store to an onboard flash chip and be interfaced by USB. It must be ultra low power and not have a standby mode. Further information available
Category: Electrical       

c****593
 [?]
Sign in to view client's details.
| c****593
|    Australia
Fixed Price: Not Sure   |  Posted: Jun 20, 2015  |  Ends: 2d, 4h  |   0 Proposals
I am looking for a freelancer who can do a simple measurement of the Total Harmonic Distortion for a Schneider Conext SW 4024 Inverter. This may be done on the 120V or the 230V version. Measurement needs to be made with a nonlinear load, more details will be provided to selected freelancer. You need to have a distortion analyzer as well as an oscilloscope available to bid on this job, and of course have access to this inverter too - at a friend's or colleague's place for example.
Category: Electrical       

D****Ram
 [?]
Sign in to view client's details.
| D****Ram
|    India
Fixed Price: Less than $500   |  Posted: Jun 19, 2015  |  Ends: 1d, 22h  |   4 Proposals
My intent is to mimic this transmitter but improve on it a bit   [obscured]  /2009/06/command-transmitter-by-dave-martin.html?m=1 It would be nice to have band modules by that i mean in the schematic above the band is changed by L6 - L7 and C13-16 this would be nice to be able to just changer out a module for the and i want and then the crystal to get me on frequency the idea is in a emergency situation i want to be able to broadcast a audio file from a device into the transmitter via the shortwave band(s) this transmitter must have a low pass filter so any out of transmitted band harmonics are filtered out this filter must be modular and be swapable inline with the tx so when i change frequency i can change filters as well Transmitter must be capable of producing a minimum 25w output Transmitter must be build on a pcb (no bread board no dead bug no perfboard) This project includes you building a physical working prototype This project includes you designing the ...
Category: Electrical       

w****eed
 [?]
Sign in to view client's details.
| w****eed
|    Canada
Fixed Price: $1,000 - $5,000   |  Posted: Jun 19, 2015  |  Ends: 1d, 17h  |   11 Proposals
I need someone to create for me a phone case with an eink display similar to   [obscured]  / but with some notable differences.   [obscured]  /watch?v=wimGaHI957M. Person must have experience not only in product design but in electrical engineering; experience with manufacturing is a plus. Please give me a realistic timeline on the work and an idea for how you will deliver the final goods. NDA must be signed to work.
Category: Electrical       

h****eye
 [?]
Sign in to view client's details.
| h****eye
|    Canada
Fixed Price: Not Sure   |  Posted: Jun 19, 2015  |  Ends: 1d, 13h  |   9 Proposals
we are looking for a bluetooth smartwatch/bracelet with microphone/speaker. It should look like e.g.   [obscured]  /product-detail/bluetooth-watch-bracelet-watch-wifi-bracelet_60165271648.html The smartwatch must have a button. Pressing that button must run an app on the smartphone and start streaming/recording audio to that app. All other functionality is unneccessary. We are looking for an offer of such a product. It can be an existing one. Also a prototype for a new product would be interesting (but including an offer for cost/item).
Category: Electrical       

s****tar
 [?]
Sign in to view client's details.
| s****tar
|    Germany
Fixed Price: Less than $500   |  Posted: Jun 19, 2015  |  Ends: 1d, 7h  |   34 Proposals
We have a PCB file in gerber format, which has to be transfered into Altium. When this has been done, we are looking for someone that can make changes to this altium design (next job). The PCB has a STM processor, charging unit, MPR121 touch sensor, bluetooth, touch panel and some additional components. The board is part of a devices that sends and receives touch data over bluetooth and translates into motor control.
Category: Electrical       
Skills: Altium Designer, Electronics, gerber       

K****dam
 [?]
Sign in to view client's details.
| K****dam
Fixed Price: Not Sure   |  Posted: Jun 18, 2015  |  Ends: 12h, 34m  |   5 Proposals
Maximum Power Point Tracking in Doubly Fed Induction Generator using Tip Speed Ratio Control algorithm The idea of this project is to make a simulation and evaluation for one of the MPPT algorithms during wind conversion process, which is Tip Speed Ratio Control algorithm. the type of the generator is vector control and the type of the converter is back to back (AC-AC). the parameters of both generator and wind turbine are given in the attached files in "Parameter. Pdf" the simulation must be performed in MATLAB simulator (code or Simulink ) A report that discusses the mathematics equation of the model and discussion for the obtained results are also required.
Category: Electrical       
Skills: Electrical Engineering, Simulink       

m****lab
 [?]
Sign in to view client's details.
| m****lab
|    Jordan
Fixed Price: Less than $500   |  Posted: Jun 18, 2015  |  Ends: 6h, 38m  |   5 Proposals
Hello Electrical engineer required who experts in AC-DC converter. charger power supplies, winder turbines, generators, transformers ready to hire today.
Category: Electrical       

E****ido
 [?]
Sign in to view client's details.
| E****ido *
|    Pakistan
Fixed Price: Less than $500   |  Posted: Jun 10, 2015  |  Ends: 4d, 18h  |   5 Proposals
design a switched capacitor integrator( i have transfer functions for sc integrator) need to implement sc circuits using state space representation method implement it in matlab and cadence
Category: Electrical       

s****k17
 [?]
Sign in to view client's details.
| s****k17 *
|    Canada
Fixed Price: Less than $500   |  Posted: Jun 08, 2015  |  Ends: 3d, 20h  |   16 Proposals
We need a printed circuit designed for a very compact phone charger. It needs to be as small as possible, and particularly as "flat" as possible. while still being designed to UL guidelines. The project consists of three separate PCB's . One for the high voltage circuit. One for the low voltage circuit and some of the watch components. Lastly, one for the watch LED matrix, battery, and any remaining watch circuitry. Dimensions for the board shapes and mounting information will be provided on award. 1. Prefer knowledgeable in eagle PCB 2. Must be knowledgeable in clearance and creepage for power supply/charger (this is very important) 4. Orientation of C1 in the charging circuit must be lying down (freelancer needs to re-draw its foot print) 5. Please review the existing component sizes versus the part list for checking purposes. 6. Final deliverables shall include standard gerber files 7. High and low voltage circuits require a minimum 5mm separation. This will need to ...
Category: Electrical       
Skills: PCB Design       

d****ion
 [?]
Sign in to view client's details.
| d****ion
|    United States
Fixed Price: Less than $500   |  Posted: Jun 03, 2015  |  Ends: 10h, 20m  |   7 Proposals
Hello, i need to filter a mix signal with a digital filter and display the filtered signal on a glcd or tft. The signal contains 50Hz base signal and its harmonics. Plus a fault signal just below 50Hz so all frequency included 50Hz must be gone but a fault signal. Output signal will be written through adc and displayed. I do have a arduino due board which has ADC and DAC moduls on board. Can you design and port it for arduino due?
Category: Electrical       

o****779
 [?]
Sign in to view client's details.
| o****779
|    Turkey
Symbol Key
Payment method not yet verified
Payment verified
Purchased $1-$500
Purchased $500-$5,000
Purchased more than $5,000
You have already submitted a
proposal to this job