Yaesu FL-2100B - Optoisolator Keying?

Discussion in 'Amateur Radio Amplifiers' started by MM0IMC, Mar 4, 2012.

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  1. MM0IMC

    MM0IMC Guest

    Hi folks,

    I've already built a 12V DC relay keying interface (buffer) for a Yaesu FL-2100B amplifier and it works a treat.

    I've tried to build one based around a 4N35 optoisolator without much joy. :( I'm no whiz kid with electronics so please be patient with me, but I guess I'm trying to figure a way of using the optoisolator to switch the amp's negative voltage to ground (-16V/125mA). I don't know if adding a switching transistor at the output of the 4N35 would help, I've got a BC548B available.

    http://i6.photobucket.com/albums/y218/merlin100/1.jpg
    http://i6.photobucket.com/albums/y218/merlin100/Picture011-2.jpg
    http://i6.photobucket.com/albums/y218/merlin100/Picture009.jpg

    Any ideas would be most helpful.

    73,

    Ian - MM0IMC.

    ps: It's my club's amp, so I can't get to test the circuit until I do my fortnightly visit.
     
  2. W9GB

    W9GB Ham Member QRZ Page

    Mike Higgins, K6AER supplied this keying circuit using a 2N2222A and the IRD-610 for the SB-200 on eHam.net
    http://www.eham.net/articles/23070

    Jackson Harbor Press: Chuck Olsen, WB9KZY
    KeyAll circuit uses the PV15080N and IRF-820 (2 devices)
    http://wb9kzy.com/keyall.htm
    Schematic diagram
    http://wb9kzy.com/keyall.pdf

    Gary Nichols, KD9SV packages the KeyAll board into an external case for his product
    http://www.radiobooks.com/products/svkr.htm

    Harbach Electronics SK-201 -- Soft-Key
    Harbach used the 4N33 Optocoupler with IRF9610 MOSFET.
    www.harbachelectronics.com/_mgxftp/pdffiles/SK-201.PDF

    Icom America - Service has suggested this solid-state circuit in the past
    http://www.qsl.net/icom/ampcontrol.html
    ==
    w9gb
     
    Last edited: Mar 4, 2012
  3. AG6K

    AG6K QRZ Member QRZ Page

     The electronic cathode bias switch (Q1 - Q2) in:
    http://www.somis.org/HSS-diagram.jpg
    Will switch T/R bias in tubes that draw up to 5A.

    .
     
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