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  • Forum Post: ISOLATION CIRCUITS???

    William Hernandez
    Hello I am working with an instrumentation amplifier (INA129) for EMG (electromyography), as I read it seems I need an isolation circuit, but it is not? or is it built?, I thank you for your cooperation.
    on Jul 29, 2010

  • Forum Post: Current source with OPA381

    Perhirin Steven
    Hi, I would like to create a courent source which could provide 25 mA as constant output current. I read the datasheet(OPA381) and it says that the current typ is 10 mA. I couldn't find how much is the ouput current max. I already have the schematics of my circuit that include an Amplifier. I...
    on Jan 28, 2011

  • Forum Post: Sense amplifiers?

    Nate Koppenhaver
    Hello I'm designing a 16x5 SRAM and I need some type of sense amplifier for the outputs of the SRAM cells. I would just use a SRAM chip, but this is a specialized purpose so I need to build the circuits myself. Any ideas?
    on Feb 8, 2011

  • Forum Post: Re: Voltage Converter 3v to 10v

    Danish Ahmed
    Well thanks bruce, really it`s working but another issue came up, i want to invert voltages like for 0v to 3v input ,i want to produce 10v to 1v output. Any advice will be helpful . Cheers Bye Bruce
    on Mar 14, 2011

  • Forum Post: Re: Voltage Converter 3v to 10v

    Danish Ahmed
    Thanks Bruce you are a genious thanks for the help.. I was also trying to made a voltage follower for Sharp high Imperdance IR Sensor. this sensor produces 0 to 2.5 volts output, but due to high impedance I cannot use it directly with my scaling circuit. So i want to make a voltage follower. Unfortunately...
    on Mar 24, 2011

  • Forum Post: 0 to 2.5 scaling to 10v to 0v

    Danish Ahmed
    Hi, I am building a sensor to measure the distance, sensor give output from 0 to 2.5 v DC. I want to convert these voltages into 10v to 0 V range. 0v in ---> 10v out 2.5 v in ----> 0 V out So that sensor can easily talk with Inverter ( AC DRIVE ) to control motor speed. I know...
    on Mar 24, 2011

  • Forum Post: TL971DBV in SOT-23. Available?

    David Nizel
    TL971DBV in SOT-23: Does this part really exist? I have a customer who is designing a circuit board with this part. Can't get samples, isn't listed other than on the data sheet. http://focus.ti.com/lit/ds/symlink/tl971.pdf If it does not exist, what is a suggested pin-for-pin replacement...
    on Jan 20, 2011

  • Forum Post: Scale input of (2.6V - 0.40V) to output (10V - 1.8V)

    Danish Ahmed
    Hi Bruce, In response to our earlier conversation, i have started new thread.. Now i am wondering to scale input of (2.6V - 0.40V) to output (10V - 1.8V) , I can only use positive voltage. Any Help will be very appreciated. Thank you Regards Danish
    on Apr 1, 2011

  • Forum Post: OPA 454 Status pin

    David Mittmann
    I couldn't quite find the answer to these questions on the datasheet. 1)OPA 454. Does the Status pin(5) have to be tied to V+ through a resistor if the status flag is not being used? 2) If using Figure 76 "Output voltage boost" Would the status pin still be tied to the individual...
    on Apr 8, 2011

  • Forum Post: Motor Current Sensing

    Rasit GOKALAN
    Hello, In my project I will sense motor current through shunt resistor . But in my project inverter ground and micro ground is isolated. Because of this I want to use instrumentation amplifier INA333 to measure voltage across the current sense resistor. Amplifier ground will be the same with micro...
    on Oct 11, 2011

  • Forum Post: questions about the instrumentation amplifiers

    Keven74263
    Hi, all. I have a few questions about the instrumentation amplifiers: 1. Are all instrumentation amplifiers based on 3-operational amplifier? 2. What does the 'common mode voltage' in the documentations talking about amplifiers mean? Does it refers to the voltage with respect only...
    on Dec 28, 2011

  • Forum Post: LM2902 input impedance

    Mike, Jung
    Hello I wonder the input impedance LM2902. Now, Vin(+)/(-) = 0.45V, Vout = 4.7V, Vcc = 6.8V LED is in front of FET drain. Inverting input is 750 resistor, but non inverting input isn't. I test this circuit inserting the inverting 1K resistor. The result is Vin(+)/(-) = 0.46V...
    on Jan 16, 2012

  • Forum Post: Assistance seeked for Loop powered 4 20 mA circuit

    Aditya Ayachit
    (Please visit the site to view this file) Dear TI Engineers, We are trying to make a loop powered 4-20 mA pressure transducer circuit. There are two flavours which I am working on. One is the circuit with XTR106. The design has been verified tested and on it's way to production. It...
    on Jan 21, 2012

  • Forum Post: step down (10V-3.6V)

    sanjeev kumar87916
    Hi all, I want to convert 10V,4-20mA,50Hz analog signal to 3.6V. IF i am not wrong, we can achieve this in 3-ways. 1) By using voltage divider circuit 2) By using OP-AMP 3)By using voltage compression Diode. Please suggest me which one will be a good Practice and if possible please...
    on Jan 24, 2012

  • Forum Post: 5v to 15v

    sanjeev kumar87916
    Hi all, I want to bust 5V analog signal to 15V and should have 200mA DRIVING CAPABILITY. Please help me BR Sanjeev Kumar
    on Jan 25, 2012

  • Forum Post: Op amp temp sensor

    Hithesh
    I am trying to understand a temp sensor ckt in TI app note AN56. I have attached the app note ckt and my simplified ckt. So the sensor has a constant voltage bias. Vbe will be something around 0.65v at zero C. To make the output of the opamp zero, another reference but with opposite polarity is...
    on Mar 16, 2012

  • Forum Post: Using OpAmp as attenuator

    Naji Naufel
    Is there an OpAmp and circuit diagram that will allow me to attenuate a 0-10V signal to a 0-2.5V output before feeding it into an ADC? Thank you
    on Mar 22, 2012

  • Forum Post: Driving MOSFET with Op Amp

    William Mack
    I am driving a MOSFET with a typical input capacitance of around 2800pF with an LM324 R-R op amp in the linear mode using a standard function generator. Unfortunately, the LM324 cannot drive the MOSFET much beyond 10Khz because the MOSFET gate starts drawing current past 10Khz. I want to drive the MOSFET...
    on Apr 13, 2012

  • Forum Post: LMP2021MAEVAL

    sanjeev kumar87916
    Hi All, Can any one tell the Board Size of " LMP2021MAEVAL " Evaluation Board. Thanks And BR Sanjeev Kumar
    on Apr 17, 2012

  • Forum Post: noise caculate about amplifier!

    lei fu
    Hellow, ENGINEER; I have caculate the following structure noise ,but I dong't know how to caculate the inveresting current noise that flow through the gain resitor ,can the current flow through the feed back network of R1 and R2 or RG? I WANT to know the path of the the current noise?thank you
    on Mar 14, 2012

  • Forum Post: ISO122 Isolation Amplifier Expected Behavior

    Chris Cole
    I'm using two separate power supplies with the ISO122 part, both supplies supplying +5V and GND. I have a varying voltage signal (1V-5V) being derived from the input supply, and I expect to see the same voltage on the output of this chip due to the nature of the part. But instead, I always get a...
    on Jul 5, 2012

  • Forum Post: Application Note (AB-076 NOISE ANALYSIS OF FET TRANSIMPEDANCE AMPLIFIERS) Needs Update

    Yi Zhang99382
    This application note was carried over from Burr-Brown. The math involved in this application note needs to be checked. 1st). Number from equation (9a) is inconsistant with number in equation(15a). 2nd). Figure 8) and Figure 9) needs to be checked 3rd). The procedure to calculate current noise...
    on Mar 8, 2012

  • Forum Post: OPA549 KVC (R-PSFM-T11) Package

    Chris Brandt
    Hello! I am using the OPA549 in a design but have a limited height clearance. I plan to use a custom extrusion for the heat sink that lies flat against the PCB and a fan for cooling. Can the KVC package be laid flat against the PCB after assembly or have its leads be pre-shaped beforehand to facilitate...
    on Oct 17, 2012

  • Forum Post: reprogram

    ben delagana jr.
    Hi, Is there any option to reload the program if I suddenly erase the contents of the eeprom after completing TC. I am using multi-cal system with sboc401a software. Can I null or re-zero the output of the real-world sensor after TC, because sometimes after completing calibration of the unit I verify...
    on Jan 8, 2013

  • Forum Post: Is Part #LF356H controlled under ITAR?

    Kim Pritula
    Part # LF356H, Amplifier; JFET Input Operational; +/- 18 V (Max.); 5 mA (Typ.) @ +25C Supply Is this an ITAR part? If not, is it controlled under the EAR? Thanks. Kim
    on Feb 11, 2013
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