Wednesday, October 20, 2010

CrazyEngineers Forum - Electrical & Electronics Engineering

CrazyEngineers Forum - Electrical & Electronics Engineering

Need Help w/ Drop Testing apparatus

Posted: 19 Oct 2010 10:44 AM PDT

Hello everyone. I just joined. I THINK this the correct forum category for this and if not please correct me.

I'm more of a mechanics guy and know a little about electronics. I'm definitely a novice regarding accelerometers and am making an effort to put together a simple indoor, single axis, analog, drop testing apparatus to do some tests on helmets - which I understand have impact event times of about 10-15 milliseconds. The sensor will be mounted to a test head inside the helmet so that should change the event time detail and I don't know what that would be. I think I have the hardware parts identified which will be compatible - and those I'm not completely sure about either. I still need the data acquisition software to give me the readings of the Gs at impact. I don't think they'll be much higher than 200g. The only software I've found is at least several hundred $ and provides much more than I need now.

Does anyone know of any data acquisition software than can serve my needs? I just need it to provide the Gs at impact - really basic. It can be old or used or ugly but I do need it to be reliable. If it's free that would be BIG help too as the whole expense of this is for an R&D experiment.

I'm running Windows XP Pro (SP3). Thanks!

Tata Visiting College For Internship. What subjects/topics shall I study?

Posted: 19 Oct 2010 10:26 AM PDT

Guys,
I am in 3rd year electrical branch. After few days Tata steel is visiting our college for interns.
Can anyone suggest me few topics i should study.


Thanx in advance.

Help me choose some hardware for my project

Posted: 19 Oct 2010 08:42 AM PDT

Hello there,

I want to make some electronics for my car. I am not sure which components I should buy, so I hope you could suggest some solutions :)

Thanks.

I want to be able to send SMS to a receiver in my car using keywords, and I want the controller to open and close relays, gather information from sensors, and in some cases return, say the oil temperature back to me via SMS.

Secondly, I am interested in finding the car's location at any given time. Possibly by GPS.

It is important to me that my system can run for many, many, many years without attention.

I know programming in c. I have never worked with micro controllers before, so this will be fun! :)

Thank you for your time.

Kind regards,
Marius

Voltage regulator Capacitor values ... ?

Posted: 19 Oct 2010 04:40 AM PDT

Hello
i keep on wondering how to determine Capacitor values for input and output of a voltage regulator
for instance , right now i'm using 7809. the datasheet and the engineers around me are giving me different values for the VR input C and output
for instance some say for input
330N ,
0.1u
output
10u
1N
100N
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