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$250-750 USD

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已发布将近 9 年前

$250-750 USD

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I need to build small circuit board that will have 10 output channels for wire connections. Each wire connected to that channel will be feeding small appliance consuming from 70V to 120V and needing 1Amp load. Once powered circuit board has to energize all 10 channels one by one in a sequence, from 1 to 10th channel. between each channel has to be time delay before it switch to next channel. Time delay could be set by user from controls, and such delay might be in 1/4sec, 1/5sec, 3/4sec, 1sec or 1.5sec increment. If user choose 1/2 second delay, once power applied to circuit board it powers first channel, then after 1/2sec delay powers second channel, then after 1/2 sec powers third channel and so forth till tenth channel. Although user can set first five channels with one time setting, for example 1/4sec delay, and remaining 6-10 channels with 3/4sec delay. This way first five channels will be powered within 1 second ( 1~1/4sec~2~1/4sec~3~1/4sec~4~1/4sec~5~ ), remaining five will be powered within 7.5sec ( ~3/4sec~6~3/4sec~7~3/4sec~8~3/4sec~9~3/4sec~10. ) When power cut off to circuit board (70-120V) all channels turn off automatically together. There should be two controlling knobs or switches or something to choose time delay setting for the first 1-5 and last 6-10 channels. I also need to get two samples to test them in our project. Please give your quote for two samples including shipping and 500 piece order. Thank you!
项目 ID: 7729756

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活跃9 年前

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hi i can work on your project, i had been working on various electronics / electrical engineering project, I will be making a micro-controller based application, and will be using 2 rotatory switch of same numbers of pole, one will be controlling time for first five loads and the other rotary switch will be controlling the time for remaining five loads, there would be a panel mount LED, 1 for power on indication display, and 10 for load indication to show if the load is powered on. the daisy chain configuration would also be maintained in such a way that there would be two port from the box , one output and the other input, if we don't connect any wire , the system would run independent, if the output of one box is connected to the input of the other box , former will perform its function first then the later, we cant connect input to input port or output of box 1 to output of box 2, the connector would be polar connector i will be making acrylic sheet based body with Mild steel screw to maintain tightness, the thickness of sheet can be from 5-8 mm. some of my other local project includes --universal milling machine speed control using PID controller --Line tracking robot customized with robotic arm --Temperature measurement using pic controller kindly be noted that it is quotation for one piece, If you are looking for best solution with no error do inbox me, we can further discuss , i will be very happy to answer you and clarify your ambiguity, Regards AU design
$400 USD 在12天之内
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23 freelancers are bidding on average $641 USD for this job
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Hello! We can discus your project. Please contact me if you are interested. We can make for you 2 prototypes and send via DHL. And we interested making for you small batches 500pcs or more. I will try get you best price. Please contact me in chat, if you are real employer. Best regards, Oleksandr.
$526 USD 在100天之内
4.9 (23条评论)
6.6
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A proposal has not yet been provided
$700 USD 在10天之内
4.8 (29条评论)
6.3
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I will update proposal asap
$889 USD 在15天之内
5.0 (25条评论)
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I believe I may be able to help you with your project. I would envisage a board with 10 relays to switch the power all controlled from one micro controller. There would be a set of DIP switches to set the appropriate time delays. A small power supply module would also be required to power the microcontroller from the 70V to 120V AC input. I think it may be a challenge to get all 10 channels within the space you require and I will not know the answer to that until I begin work on the PCB layout. The only problem with daisy chaining these devices together will be the current required. For two boards the input current would be up to 20 amps when all 10 loads are on. Therefore what is the maximum number of boards you would want to daisy chain this way? As the current gets larger the PCB tracks will have to get thicker and will take up more board space. Also it will effect the size of the relays used as they will have to be rated with the daisy chain current and not just 1 amp. The deliverables would be as follows:- 1. Circuit diagram as a pdf 2. Items list fully costed using distributers part numbers as an excel spread sheet. 3. Custom PC layout with assembly as pdf for approval. 4. Gerber files for PCB layout 5. Firmware in C fully debugged. 6. Two prototype units assembled and tested I would like to give you a full breakdown of costs and timescales but I am not allowed enough characters. Best Regards Dave Lelievre
$1,977 USD 在40天之内
5.0 (17条评论)
5.7
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A proposal has not yet been provided
$555 USD 在10天之内
4.8 (47条评论)
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I am an Electrical Engineer having specialization in Electronics and Control, working as Lab Engineer at FAST National University Pakistan, at Electrical Department. Now a days i am also doing my MS degree in Electrical Engineering with specialization in Control. I have conducted the labs for followings subjects, and also supervised Projects related to these subjects. 1. Control System Design & Modelling (Matlab & Simulink) 2. Digital Logic Design (Verilog, VHDL) 3. Digital System Design (Verilog, VHDL) 4. Computer organization & Assembly Language (8086 processor, 8051 controller) 5. Electric Machines 6. Circuit Analysis and Design etc. I assure you, if you assign your project to me, you surely gonna work with me in future.
$400 USD 在7天之内
4.8 (63条评论)
5.4
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Hi, As per our discussion via freelancer.com chat system. I have set the milestones as below: We will talk for 500pcs later, this will be lowest as possible. Please reply if any confusion. Thanks, Sam
$611 USD 在20天之内
5.0 (11条评论)
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Hello Sir, I went through your project proposal and it's very interesting and I would like to work on this project. Why you should hire me ? * I have four year experience as a freelancer and I am very efficient. * I have many good feed backs. Please visit this link and see for yourself some of my feedbacks on freelancer.com https://www.freelancer.com/u/Anthony989.html *I work full time as a freelancer and I will work as planned,on time. * I have very attractive milestone payment system that benefits both parties and ensure employer-employee trust. Please contact me if you are interested. I am keenly waiting.
$555 USD 在10天之内
4.2 (12条评论)
4.6
4.6
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Hi, I own a small company which designs circuits for oil companies and security firms. I have 3 plus years experience in designing circuits from scratch. I am sure if you look at my portfolio you will be impressed and please give me a chance to talk to you i am sure you would like to work with me:)
$555 USD 在10天之内
5.0 (2条评论)
3.2
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hello i am intrested in your project, i can make first a simulation of your circuit with proteus. thanks
$300 USD 在8天之内
5.0 (5条评论)
2.9
2.9
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Hi, I am an electronics engineer with 25 years of experience in teaching, design, R&D and service. I am looking forward to work with you. Calin
$500 USD 在20天之内
5.0 (1条评论)
1.8
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I'm an Electrical Engineer in Communications and Electronics. I have experience in microcontrollers programming, including PIC and AVR. I have experience in designing electronic circuits for specific industry tasks. My bid is low because I won't be able to build and send you the prototype to your country since there are problems with couriers here in Venezuela. However, if you change your mind and need someone who only designs the circuit, so anybody there could build it, I would be happy to help you. I hope I can help with this project Best regards
$277 USD 在15天之内
5.0 (1条评论)
0.8
0.8
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hi... i can design your project in Altium Designer v14 or v15.. i ll provide to you schematics, PCB, BOM and gerber files and what you need im interesting your project, pls give me more details.. thanks..
$555 USD 在10天之内
5.0 (1条评论)
0.6
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hi, I have team electrical engineers working with me. I know what you want, ready to work.
$750 USD 在15天之内
0.0 (0条评论)
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I already have experience in design of timers for industrial products
$611 USD 在60天之内
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As a competent and knowledgeable hard-worker, who bagged Bsc in Electrical Engineering. I can assure you of proper handling of your project, and will definitely deliver on-time.
$680 USD 在5天之内
0.0 (0条评论)
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A proposal has not yet been provided
$444 USD 在5天之内
0.0 (0条评论)
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I have great expertise in electronics especially in embedded systems, PCB designing, Circuit designing and wireless communication. I have strong grip on my profession and have done many electronics related projects already like - 3D motion simulator - Automatic Guided Vehicle - Automatic Vehicle Location (AVL) - Persistence of Vision Display Etc. All with GUI’s. I will provide you completely working prototype.' Thanks
$333 USD 在25天之内
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I have 12 years of experience in Power Electronics product design and development. I designed the products like Uninterrupted Power Supply, Electronic Ballast, Battery Charger, Dc Dc Converter, Ac Dc Converter and Dc Ac Converter.
$1,111 USD 在60天之内
0.0 (0条评论)
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