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need to convert from MIC level to LINE-INPUT level

Discussion in 'Electronic Repair' started by wylbur37, May 18, 2007.

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  1. wylbur37

    wylbur37 Guest

    Most portable cassette tape recorders have a MIC jack where you can
    plug in a simple microphone.

    Hpwever, some recording devices only have a LINE-INPUT jack (a.k.a.

    What I need is a little gizmo (essentially a pre-amplifier, I guess)
    that I can plug the microphone into and which in turn plugs into the
    LINE-INPUT jack.

    I'm not in a position right now to build one from scratch, so I need
    to either (a) buy one ready made or (b) buy one in kit form that I can
    assemble myself.

    Any recommendations on mail-order places that sell this?

  2. Chris

    Chris Guest

    Hi, Wylbur. A preamp is exactly what you need. If you just want a
    good bare bones preamp circuit board kit, and you have a regulated
    10-30VDC voltage source available, you could do worse than the
    Velleman K1803 preamp kit available from Jameco for $8.95.

    If you're looking for something with an enclosure, you could try the
    Elenco K-46 Stereo Preamp for $19.95. You can find a distributor at
    their website:

    Remember to avoid using a low quality power supply with preamps. Get
    a regulated linear supply.

    Good luck
  3. wylbur37

    wylbur37 Guest

    My apologies for forgetting to mention that the unit I'm looking for
    should also be compact (i.e., fits in a shirt pocket), and runs on
    either penlight or 9-volt batteries so you can take it on the road.

  4. The ONLY compact portable mic pre-amp to buy.
  5. You have got to be kidding? 1000$ for about 20$ in electronic parts and
    maybe another 20-30 in manufacturing?

    That site is about the biggest scam site I have seen in a while. MAybe they
    meant yen instead of USD?
  6. UCLAN

    UCLAN Guest

    Over a hundred to choose from at:

    I like:
  7. Marra

    Marra Guest

  8. Eeyore

    Eeyore Guest

  9. Eeyore

    Eeyore Guest
  10. That would matter for a portable cassette recorder? ;-)
  11. Eeyore

    Eeyore Guest

    Actually he didn't mention the recording device itself.

  12. True - but the implication is it's for this sort of use. If you were
    aiming for a high quality recording from a mic you'd use an external mixer
    to provide phantom power etc as well. Very few high quality self contained
    recorders that have a mic input exist on the domestic market as there's
    little demand for them, and making that mic amp side to a high standard
    for practical use isn't as easy as it might seem.
  13. CWatters

    CWatters Guest

  14. Alec Baldwin You Ain't!
  15. clifto

    clifto Guest

    This complaint, from someone whose recommendation required the Javascript
    virus installer?
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