Questions tagged [inductor]
The inductor tag has no usage guidance.
23 questions
2
votes
1
answer
266
views
How best to tightly wind air core inductors?
We all know air-wound solenoid inductors. We typically wind AWG 18 to 28 UEW solid copper wire on a drill bit, pen shaft, or any other cylindrical support and remove it. The support's diameter is ...
- 1,154
6
votes
4
answers
1k
views
Why do homebrew designs wrap toroids instead of using off the shelf inductors?
Why do homebrew designs wrap toroids instead of using off the shelf inductors?
Off the shelf inductors are easily available in a range of values, including uH and even some mH. And hand wrapping ...
- 301
5
votes
2
answers
1k
views
How to design a Local Oscillator for a radio receiver?
I have decided to design a Medium Wave radio with discrete parts which won't include much complex ICs or schematics . I am thinking of designing the radio in Heterodyne mode. Which requires an ...
- 63
1
vote
1
answer
239
views
Zero resistance inductor
I have RF schematic and there is one inductor with no inductance value, but with this.
Where and how I can buy this inductance? I searched an can't find inductance with 0ohm and 1%. What 1 % does ...
- 131
9
votes
2
answers
721
views
How do you choose an inductor wire gauge for high-power RF?
At 100 watts in a 50-ohm system, the current flowing through an inductor would be about 1.41 A, thus a 26-AWG wire should be plenty since they are chassis-rated for 2A and for just a few windings that ...
- 859
3
votes
1
answer
454
views
Using PVC coated solid-core wire for a small number of turns on toroid
I'm researching making my own 49:1 unun using an appropriate mix ferrite toroid and some reasonable gauge solid-core wire. (This is for an experimental HF end-fed antenna, though this detail probably ...
user21417
6
votes
2
answers
501
views
Power rating of a selfmade air coil
A colleague was winding an air coil himself. It's a 110µH coil with 200 windings for an 80m antenna, intended to be used on a 600 W transceiver. He used a copper lacquer wire with 0.6mm diameter. ...
- 325
5
votes
1
answer
661
views
Why are loopstick ferrite antennas commonly wound with Litz wire?
What is the advantage of using Litz wire to wind ferrite (loopstick) antennas? How much of an advantage in what characteristic does this type of wire provide? (over generic single strand enameled or ...
- 13.6k
0
votes
3
answers
87
views
change LC parameter digitally
LC circuit is the main element of every frequency generator, I intend to make an FM transmitter, but many opensource circuit use analog variable L or C part to set and adjust the target frequency
My ...
6
votes
1
answer
259
views
Choice of PCB coil design for filter inductor at ca 20 to 400 MHz, 5 W
Looking at the diplexer schematic from this nice question,
I realized this can completely be done in PCB-formed elements (minus the connectors). (As a kind of counter-action to the original question'...
- 17.3k
9
votes
2
answers
2k
views
What types of materials increase the inductance of a coil when inserted inside it?
I'm asking this because of the comments in this answer, that imply that steel (mostly iron) has similar characteristics to ferrite.
Specifically, it is implied that inserting solid steel into a ...
- 8,175
5
votes
2
answers
502
views
Why are hand-wound coils so common if commercial inductors are available? [duplicate]
In most schematics of ham radio receivers and transmitters the inductor is mostly given specifically as the number of turns around some certain toroidal ferrite ring (for example). This corresponds to ...
- 624
5
votes
1
answer
585
views
How different is Q-factor of SMD inductor from regular one?
I am trying to figure out if it is possible to replace inductors like this
wound by 0.1mm (diameter) copper wire
with multilayer 0805 SMD inductors.
Those are supposed to be used inside band-pass ...
- 337
1
vote
2
answers
389
views
Rotary Inductor Replacement
I thought it was time to build a balanced-balanced antenna tuner so I mechanically ganged two B&W 3852 rotary inductors to make a balanced L network.
It appears that the 16 uH inductors I used ...
- 19
1
vote
2
answers
209
views
Inductors for Impedance Matching
I need to impedance match an IF mixer circuit to a 10.7MHz crystal filter. One of the inductors was calculated to be 44 $\mu$H. So I need a relatively large value inductance in a small package to fit ...
- 191
0
votes
1
answer
328
views
pull-up inductors for a differential PCB trace antenna
Trying to figure an antenna for the Si4012 RF chip. Page 26 of https://www.silabs.com/documents/public/application-notes/AN639.pdf talks about feeding the two sides of the loop antenna through two ...
- 225
5
votes
2
answers
485
views
In the context of the mixer in my radio, what does balanced and unbalanced mean?
I'm trying to understand how the mixer in a radio actually works, at a physics level. When looking at this article and studying the first schematic I realized I really don't understand what balanced ...
- 241
1
vote
2
answers
244
views
What dimensions to choose when winding your own inductor
Suppose you want to make a wilkinson 3-way splitter with lumped components
Given the following circuit, you need a 31.5nH inductor
The inductor can be wound various ways:
3 wdg, 1 cm diameter, 2.36 ...
- 2,195
6
votes
1
answer
1k
views
What happens to the "Yo-Yo Tenna" when you coil up its ends for use on higher frequencies?
I have gathered what is basically a Yo-Yo Tenna using some Camco laundry reels and a spool of cheap speaker wire split in half (pretty much exact duplicate of this build as it turns out). I've got a ...
- 7,469
1
vote
1
answer
344
views
Toroidal inductor and transformer basics
In basic terms, using an Ultimate3S Beacon (above) as an example, what do the various toroidal components do exactly? How do they accomplish this?
In construction terms, does it matter if the wound ...
- 356
5
votes
2
answers
1k
views
How to choose right inductors for a matching circuit
I would like to chose an inductor to make a matching circuit. Operating frequency is 6.1 GHz. I am more concerned with self resonance frequency and Q of an inductor.
Would an inductor with SRF > 7 ...
- 469
4
votes
1
answer
1k
views
How to make an inductor?
I am a high school student and am making a project on FM receiver for class 11. I am following this circuit diagram:
The L2 in this diagram is a 22µH RF Choke. The part listed in the website has the ...
- 143
4
votes
1
answer
106
views
Under what circumstance does non-toroid former lend itself to HF?
Many HF circuits posted in my copy of the ARRL manual (1972 edn - Yes, it's a vintage) appear to use a toroidal former with a coil. The same applies to HF circuits posted on the internet.
From what I ...
- 2,834