i just found a supplier of 1% 3.3mH and 33mH inductors.
The only problem is that you have to order 1000 !
Can anyone gives an idea how I am going to grab them. Can we find a reatiler for
these coils ?
As Posted In Reply To Your Post In Another Forum
Do you realise that these are US$7.29 EACH, not $7.29 per 1000?
And I think the 1% is an error; the datasheet shows 10% with 5% & 3% available as options.
But the part number indicates that these are 10% as I read it.
It's likely that you want these for DC receivers.
I bought a big lot of Toko 10PA inductors from ebay a few years ago; enough to last me the rest of my life. They weren't expensive as I recall.
It's easy to dismantle them and re-wind to get a required L; they are also adjustable.
Another option is the Amidon PC series;
Thought you might like to see what the 10PAs and the Amidon PCs look-like;
The two in front are Amidon pot-cores wound & measured for the correct L.
The ones on the audio filters board are Toko 10PA, original winding unwound, new winding put-on, measured & adjusted to exact required L.
As you can (partly) see in the notebook, it's possible to reverse-engineer by measuring L before removing the original winding and counting the number of turns removed; AL can then be calculated.
There's probably +/-10% adjustment in the 10PAs; that helps.
Look around in things like junk TV sets for pot-core type inductors.
I've never seen a 1% inductor used in the commercial world. I did use a 2% inductor for development work once for a PLL oscillator, no tuning design. The final product used a 5% 68 nH inductor.
Originally Posted by 9H1FQ
Fastron 5% shielded inductors work well in audio circuits. I have used them in diplexer and low pass filter portions of the PD and audio section of superhet receivers. Also in 40 and 20M DC receivers. Maybe this is what you are already looking at. Sorry if it is.
Sample 33mH SKU at Mouser.
The Fastrons are certainly not $2.79 each. But even at $1.20 each I understand the freight to non-US locations is an issue.
I used KK7B's 1992 article on High Performance DC Receivers as a basis but could not find TOKO 10RB's from a handy source. http://www.arrl.org/tis/info/pdf/9208019.pdf
Kerry, nice looking boards! I believe I recognize the circuits.
Yes; the layout is a dead give-away, isn't it?
Nice looking modules you have there in the picture. Sorry did not comment before, I have posted many threads and cannot catchup with them. I expect you do have a high performance reception