1. grandslam67

    How do I design a Multistage Amplifier with given specifications, specifically the upper 3dB cutoff frequency?

    I have been tasked to design a multistage amplifier with the following specifications: Gain(V/V) = 30, Rin = 20 kohms, Rout < 25 ohms, Power supply = Dual +12V -12V, Max Symmetrical Swing > 9Vpp (peak-to-peak), lower 3dB down point < 200 Hz, Upper 3dB down point > 5 kHz, Rload = 200 ohms. I...
  2. U

    Celestion A6S Search for a diagram or service manual

    The subwoofer formally works, but when the level increases, an unpleasant, inadequate sound appears. These are definitely not speakers, I checked them on another device. No body vibration. The oscilloscope shows that the final stage does not have enough power. This subwoofer uses a tracking...
  3. I

    What should be the order of high-pass and low-pass filters in an audio amplifier circuit?

    Hey guys I am a real noob at circuit designing. Here is an amplifier circuit I put together for a center channel subwoofer of a 2.1-channel USB-powered speaker system that I am planning to build. I basically made this circuit by binge-watching YouTube videos and following the IC's datasheet. Now...
  4. kapcina

    Amplifier with 500 voltage gain

    I want you make a amplifier with 500 voltage gain and use a amplifier with common emitter, but I can't get a gain over the 100 with any value of resistors. Vdd is 12 V and b is 100
  5. Luiz Fernando Vieira

    transconductance photodiode?

    I'm having trouble finding a theoretical explanation about the transconductance photodiode behavior, the materials I find on the internet they talk about the connections, but not the behavior, in case someone could insert material or write here with the source please.
  6. M

    AD8226 Instrumentation Amp Not Outputting Correct Voltage

    I've been working on this for the past few hours and I'm at my wits end. Basically, I'm trying to amplify an input voltage with a 100-ish gain using an AD8226 on a breadboard. I'm using a +/- 5V supply to power and op amp and using a 10 mV test for the input. I'm also using an oscilloscope to...
  7. Minchuu

    CMOS low noise amplifier reference suggestions

    Hello, I want to design a CMOS Low Noise Amplifier for the frequency range 0.65 MHz to 1.45 MHz with: less than 3dB NF, ~10 dB power gain, greater than -5 dBm IIP3, and input and output impedance of 50 ohms. I am searching for references (books, sites, articles etc.) that can guide a beginner...
  8. 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...
  9. 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...
  10. Elazar

    High Power Piezoelectric Ultrasonic Transducer Driver

    Hi Everybody, I am working on a project that needs to drive 5 (175 watts) Piezoelectric Ultrasonic Transducers, the system needs to output clear ultrasonic sound at 40 kHz (precise sine wave) The system needs to produce a very clear sound (of course not for the human ears) of 40 kHz sine wave...