Analog Electronics, 555 timer as VCO and a board

This project was successfully completed by MIKY4227 for $50 USD in a day.

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Project Budget
$30 - $250 USD
Completed In
1 day
Total Bids
Project Description


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.


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