Analog Electronics, 555 timer as VCO and a board

$30-250 USD

已完成

已发布

大约 11 年前

$30-250 USD

货到付款

Hi, We want to make a simple device. It's a sensor connected to a 555 timer acting as a VCO. There is also a simple NPN transistor which is sometimes turned on. The whole device is operated using usb power from a cell phone and the audio input/output of the cellphone. The audio turns the NPN transistor on. The audio records the output of the 555 timer. We also need a board designed. It should take less than a week to complete the project. We will discuss it in more detail if you have a nice bid. -Brian

Electrical Engineering

PCB Layout

项目 ID: 4140388

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15提案

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活跃11 年前

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@MIKY4227

Hi is easy see portfolio for samples

$50 USD 在1天之内

4.9

(46条评论)

6.4

15威客以平均价$103 USD来参与此工作竞价

@MikroStar

hi, i can help.

$200 USD 在5天之内

4.8

(68条评论)

7.6

@pcbdcs

Hello, I can do this.

$90 USD 在7天之内

4.8

(122条评论)

6.7

@Davelelievre

Hi Brian I believe I can help you with your project

$100 USD 在5天之内

4.9

(27条评论)

6.2

@shahbaz1980

Hi, i need to know followings. 1. what frequency VCO will produce? 2. amplitude of output signal of VCO? 3. Duty cycles?

$30 USD 在2天之内

4.5

(50条评论)

6.9

@technofreakz

I have experience in designing PCB with CadSoft Eagle.

$70 USD 在5天之内

5.0

(3条评论)

3.9

@nevorek

Simple task

$50 USD 在0天之内

4.3

(2条评论)

3.8

@beautifulangels

hi i am electronic engineer and expert at analogue electronics i can help you

$100 USD 在7天之内

5.0

(9条评论)

2.9

@ExpressElectro

Hello sir. I have master degree in electronic, and this is pretty basic project. I can fully finish you'r project for several hours. I offer you cheap and reliable design, and i guarantee you for quality of design. Also i will fully support you to the end of project. Feel free to contact me. Bye

$60 USD 在1天之内

4.8

(3条评论)

2.8

@aki542

Hi,I can help u.

$70 USD 在7天之内

3.8

(2条评论)

2.2

@parmarjp

I can help you with this project.

$250 USD 在15天之内

4.5

(3条评论)

1.6

@FlyingPigeon

You will get best results!

$100 USD 在15天之内

0.0

(0条评论)

0.0

@tryitout

This project shouldn't even take a week. I have all the parts laying around, I can put it breadboard and give you a video showing it working and then proceed to a PCB layout using eagle. It's sad how many engineering graduates these days might suffer with such a project!

$130 USD 在6天之内

0.0

(0条评论)

0.0

@uetian2013

It's pretty good project i am also looking for this kind of project. I have very strong grip on power electronics device. i can do that. For further satisfaction check my profile.

$170 USD 在6天之内