1. S

    Analog sensor non-linear region

    I'm working with a distance sensor that gives erratic readings when an object is <2". Here's a plot of MCU ADC counts (orange) and voltage input to ADC (blue). My first thought is to monitor the dv/dt after we cross the 2" threshold and ignore anything that doesn't have a linear increasing...
  2. C

    Ultrasonic sensing

    Hi all, I am working on an ultrasonic sensor for occupancy sensing. This device would drive an LED based on movement, and I was wondering if detection could be achieved the following way Where the sensors and the moving person lie in opposite sides of the wall, and the ultrasonic waves would...
  3. E

    Analog multimeter needle "offset"

    Hi everyone. I have a several decades old analog multimeter, which works fine except that the needle stops at slightly different position if the movement goes up, than if it goes down. As an example. If I probe 10 volts DC (12 V scale), the meter stops at aprox 9 V. If I change to 3 V scale...
  4. P

    Reading the Analog Value using the ADC pins

    Hi, I am using a Texas Instruments Microcontroller (TMS320F28335), I would like to read the analog value from circuit output to be read by the microcontroller using the ADC pins. Please help me in how to do this. Thank you.
  5. S

    8th order sallen-key butterworth lowpass filter

    Hi guys, I'm running into some problems designing a 10MHz 8th order sallen-key butterworth lowpass filter. My requirements are: cornerfrequency f_c = 10 MHz max passband gain of 0.5dB filterorder of 8 available components: resistors, capacitors, op-amps What I have tried so far: I found...
  6. T

    Analog CMOS IC layout: DRC, DFM, DFR

    Regarding CMOS analog IC layout, what are differences between DRC, DFM and DFR? What I understood during research: - DRC (Design Rule Check) checks if a laid out block follows technology rules what ensures dimensional precision and electrical parameters - DFM (Design For Manufacturing)...
  7. N

    Multiplexing channels in Labview

    Hi there! I am working on something similar and would appreciate if you could drop the vi. Much appreciated! Moderator Edit: Thread split off from this: https://forum.allaboutcircuits.com/threads/about-function-generator-and-multiplexer.138826/
  8. O

    TE- BNC Connector - Pin Description for PCB

    Hi, I am using TE Connectivity Right Angle 50Ω PCB Mount Fitting BNC Connector for signal output in a PCB Board. It contains 2 Pins. Is Pin 1 for Signal and Pin 2 for ground? Also, do I need to add any protectors(EMC, Etc...) inboard for this. Thanks in advance
  9. B

    Ability of PLC's to communicate via 4-20mA and 0-10volts between laboratory devices and the PLC

    Hey guys, I'm studying electrical engineering technology and the Coronavirus turned my capstone project into a research paper. My assignment is on PLC's, which we have covered the basics of, but I still know little about how they operate. Here is the prompt: "Research the ability of PLC's to...
  10. Emad2017

    How Can I submit a novel patentable design idea to a company?

    Hi there, Recently, I have designed a new charge amplifier than can be used to implement a precision and low-cost interface for piezoelectric sensors. I have published an article about the novel proposed circuit in IEEE Sensors Journal. ( A brief information about the new proposed circuit has...
  11. Crazy_BJT

    Troubleshooting/repair Hameg 1500 scope

    Hi there to you all, I need some help with a troubleshooting/ repair. I have an analog/digital oscilloscope Hameg HM1500, it has some RTC problem, it presents a partial sweep. I think is the horizontal circuit, that's either missing a voltage or there is some faulty component. The only problem...
  12. C

    Triangular signal cutting off

    I made a circuit to demonstrate the work of a 555 and a constant current regulator and wanted to add triangle wave input. I've done that by integrating the output of a 555 timer, and at the node 'tri' I do get the desired triangle wave of ~ +-8V. Since I want the the voltage positive at all...
  13. T

    how to determine the small signal parameters(gm, ro) of nMOSFET from Datasheet?

    as I want to calculate the transfer function of circuit that is meant to generate source current using an Op amp as control loop, I need the gm and r0 of the mosfet(to determine the transfer function of the Op amp current source with nMOSFET) here is the picture of MOSFET with showed parameters...
  14. E

    purpose of using two opamp together

    Hi i am referring one opamp based design (designed by friend of mine)where two op amps are used. one in inverting configuration and other one is in non-inverting configuration. i am bit confused what would be the purpose of using two op amps together? here is attached schematic. (Here R4 is...
  15. O

    Load cell Data(Force sensor) to 2 systems

    Hi Everyone, Curently i have a Tension Compression Load cells(attached datasheet) connected to a Electronic control system which Supply's voltage and calculate the force. Right now i need to send the raw data of the load cell to another complete diferent application. Is there any interface...
  16. D

    5V PWM to 12V analog for lighting control. Arduino

    Hey, so I've got to build the circuit to output the signal specified below I've currently got an Arduino UNO and I have written the code to output this. however, I can only put out 5v from my Arduino and the circuit requires 12V and 10V output, being able to switch between12 and 0v incredibly...
  17. C

    How to display various parameters (voltage, current and temperature) on 7-segment display every 5 seconds

    I have built an op-amp series pass voltage regulator, whose output is inputted into an analog-to-digital converter (ADC0804). The ADC's output is connected to a CoolRunner II CPLD Starter Board. This output corresponds to a value on a look-up table, which determines what value would be displayed...
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