Questions About Construction Of The Australian Mystery Crystal Set

Started by Dave.H March 9, 2008
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
On Mar 10, 11:03 am, "Dave.H" <the19...@googlemail.com> 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 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"

"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
On Mar 10, 11:45 am, Eeyore <rabbitsfriendsandrelati...@hotmail.com>
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.
On 3/9/08 5:03 PM, in article
bf96e056-ebfc-4488-b9d1-20dd29d380cf@h11g2000prf.googlegroups.com, "Dave.H"
<the1930s@googlemail.com> 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.
"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
On 3/9/08 6:04 PM, in article 63jfp9F256cl0U1@mid.individual.net, "Phil
Allison" <philallison@tpg.com.au> 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 > >
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

"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