Wednesday, January 26, 2011

CrazyEngineers Forum - Electrical & Electronics Engineering

CrazyEngineers Forum - Electrical & Electronics Engineering

Speed voltage in Single Phase Induction Machine

Posted: 25 Jan 2011 06:59 PM PST

Could anybody explain me what is speed voltage?
somebody told this term while explaining the single phase induction machine.
IT was told that it comes due to rotor coupling and affect the dynamics of machine.
I donot know nothing more than this.
Please somebody elaborate it

Ultraflow Transmit Time Portable Flow-Meter With Transducer

Posted: 25 Jan 2011 12:40 PM PST

A flow meter is a meter that essentially measures the rate of flow of liquid flowing through the pipe. Tracking the flow is of utmost importance in industrial as well as domestic sector to avoid accidents and loss of the resources. At the same time, the device must be easy to use and portable. This [...]

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Everything you need to know about Smart Grid

Posted: 25 Jan 2011 10:40 AM PST

The smart grid is a totally new and upcoming concept in the field of electrical engineering. A smart grid uses a form of electrical network and digital technology as its backbone. The 4 major parts of the electrical power system are generation, transmission, distribution and consumption. The digital technology helps in maintaining synchronization amongst these [...]

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communication via bluetooth

Posted: 25 Jan 2011 10:03 AM PST

i am planning a project which uses communication between 2 devices using bluetooth technology , one device in a car and other in installed in a stationary object outside car within 10 meters range. Please tell which devices are there in market?

another power amplifier- lm675 questions

Posted: 25 Jan 2011 03:13 AM PST

Hi!

I'm constructing the "Non-inverting amplifier" in page 1 of http://www.national.com/ds/LM/LM675.pdf. In my circuit I replace the 20k ohm resistor with a 1k ohm resistor since I actually need a voltage gain of 2.
1. If the motor is set to turn forward, the voltage gain is correct, but if I set the motor to turn backward/ reverse, I do not get the correct voltage gain. What is my mistake? From my observation, if I increase the current from my power supply (I use +-8V), it will also affect the voltage gain. What is the correct current that I should set at my power supply unit?
2. I have two motors whose power needed to be amplified. I am using 2 units of LM675. I have only one set of power supply unit, so I just connect the first LM675's pin5 to the second LM675's pin5 and then to the VCC. Then I also connect the first LM675's pin3 to the second LM675's pin3 and then to the VCC. Is this right? I do not get the correct voltage gain with this connection. What is the correct way of connecting the amplifiers, since I only have one set of power supply unit?
3. What is the effect of 0.1mircroF capacitors at VCC and VEE? Is it ok not to use any capacitors at all at VCC and VEE?

Thanks.
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