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Recent content by masab_ahmad

  1. M

    ECG sensor circuit noise problem

    So which op amp would you prefer? it should be in a dual package, and with a cost similar to the LM2904
  2. M

    ECG sensor circuit noise problem

    Thanks for the reply I'm quite experienced in analog design :P Those ICs were used to reduce the overall cost of the system. The problem was solved though. It seems the wire connecting the electrodes to the circuit was picking too much noise (50Hz), so i used a standard oscilloscope probe for...
  3. M

    ECG sensor circuit noise problem

    Hi! I am making an ECG circuit from this link below, and i've replaced the AD620 with an AD622 instrumentation amplifier. I've also replaced the OP97 op amp with an LM2904. The problem is that i'm not getting any signal from the electrodes and from the output of this circuit (i should have got...
  4. M

    Negative Voltage generation using regulators

    I actually wanted to give + and - 5V to an op amp, and wanted to use 2 small cell phone batteries in series and later regulate the output to the op amps, so the circuit i posted above is not possible?
  5. M

    Negative Voltage generation using regulators

    Hi, i'm trying to get both positive and negative voltages to run an op amp. will this circuit work? it uses 2 regulators...
  6. M

    Regarding Piezo Freq Response

    Hi, I just wanted to ask that can a common guitar piezo detect frequencies of >100Khz?, which can be filtered out and amplified for further analysis? Thanks! Masab
  7. M

    For loop Problem in Verilog

    I think the second option you have specified is better for a reduced hardware, many thanks for the help!
  8. M

    For loop Problem in Verilog

    is there a way by which i may get the values at the other indices, maybe without the for loop?
  9. M

    For loop Problem in Verilog

    Hi all, I am having trouble with this code. Xa, Bi, Y, Bj, Z and W are I/Os of another module which multiplies and adds Xa-Z to give the output W, which works fine alone. The loop variable seems to be working fine too as correct values are assigned to the variable new1[i]. The problem arises...
  10. M

    Looking for a near IR LED and photodiode with an about 1600nm wavelength

    Hi all, I am looking for a cheap, single color, near IR LED/Laser Diode and a receiver photodiode for it, with a center wavelength of about 1550 - 1600 nm to monitor blood glucose absorptions...like this one: LED1450E https://www.thorlabs.com/thorProduct.cfm?partNumber=LED1550E or this one...
  11. M

    Need startup help on Xilinx System Generator

    Hi all, I want to start some work on the xilinx system generator in simulink, any ideas or tutorials/sample projects on where should i start?, also when i made an inverter in simulink using the system generator, it compiled in matlab just fine, but when i try to simulate it in Xilinx ISE, it...
  12. M

    QPSK noise addition help simulink

    Hi all, I made a QPSK mod/demod in simulink which AWGN channel. The output is fine when it comes to seeing random bits. I also dont want to use inbuilt QPSK/AWGN blocks. But the noisy scatter plot doesnt come out to be ok. Can anyone help me on this? Also, please guide me on making a BER/SNR...
  13. M

    mikroc/proteus problem

    files attached, i also simulated the attached stuff on another simulator, The RealPic Simulator, and it all works perfectly on it....
  14. M

    mikroc/proteus problem

    Hi all, I made a few codes on MikroC and used proteus to see the simulation. I am using a pic16f877a microcontroller. I firstly made this simple code, which didnt work in proteus: void main() { TRISC = 0 ; // PORTC as outputs PORTC = 0 ; PWM1_Init(40000)...
  15. M

    pic16f877a pwm problem

    Hi all, i made a code to drive 2 DC motors. the PWM pins are connected to a 1k Resistor, which is connected to the gate of a irf510 mosfet with the motor connectd to it(is this ok?). ive attached the code here, it should vary the PWM with variations in the ADC value stored in the 'temp'...
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