7- PCB Designs

Here are some of the sample PCB designs:

Sound Intensity Sensor	Interface circuit
Temperature sensor	Light & Smoke
Timing and Control	ADC
Analogue MUX
Equations for Sound Intensity Measurement

Comments & Conclusions:

1. The analogue Mux designed using normal 2N2222 NPN transistors did not practically show any errors.
2. The analogue sensors are not 100% linear.
3. To make this system faster, high speed communication and better interface is required. This requires extensive research and time.
4. It is to be noted that whole project is made from scratch utilizing inexpensive electronic components and tools available in the market.
5. The project is good for university students to do research and develop much better models of DAC, Computer interface & computer communication.
6. The main aim of publishing this project on web is only for reference of the publisher and university students for free and does not violates the copy write of  any party.
7. Everyone is welcome to give friendly suggestions.

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