Questions About Construction Of The Australian Mystery Crystal Set

Discussion in 'Electronic Basics' started by Dave.H, Mar 10, 2008.

  1. Dave.H

    Dave.H Guest

    I've been looking at a number of simple crystal radio designs, and
    I've found the Australian mystery crystal set, and am interested in
    building that, mainly because it's an Australian design, and I've
    heard it it's a pretty good performer. I only have 2 questions- can I
    substitute the detector for a 1N34? and what is double silk covered
    wire and do I really have use that? What's wrong with regular coil
    wire? I can only find 23 SWG, 25 SWG, and 33 SWG where I need 24 SWG,
    30 SWG.

    Thanks

    Dave
     
    Dave.H, Mar 10, 2008
    #1
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  2. Dave.H

    Dave.H Guest

    Re: Questions About Construction Of The Australian Mystery CrystalSet

    On Mar 10, 11:03 am, "Dave.H" <> wrote:
    > I've been looking at a number of simple crystal radio designs, and
    > I've found the Australian mystery crystal set, and am interested in
    > building that, mainly because it's an Australian design, and I've
    > heard it it's a pretty good performer. I only have 2 questions- can I
    > substitute the detector for a 1N34? and what is double silk covered
    > wire and do I really have use that? What's wrong with regular coil
    > wire? I can only find 23 SWG, 25 SWG, and 33 SWG where I need 24 SWG,
    > 30 SWG.
    >
    > Thanks
    >
    > Dave


    Forgot to give the schematic
    http://www.clarion.org.au/crystalset/mystery.html
     
    Dave.H, Mar 10, 2008
    #2
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  3. Dave.H

    Eeyore Guest

    "Dave.H" wrote:

    > what is double silk covered wire


    It's wire insulated with silk.

    > and do I really have use that?


    Not unless you want it to be 'period authentic'.

    Graham
     
    Eeyore, Mar 10, 2008
    #3
  4. Dave.H

    Dave.H Guest

    Re: Questions About Construction Of The Australian Mystery CrystalSet

    On Mar 10, 11:45 am, Eeyore <>
    wrote:
    > "Dave.H" wrote:
    > > what is double silk covered wire

    >
    > It's wire insulated with silk.
    >
    > > and do I really have use that?

    >
    > Not unless you want it to be 'period authentic'.
    >
    > Graham


    Not really, I'm building it on a metal chassis (coil mounted above,
    vertically) and don't really care about vintage looks. I can't seem to
    find wire of the right diameter, though, that's the only part I've yet
    to find.
     
    Dave.H, Mar 10, 2008
    #4
  5. Dave.H

    Don Bowey Guest

    Re: Questions About Construction Of The Australian MysteryCrystal Set

    On 3/9/08 5:03 PM, in article
    , "Dave.H"
    <> wrote:

    > I've been looking at a number of simple crystal radio designs, and
    > I've found the Australian mystery crystal set, and am interested in
    > building that, mainly because it's an Australian design, and I've
    > heard it it's a pretty good performer. I only have 2 questions- can I
    > substitute the detector for a 1N34? and what is double silk covered
    > wire and do I really have use that? What's wrong with regular coil
    > wire? I can only find 23 SWG, 25 SWG, and 33 SWG where I need 24 SWG,
    > 30 SWG.
    >
    > Thanks
    >
    > Dave


    That's a great looking radio.

    Use 23 or 25 or whatever is handy. The significant difference between
    cotton covered and enamel covered wires is that cotton spaces the wires a
    little farther apart than will the enamel, and it will take slightly more
    cotton covered wire to lay on the same number of turns as the enamel wire.
    Bottom line is, the two coils would have slightly difference inductive
    reactance. The turns count is probably a swag anyhow, and it's the reason
    most xtal sets using wound coils, put on lots of turns with taps so the
    range of tuning can be easily changed (hint, hint).

    I don't know what a really good replacement for the 1N34 would be. I'd look
    for a Hot Carrier diode if nobody comes up with a part number. From an
    occasionally defective memory, I think the 1N82 may be one.
     
    Don Bowey, Mar 10, 2008
    #5
  6. Dave.H

    Phil Allison Guest

    Re: Questions About Construction Of The Australian MysteryCrystal Set

    "Donald Duck Bowey"

    >> I only have 2 questions- can I
    >> substitute the detector for a 1N34?

    >
    >
    > I don't know what a really good replacement for the 1N34 would be.



    ** Try reading the damn question - fuckwit.



    ........ Phil
     
    Phil Allison, Mar 10, 2008
    #6
  7. Dave.H

    Jamie Guest

    Re: Questions About Construction Of The Australian Mystery CrystalSet

    Dave.H wrote:

    > I've been looking at a number of simple crystal radio designs, and
    > I've found the Australian mystery crystal set, and am interested in
    > building that, mainly because it's an Australian design, and I've
    > heard it it's a pretty good performer. I only have 2 questions- can I
    > substitute the detector for a 1N34? and what is double silk covered
    > wire and do I really have use that? What's wrong with regular coil
    > wire? I can only find 23 SWG, 25 SWG, and 33 SWG where I need 24 SWG,
    > 30 SWG.
    >
    > Thanks
    >
    > Dave


    http://www.rwonline.com/pages/s.0055/t.5708.html
    Read that, it's interesing., don't know if it'll
    help you how ever. I'm guessing that if you used enamel
    wire you would be fine for what you're doing.
    --
    http://webpages.charter.net/jamie_5"
     
    Jamie, Mar 10, 2008
    #7
  8. Dave.H

    Don Bowey Guest

    Re: Questions About Construction Of The Australian MysteryCrystalSet

    On 3/9/08 6:04 PM, in article , "Phil
    Allison" <> wrote:

    >
    > "Donald Duck Bowey"
    >
    >>> I only have 2 questions- can I
    >>> substitute the detector for a 1N34?

    >>
    >>
    >> I don't know what a really good replacement for the 1N34 would be.

    >
    >
    > ** Try reading the damn question - fuckwit.
    >

    Sorry grampa. I'll try to do better next time.

    If you keep using those naughty words I'm going to tell on you.

    >
    >
    > ....... Phil
    >
    >
     
    Don Bowey, Mar 10, 2008
    #8
  9. Dave.H

    ehsjr Guest

    Re: Questions About Construction Of The Australian Mystery CrystalSet

    Dave.H wrote:
    > I've been looking at a number of simple crystal radio designs, and
    > I've found the Australian mystery crystal set, and am interested in
    > building that, mainly because it's an Australian design, and I've
    > heard it it's a pretty good performer. I only have 2 questions- can I
    > substitute the detector for a 1N34? and what is double silk covered
    > wire and do I really have use that? What's wrong with regular coil
    > wire? I can only find 23 SWG, 25 SWG, and 33 SWG where I need 24 SWG,
    > 30 SWG.
    >
    > Thanks
    >
    > Dave


    You can use regular coil wire of whatever size you
    can get that is close, and the 1N34 is fine as the
    detector.

    Ed
     
    ehsjr, Mar 10, 2008
    #9
  10. Dave.H

    Eeyore Guest

    "Dave.H" wrote:

    > can I substitute the detector for a 1N34?


    You might do rather well with a zero bias schottky diode.

    Failing that, any germamium point-contact type (like the 1N34) would be a
    decent sub.

    Graham
     
    Eeyore, Mar 10, 2008
    #10
  11. Dave.H

    Dave.H Guest

    Re: Questions About Construction Of The Australian Mystery CrystalSet

    On Mar 10, 5:53 pm, Eeyore <>
    wrote:
    > "Dave.H" wrote:
    > > can I substitute the detector for a 1N34?

    >
    > You might do rather well with a zero bias schottky diode.
    >
    > Failing that, any germamium point-contact type (like the 1N34) would be a
    > decent sub.
    >
    > Graham


    I'll go with the 1N34. I'm also going to install a 1S5 tube as a
    second detector, switchable between the two, with a 'D' cell powering
    the filament.
     
    Dave.H, Mar 10, 2008
    #11
  12. Dave.H

    amdx Guest

    "Dave.H" <> wrote in message
    news:...
    > On Mar 10, 5:53 pm, Eeyore <>
    > wrote:
    >> "Dave.H" wrote:
    >> > can I substitute the detector for a 1N34?

    >>
    >> You might do rather well with a zero bias schottky diode.
    >>
    >> Failing that, any germamium point-contact type (like the 1N34) would be a
    >> decent sub.
    >>
    >> Graham

    >
    > I'll go with the 1N34. I'm also going to install a 1S5 tube as a
    > second detector, switchable between the two, with a 'D' cell >powering the
    > filament.


    Hi Dave,
    I almost feel bad giving you this URL, it is so full of useful information
    that it may be a while before you have time to get anything done. See
    section 1. Out of the 29 atricles, I think 5 or 6 are about how to improve
    the diode/detector operation. Oh, and see #19, Ben discusses the 1932
    "Mystery Crystal Radio"
    http://www.bentongue.com/xtalset/xtalset.html
    Have fun, Mike
    *and what's this stuff about a D cell on a crystal radio :)
     
    amdx, Mar 10, 2008
    #12
  13. Dave.H

    whit3rd Guest

    Re: Questions About Construction Of The Australian Mystery CrystalSet

    On Mar 10, 12:11 am, "Dave.H" <> wrote:

    > I'll go with the 1N34.  I'm also going to install a 1S5 tube as a
    > second detector, switchable between the two, with a 'D' cell powering
    > the filament.


    Gack! How about using a transistor (base -emitter of PN3904 connect
    B to coil, E to phones), and a 1k resistor from the collector to
    battery (+)?
    Battery (-) to ground.

    Or go low-tech and use a two-potato battery.

    <http://www.ehow.com/how_18637_make-potato-clock.html>
     
    whit3rd, Mar 10, 2008
    #13
  14. Dave.H

    Dave.H Guest

    Re: Questions About Construction Of The Australian Mystery CrystalSet

    On Mar 11, 6:05 am, "amdx" <> wrote:

    *and what's this stuff about a D cell on a crystal radio :)

    I got the idea from one of Dave Schmarder's radios, #26

    http://www.schmarder.com/radios/crystal/26.htm
     
    Dave.H, Mar 11, 2008
    #14
  15. Dave.H

    amdx Guest

    "Dave.H" <> wrote in message
    news:...
    > On Mar 11, 6:05 am, "amdx" <> wrote:
    >
    > *and what's this stuff about a D cell on a crystal radio :)
    >
    > I got the idea from one of Dave Schmarder's radios, #26
    >
    > http://www.schmarder.com/radios/crystal/26.htm


    Hi Dave,
    My point was, the purists would shudder at the thought of an external
    power source on a crystal radio. Now if you extract the power from a strong
    local and use that to amplify a weak signal then your doing good work.
    Mike
     
    amdx, Mar 11, 2008
    #15
  16. Dave.H

    Sjouke Burry Guest

    Re: Questions About Construction Of The Australian Mystery CrystalSet

    Dave.H wrote:
    > On Mar 10, 11:45 am, Eeyore <>
    > wrote:
    >> "Dave.H" wrote:
    >>> what is double silk covered wire

    >> It's wire insulated with silk.
    >>
    >>> and do I really have use that?

    >> Not unless you want it to be 'period authentic'.
    >>
    >> Graham

    >
    > Not really, I'm building it on a metal chassis (coil mounted above,
    > vertically) and don't really care about vintage looks. I can't seem to
    > find wire of the right diameter, though, that's the only part I've yet
    > to find.


    A metal chassis can influence performance very much,
    because metal in front of a coil acts as a shorted
    winding.
    I advise to test things without a chassis, on a non-metal
    table surface, and when it performs as intended,
    try it in your metal housing.
    I would choose a wooden or plastic box however.
     
    Sjouke Burry, Mar 11, 2008
    #16
  17. Dave.H

    Don Bowey Guest

    Re: Questions About Construction Of The Australian MysteryCrystal Set

    On 3/11/08 5:15 AM, in article 91512$47d674c2$18d6b40c$,
    "amdx" <> wrote:

    >
    > "Dave.H" <> wrote in message
    > news:...
    >> On Mar 11, 6:05 am, "amdx" <> wrote:
    >>
    >> *and what's this stuff about a D cell on a crystal radio :)
    >>
    >> I got the idea from one of Dave Schmarder's radios, #26
    >>
    >> http://www.schmarder.com/radios/crystal/26.htm

    >
    > Hi Dave,
    > My point was, the purists would shudder at the thought of an external
    > power source on a crystal radio. Now if you extract the power from a strong
    > local and use that to amplify a weak signal then your doing good work.
    > Mike
    >
    >


    The tube isn't being used as an amplifier, it's diode is used as a
    switchable option to a SS diode. The battery is for it's filament.
     
    Don Bowey, Mar 11, 2008
    #17
  18. Dave.H

    amdx Guest

    Re: Questions About Construction Of The Australian MysteryCrystal Set

    "Don Bowey" <> wrote in message
    news:C3FBEB75.B1D97%...
    > On 3/11/08 5:15 AM, in article 91512$47d674c2$18d6b40c$,
    > "amdx" <> wrote:
    >
    >>
    >> "Dave.H" <> wrote in message
    >> news:...
    >>> On Mar 11, 6:05 am, "amdx" <> wrote:
    >>>
    >>> *and what's this stuff about a D cell on a crystal radio :)
    >>>
    >>> I got the idea from one of Dave Schmarder's radios, #26
    >>>
    >>> http://www.schmarder.com/radios/crystal/26.htm

    >>
    >> Hi Dave,
    >> My point was, the purists would shudder at the thought of an external
    >> power source on a crystal radio. Now if you extract the power from a
    >> strong
    >> local and use that to amplify a weak signal then your doing good work.
    >> Mike
    >>
    >>

    >
    > The tube isn't being used as an amplifier, it's diode is used as a
    > switchable option to a SS diode. The battery is for it's filament.


    Ok then, the purists would shudder at the thought of an external
    power source on a crystal radio. Now if you extract the power from a strong
    local and use that to bias your diode then your doing good work.
    Gees Don, your acting like Phil but without the name calling :)
    Mike


    >
     
    amdx, Mar 11, 2008
    #18
  19. Dave.H

    Steven Swift Guest

    "Dave.H" <> writes:

    >On Mar 10, 11:03 am, "Dave.H" <> wrote:
    >> I've been looking at a number of simple crystal radio designs, and
    >> I've found the Australian mystery crystal set, and am interested in
    >> building that, mainly because it's an Australian design, and I've
    >> heard it it's a pretty good performer. I only have 2 questions- can I
    >> substitute the detector for a 1N34? and what is double silk covered
    >> wire and do I really have use that? What's wrong with regular coil
    >> wire? I can only find 23 SWG, 25 SWG, and 33 SWG where I need 24 SWG,
    >> 30 SWG.
    >>
    >> Thanks
    >>
    >> Dave


    >Forgot to give the schematic
    >http://www.clarion.org.au/crystalset/mystery.html


    Substitutes will work fine. All the other stuff is to make it look like
    a "period piece." Go to a rock shop and get some galena for the detector
    if you want to go retro.

    Steve.
    --
    Steven D. Swift, , http://www.novatech-instr.com
    NOVATECH INSTRUMENTS, INC. P.O. Box 55997
    206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA
     
    Steven Swift, Mar 12, 2008
    #19
  20. Dave.H

    Don Bowey Guest

    Re: Questions About Construction Of The Australian MysteryCrystalSet

    On 3/11/08 3:51 PM, in article 47475$47d70c71$45013908$,
    "amdx" <> wrote:

    >
    > "Don Bowey" <> wrote in message
    > news:C3FBEB75.B1D97%...
    >> On 3/11/08 5:15 AM, in article 91512$47d674c2$18d6b40c$,
    >> "amdx" <> wrote:
    >>
    >>>
    >>> "Dave.H" <> wrote in message
    >>> news:...
    >>>> On Mar 11, 6:05 am, "amdx" <> wrote:
    >>>>
    >>>> *and what's this stuff about a D cell on a crystal radio :)
    >>>>
    >>>> I got the idea from one of Dave Schmarder's radios, #26
    >>>>
    >>>> http://www.schmarder.com/radios/crystal/26.htm
    >>>
    >>> Hi Dave,
    >>> My point was, the purists would shudder at the thought of an external
    >>> power source on a crystal radio. Now if you extract the power from a
    >>> strong
    >>> local and use that to amplify a weak signal then your doing good work.
    >>> Mike
    >>>
    >>>

    >>
    >> The tube isn't being used as an amplifier, it's diode is used as a
    >> switchable option to a SS diode. The battery is for it's filament.

    >
    > Ok then, the purists would shudder at the thought of an external
    > power source on a crystal radio. Now if you extract the power from a strong
    > local and use that to bias your diode then your doing good work.
    > Gees Don, your acting like Phil but without the name calling :)
    > Mike



    Geez Mike, why didn't you take time to see what the OP was doing?

    If you wish to really be a purist you should insist one should use a coherer
    for the detector, or a chunk of galena and a cats-whisker.

    I think it's a bit cool to have two different detectors and be able to
    switch between them, like in the good old days.
     
    Don Bowey, Mar 12, 2008
    #20
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