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this is what I get from my amp. ear.

Discussion in 'Electronic Basics' started by Johan Wagener, Aug 11, 2004.

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  1. All connections double checked. All transistors checked and the all
    have 0.8V on BE. Except for transistor 2 which has 1V over its BE?

    Mic is a brand new miniature electret microphone which runs on 1V-10V
    with 2Vnom

    I don't even pick up the mains hum when I touch the input. I do
    however get a small amplification of the microphone and when I connect
    a 3V supply to the circuit I can hear sounds picked up by the mic, but
    it is very faint.

    Should I perhaps try using a LM741 as a preamp for the mic and then
    send this signal into the Amplified Ear?

    BTW, the circuit can be found at
    http://www.electronics-lab.com/projects/audio/023/

    Please send your suggestions
     
  2. Graham Knott

    Graham Knott Guest

    --
    Measure emitter, base and collector voltages with respect to the negative
    supply for all transistors and post them here (unless you've already done
    so)
    ..
    My most up-to-date website
    Electronics for Beginners & Intermediate Electronics
    http://homepage.ntlworld.com/g.knott/index.htm
     
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