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Re: SolderSmoke DC Receiver Challenge
That's a neat-looking build Bill. I like the yellow trimmer capacitors in the BPF. I have a number of those that I got from Dan's Small Parts and Kits. They are 65pF, and Dan sells them for a dollar
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Dave AA7EE
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#9407
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Re: f_t checker circuit
i have a peak transistor tester, which gives me f_t but that little tester looks like a fun project and i have roughly a zillion 2N3904s, 2N2222s, etc that i could run through it, so build it i
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bill K7WXW
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#9406
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Re: f_t checker circuit
Hi Chuck,
That's an interesting circuit. It's hard to tell from your picture, but do
you have two 51 ohm resistors in parallel to ground on the "CAL" pin? Or is
that a 5 ohm resistor in parallel with
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Michael Maiorana
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#9405
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Re: SolderSmoke DC Receiver Challenge
Hi everyone,
I think you have convinced me to build it.
So, I have a few more parts to get.? No biggie.? But I have everything else.?? I have an audio transformer for a crystal radio - just not
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Daniel KK4MRN
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#9404
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Re: Building a PTO VFO
Wayne,
Thank you. I think that will work.
73 Daniel KK4MRN
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Daniel KK4MRN
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#9403
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Re: f_t checker circuit
The link in the first paragraph will get you the schematic.? Also the web page
gives details on how to make the measurements.
I'm using a MingHe MHS-5200A signal generator good to 25MHz with
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chuck adams
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#9402
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Re: f_t checker circuit
Could you post the circuit??? It looks very interesting,? very interesting.? ?Doug
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Doug Hendricks
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#9401
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f_t checker circuit
Steve, AA7U, pointed the following circuit out to me and I just
had to build one.? Didn't take too long and it seems to work
nicely.? <https://techlib.com/newprojects.htm>? Photo of my
build
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chuck adams
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#9400
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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
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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
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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
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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
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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
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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
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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
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chuck adams
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#9387
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