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Recent content by john.nash

  1. J

    Op amp low pass active filter

    The circuit is part of a receiver, the signal is demodulated with a mixer and is about 600 Hz. That is the input of the circuit (1 and 2). The manufacturer says that it is an amplifier.
  2. J

    Op amp low pass active filter

    I see 5V in the output.
  3. J

    Op amp low pass active filter

    But the input 1 and 2 is the same, that is what I don't understand, if it is a differential amplifier how can be the signal amplified if the difference is zero. I put the capacitors and it's the same.
  4. J

    Op amp low pass active filter

    This is the simulation
  5. J

    Op amp low pass active filter

    Thanks godfreyl, but I simulated this circuit in LTSpice (without the input capacitors) and I obtained 5V at the output. The input was a sine signal of 1 V of peak and 600 Hz. So I don't understand what's happening.
  6. J

    Op amp low pass active filter

    Hello, The circuit attached is a low pass active filter, using a differential amplifier, but I don't know how it works. The inputs are the same signal, so I don't know how to obtain the gain. Thanks in advance.
  7. J

    A question about a MOSFET circuit in a transceiver

    Ok BigBoss, but I don't understand what it's doing. I simulated with LTSpice supposing that Rx_IN is a pulse signal and I obtained that Vout was a reduced version of Rx_IN. Do you think that this is its purpose?
  8. J

    Miniaturizing a VHF antenna

    Hi, I'm trying to design an antenna in VHF band to receive NOAA's images. The center frequency is 137.5 MHz and I need to make an small antenna. I think that a printed antenna is the best choice, so I searched some information and I found some type of antennas, like meander-line and spiral...
  9. J

    A question about a MOSFET circuit in a transceiver

    Hi, I have a question about the circuit in the picture. It's part of a CW receiver. The Rx_In signal comes from the antenna (low pass filtered) and the output goes to a BPF centered in the receiving frequency and then the signal it's mixed and demodulated. I don't understand the part of the...
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