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Hello,
I am calculating residual current from 3 phase sinusoidal ,50 Hz current signal using on chip 12 bit ADC(of micro controller).Three phase currents are accurately measured.But I am getting quite good amount of residual current value( even at 2 Amp current) while 3 phase current are...
Can you plz explain how the ckt works? And why it's oscillating?
i understands that at the power up ,transistor ( here 2N2222A) will not be on .with a Dc i/p of 2.5V at -ve terminal of op-amp , op-amp o/p will force the transistor to switch on such a way that thru' R1(+ve feedback ??) voltage...
Hello,
Below is the current source ckt for thermistor( RL).
I am using the current source(approx 0.1mA) to excite the thermistor(RL). RL = 100 Ohm .When I check (+) terminal of opamp with oscilloscope ,the waveform found oscillating (Saw tooth like waveform, mean value 2.5V DC but pk value...
At present Relay coil is supplied by 12V DC only. This supply is 12 V , 150 Ah Battery and My device will act as generator set Start-Stop, Load transfer controller. The same battery will act as auxiliary supply for my device as well as external relay coil ( which will be used for driving START...
There is a pull-up resistance (of 3.3k to +5V dc.) to the signal connected between ULN ouput and IRFZ44N gate. The data for irfz44:
Id = 50 Amp
Vds = 55 V
Rds(on) = 17.5 mOhm
---------- Post added at 09:57 ---------- Previous post was at 09:46 ----------
It shows resistance of only 7.8...
Hi,
Application : micro controller based AMF relay(Genset Controller)
Please refer the attached file for exact application the way IRFz44N is used.The subjected MOSFET is driving a external relay ( Freewheeling diode might not used across the relay coil) which in turn will be used for driving...
Hi,
I would like to measure speed of generator using magnetic pickup. Range of speed is 300 rpm to 3500 rpm and min AC voltage would be 0.5V.Hence I have to interface magnetic pickup sensor with microcontroller. In this regard I require few i/ps :
a) As the speed changes does the o/p of...
Dear sir,
I would like to know .... If i have to implement modbus RTU protocol then is it mandatory that dataframe should be 11 bits?
If i set Parity : NONE then do i require to set STOP bits : 2 ?? is it mandatory or optional.Because I have seen catalogs of few well known company who have...
Re: ADE7758 with Freescale MC9S08LL16
You can use /IRQ as ext. interrupt to mcu and enable required bits at Interrupt ask Registers and read reset interrupt status register.e.g you can use zero crossing bit.
regards,
Arup
hello,
I am planning to use few +5V devices(which were already used in my older project) in my new project with PIC24 chip.My project is based on PIC24FJ128GA110.I want to drive certain +5V operated devices like MUX - hef4067 , Shift register - 74hc595 etc...Can I use Digital i/os of pic24...
ade7753 how pf
Hi!,
Ok. Now i m controlling CS using I/O line and constant data read thru spi is ok.But the issue now is ...
if i read vrms register i get different value(which differ by 5000/10000 or even more ) for same i/p voltage ....i read it inside a timer interrupt which occurs at...
ade7753 project
Hello!,
Here is an observation i have taken.If CS is gnded and then chip is powered up then data reading get corrupted.Instead if i let the chip gets power up first and within a second if i gnded CS pin thru a resistance data reading is OK.
what could be it's solution now...
aeenergy
hi,
it will be nice to share info regarding this project...
i did exactly that. waveform attached in my previous post was reading constant default data i.e 0x40 from IRQEN (interrupt enable register).
In my previous post W_O CS means CS pin is permanently gnded instead of micro...
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