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Recent content by DominicNewbie

  1. D

    Problem with new microphone preamp.

    Updated. Thanks for help. I just had to reduce value of capacitance capacitor. @BobK I looked at LT Spice scheme and did it. Current amplification is quite good, anyway I have to reduce input wire because it's like an antenna. :)
  2. D

    Problem with new microphone preamp.

    I have modified this circuit due to your tips. Now it has large self noise. I have to blow into microphone capsule, to see amplitude changes. Hmm, I checked twice. First transistor is nearest microphone input. I moved circuit into mounting plate.
  3. D

    Problem with new microphone preamp.

    Do I think properly?
  4. D

    Problem with new microphone preamp.

    Updated Cicruit with one capacitor at input (main scheme) works. My voice can be heared, when I speak into electret microphone capsule. Anyway it's clipped. How can I change gain in this circuit ? :)
  5. D

    Problem with new microphone preamp.

    Yes, I connected microphone input to + of capacitor. Should I try? I remember this circuit above was working fine. Moreover I use standard 2.2k electret Microphone.
  6. D

    Problem with new microphone preamp.

    Thank you for answer, So that microphone preamplifier works but my sound card probably doesn't recognize such big signal. I need to change gain or output signal? I also read in Wikipedia about Line level siganls. https://en.wikipedia.org/wiki/Line_level#Nominal_levels
  7. D

    Problem with new microphone preamp.

    Hi guys. I have just designed my new microphone preamplifier basen on two BC549C transistors. I used scheme found in Internet. Many people have successfully made this circuit and it works for line level. I made one too, but it doesn't works. I'm looking at scheme and amplifier and wondering...
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