Connect with us

how does this work??

Discussion in 'General Electronics' started by jeff, Aug 9, 2003.

  1. jeff

    jeff Guest

  2. no_one

    no_one Guest

    part of a tuned "tank" or rlc circuit?
  3. Rich Grise

    Rich Grise Guest

    Yes, and yes. Actually, tha cap's leads are the antenna - sort of
    a loaded half-folded-dipole, ... nah! it's just a quarter-wave whip.
    The cap value is irrelevant. The 1458 does the detecting with the
    e-b junctions of the input transistors. And it's clearly adjustable:

    .... R5 sets the switching threshold of the second op-amp; normally it
    is adjusted so that the circuit barely triggers on background noise,
    then it's backed off a bit. The response of the circuit may be tuned
    by adjusting the length of the leads on C1. For typical road-radar
    systems, the input capacitor's leads should be about 0.5 to 0.6 inches

    So R5 adjusts the sensitivity, and the length of C1's leads set the

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Similar Threads
There are no similar threads yet.
Electronics Point Logo
Continue to site
Quote of the day