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Re: SolderSmoke DC Receiver Challenge
I found solder smoke page on glue stick PTO. Just uses original glue and a toroid inside, coil around the glue stick. Looks like fun. Practical.
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Curt
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#9399
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Building a PTO VFO
Daniel,
A PTO VFO is a pretty simple beast, and the tuning coil arrangement is very easy and cheap to build.
I use some small pieces of double sided PCB material, a brass screw and brass nuts, a
By
Wayne McFee
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#9398
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Re: SolderSmoke DC Receiver Challenge
I have been working on the soldersmoke DC receiver in between batches of good weather and the weather has been unseasonably good, so it has been a little slow. I finished the audio amp a couple of
By
bill K7WXW
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#9397
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Re: SolderSmoke DC Receiver Challenge
Yes here is another one.
https://zl2pd.com/ptovfo.html
Worthwhile to experience a PTO at least once. I have two kits containing a PTO. NC2030 and 4state Cyclone.
But nothing sacred about using a
By
Curt
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#9396
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Re: SolderSmoke DC Receiver Challenge
There is a good chance that your local public library has a 3D printer that you might be able to use. If not at the library, ask around in your local ham club. That's one good reason to belong to a
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Karl Heinz Kremer - K5KHK
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#9394
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Re: SolderSmoke DC Receiver Challenge
That's a nifty little kit Chuck.
Dave
AA7EE
By
Dave AA7EE
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#9393
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Re: SolderSmoke DC Receiver Challenge
Daniel
Hey don't let one or two stumbling blocks stop you from a project. You can start with a vxo just get in it working, and later change to a vfo or pto. Improvise a bit.
I am headed there now to
By
Curt
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#9392
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Re: Honbay trimmers; I took one for the team
I received my order today.? For less than the price of well anything these days these aren't any worse than I was expecting.? They are the same cheapo brown plastics ones that everyone sells.? My
By
Doug W
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#9391
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Re: SolderSmoke DC Receiver Challenge
Hi Daniel,
This is a good place to start!
https://hackaday.io/project/190327-high-schoolers-build-a-radio-receiver
As Chuck mentioned you can get a nice PTO from
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Alan N8WQ
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#9390
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Re: Source for 88 millihenry inductors?
The only ones I've found are potted and at ghastly prices.
I haven't seen the unpotted ones like in articles in articles
in over 45years.
Allison
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ajparent1/kb1gmx
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#9389
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Source for 88 millihenry inductors?
Does anyone know of a source for 88 millihenry (88 mH) inductors? These were originally used by the phone company on telephone lines, and then later repurposed for use in the passive audio filters
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Douglas Quagliana
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#9388
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L/C Meter Test
Steve R. sent me some mica caps rated at +-1% for use as
pseudo-standard for capacitance checks.? Thanks Steve.
I'm sending him some transistors for his effort.
Here is a comparison between his
By
chuck adams
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#9387
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Re: SolderSmoke DC Receiver Challenge
With nothing more than some nylon bolts and nuts, some hot glue, and the
required brass bolt, and maybe some PCB material for structure, you could
make the knob stationary, and make the coil the thing
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Ryan Flowers
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#9386
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Re: SolderSmoke DC Receiver Challenge
There's a complete YouTube series on building this, each module has its own video, done by Dean KK4DAS. There are two folks who are 3D printing the inductor assembly and making them available just for
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Steve Ratzlaff
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#9385
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Re: SolderSmoke DC Receiver Challenge
If budget is not an issue:
<https://qrpbuilder.com/pto_mechanism>
FYI
--
chuck adams, aa7fo
QRP WAS 17m started Apr 2, 2025
WAS-17 QRP --> TX,FL,SC,GA,OK,AR,KS,AL,AZ,MN
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chuck adams
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#9384
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Re: SolderSmoke DC Receiver Challenge
Not ashamed to have built many projects with hot glue and velcro strips.
KB9BVN
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Brian KB9BVN
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#9383
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Re: SolderSmoke DC Receiver Challenge
I can think of lots of ways to build that without a 3d printer. They all
involve hot glue ;)
<daniel-kk4mrn.skipper529@...> wrote:
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Ryan Flowers
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#9382
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Re: SolderSmoke DC Receiver Challenge
Hi Alan,
I have looked at it, but I do not know where to begin.
Besides, it needs a PTO.? I do not have a 3D printer to make the part.
I think one ham used a fix frequency oscillator in place of
By
Daniel KK4MRN
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#9381
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SolderSmoke DC Receiver Challenge
Gang,
I accepted the Soldersmoke DC Receiver Challenge on April 19th.
Here is my 3 stage audio amplifier I finished this morning.
Please join in on the fun!
73,
Alan, N8WQ
By
Alan N8WQ
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#9380
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You are invited to Pacificon
Pacificon 25 is going to be remembered as the return of qrp year.? You can register and get your hotel room at Pacificon25.org for the 3 day conference that will be held the second weekend of
By
Doug Hendricks
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#9379
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