1. J

    Op amp output different from calculated?? Any help appreciated!

    Hi all! I am new in op amp, and currently studying the basics of it.. So I designed this LM741 circuit with a single supply, I made the input at the V+ to be 1.5v supplied by a voltage divider, and a gain of 3 with feedback resistor being 20k and R1 being 10k. My problem is, according to the...
  2. sbya1875

    Noise Parameters and thier effect on Filter design

    Hi everyone, I was designing a filter and my team wanted to ensure the total noise to be as low as possible and hence searched for low noise op-amps. I'm actually having a problem with the term Input Voltage Noise Density, like for AD8605, the datasheet mentions Input Voltage...
  3. xenon_eleven

    Active Butterworth Bandpass Filter unexpected peak

    I am currently trying to design a bandpass filter in a simulator for a university assignment to the following criteria: Frequencies below 1KHz and above 250KHz should be attenuated. Note that you will need to calculate the cut off frequencies given the pass band (1KHz to 250KHz) should not be...
  4. B

    Need help AC coupling push pull amplifier with op amp

    I have an AC input of 0-5V that i need to go from -2.5 to 2.5V. this will then go through an op amp and then trough a push pull amplifier configuration. I just cant seem to find a value for the capacitor that will work, so if someone could explain where im going wrong that would be greatly...
  5. Arjuna1

    Adding Voltages

    I am working on detecting fingers being placed on guitar frets. My idea is to run a small voltage through each of the strings, a different voltage for each string. The player touches the string and makes the string touch the fret. On the end of the fret I detect the voltage with a...
  6. R

    DC biased opamp input resistor function

    http://www.generalguitargadgets.com/pdf/ggg_dist_plus_sc.pdf I'm looking to understand this schematic. Currently focussing on the input and power stages. Here's where I'm at: INPUT R1 is a pulldown resistor. It provides a path for the leakage current through C2 when the switch is in the...
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