Recent content by florenceooi

Hi Guys ! Thanks for all the helps and advices ! I've fixed my dual rail power supply! My op amp can works finally. Thank You! ^^)

Thanks for pointing out the mistake. I did not realize bout it. I will correct it :D

Thanks for the advices :) yes. the op amp that I'm using has only 1Mhz gain bandwidth products. This is bad right? If I amplify my signal twice? Is it better? Each amplifier with the gain of 10?

Something like this? So you mean the node between the 2 resistors will be my ground connection right? which means i have to connect all my capacitors to the node between these resistors? Am i right?

Thanks a lot ! I will try to get a step down transformers and rebuild the dual rail power supply. Meanwhile, I'm trying to build a darlington pair to amplify the ac signal. Can Darlington pair amplify small Vac? From my understanding, the darlington transistor amplify current that pass through...

I'm sorry. I posted the wrong image just now. Could you please check the post #7 again, that diagram shows my connection on building the dual-rail power supply. Thanks.

I did connect my circuit to GND and VCC exactly as shown in my schematic diagram.

No. the ground of adaptor has been connected to input of 7915. and the ground pin of 7915 is connected to the input of 7815, which means actually I just try to get the negative value by changing the polarity. Which I just realized that I did a huge mistake. Is this the main cause that my op amp...

Yes. I already connect a 10k resistor at the output. I think I built the wrong +/-15V circuit. This is how my connection. I am using a 24V regulated voltage adaptor to supply the voltage to LM7815 and LM7915. which means now the gnd from 7915 is supply to the input of 7815 and...

Forgot to mention. For the hardware part, the other pin of the 1uF at pin 6 of op amp is connected to multimeter to measure the output. ( it is not floating )

And here is how I coil the Live wire through hall effect sensor current transducer.

Hi ! I want to amplify the output of my hall effect current transducer ( CSLA2CD ). The output of my hall effect sensor is 15.6mVac. And I used a dual rail op - amp to amplify this small ac voltage which the gain is 101 ( as shown in the schematic below ). I tried to simulate using multisim...

Thanks for all the advises,guys! I will try to do again and post my outcomes. Thanks =)

Hi, sorry for not make my statement clearer. The hall effect sensor that I'm using is hall effect switch AH182. I said everything works fine as in testing the hall sensor. I build a simple circuit with LED to test the hall effect sensor. When the magnet ( south pole ) is close to the sensor, the...

Hi Guys, I'm currently doing my final year project which my title is to design a remote sensor to monitor home electrical apparatus by using hall effect sensor. I've build a basic circuit and amplifier to test my hall effect sensor ic ( linear) with a magnet. Everything works fine and now...