Make a 2 tenth MicroHenry Inductor | DIY TV Transmitter

  • Thread starter Thread starter BrockLee
  • Start date Start date
Click For Summary

Discussion Overview

The discussion revolves around the challenge of creating a 0.2 microHenry inductor for use in a DIY TV transmitter. Participants explore various methods for constructing the inductor, share resources, and discuss related components and regulations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant notes the difficulty in sourcing a 0.2 microHenry inductor and suggests that wrapping wire around a resistor could create an inductor, depending on wire gauge and number of turns.
  • Another participant proposes using 22 gauge magnet wire and a 1K resistor to create the inductor, but expresses concern about the time required to achieve the precise value needed.
  • A participant mentions that the calculations for coil windings are based on air-cored inductors, which may not be suitable for the small size of their project.
  • Some participants discuss the possibility of using standard values for inductors, suggesting that a 0.22 microHenry inductor could be a viable alternative.
  • Several participants share links to online resources, including Digikey, for sourcing inductors and components.
  • There is a clarification regarding the value of inductance being discussed, with one participant questioning whether it is 10nH or 20nH, indicating some confusion about the specifications.
  • One participant mentions the FCC regulations for broadcasting analog TV after the digital conversion, seeking input on power output levels.

Areas of Agreement / Disagreement

Participants express various methods and ideas for constructing the inductor, but there is no consensus on the best approach or the exact specifications needed. Disagreement exists regarding the precise value of inductance and the feasibility of creating the inductor as described.

Contextual Notes

Participants reference calculations and charts for coil windings, but there are limitations in the assumptions made regarding the type of inductor and its application in the TV transmitter context. The discussion also touches on regulatory aspects that remain unresolved.

BrockLee
Messages
30
Reaction score
0
Maybe your all aware of the easily available kits found online without retailers, maybe I can give you an idea of why. I got one and it's lacking an inductor. 2tenth of a MicroHenry as the other that came with it. Not only does this piece not exist in electronics shops but I can't even get it off of the internet. Now I have seen an identical purpose homemade inductor on the ipodlinux website, Oddly enough it is for boosting signal range on ipod FM transmitters. Anyway, It claimed a wrapping of wire around a resistor would be (depending on its gauge, number of turns, and if the resistor is a small resistor like mOhm) equal to an amount of henrys, used for smoothing a signal. Now if this is not a load of Bull, Maybe someone has an idea on how to make a two tenth microHenry Inductor so I can use My TV Transmitter Hmm.?
 
Engineering news on Phys.org
Update If you want take a look and see if this is correct info
http://www.ipodwizard.net/wiki/index.php/ITrip_Amplifier
to amplify the Itrip attachment for ipods. I busted Mine.
 
Last edited by a moderator:
BrockLee said:
Maybe your all aware of the easily available kits found online without retailers, maybe I can give you an idea of why. I got one and it's lacking an inductor. 2tenth of a MicroHenry as the other that came with it. Not only does this piece not exist in electronics shops but I can't even get it off of the internet. Now I have seen an identical purpose homemade inductor on the ipodlinux website, Oddly enough it is for boosting signal range on ipod FM transmitters. Anyway, It claimed a wrapping of wire around a resistor would be (depending on its gauge, number of turns, and if the resistor is a small resistor like mOhm) equal to an amount of henrys, used for smoothing a signal. Now if this is not a load of Bull, Maybe someone has an idea on how to make a two tenth microHenry Inductor so I can use My TV Transmitter Hmm.?

Most electronics shops should sell coils. You can order online if your local supplier doesn't have any. Yes, you can build a coil by wrapping insulated wire around itself. What do you mean by busting yours?

http://en.wikipedia.org/wiki/Inductor
 
why not just pick up the 22ga magnet wire and a 1K resistor and wrap one up?
 
Proton Soup said:
why not just pick up the 22ga magnet wire and a 1K resistor and wrap one up?

With the TV transmitter I own it would take much too time to keep rewiring until I get two tenth of a MicroHenry(Thats Ten to the Negative Sixth). I did the equations for determining how many coils per coil diameter (thank you Ametuer Radio Relay Leagues Handbook), as well I looked up the coil windings in a chart to find a suitable size, but it occures to me this is for air cored inductors. Very easy to break and my case is Tiny.
I am still searching for a better way and as of yet(6 months ~14days), I am nill for a better solution.
OH and by the way if anyone has any ideas about the fcc's regulations for broadcasting analog tv after the digital conversion i'd appreciate it, i don't think that the fcc regulated maximum power output is enough, I want to atleast cover my backyard(70dB) or so. lol
 
your link actually indicates 10uH (1 times ten to the negative FIVE). other than that, i can't tell if you're asking for a 10 or 20nH (2 times ten to the negative eight) or something else.

and after 6 months, i think you could've wound a few hundred coils. ;) the image there suggests 10 to 20, so you need enough material for 11 prototypes...
 
yungman said:
Check Digikey?

Perhaps this one:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=513-1594-1-ND

EDIT: whoa, that's a surface-mount component. But you can search online at digikey and see if they have a lead-wire type.

EDIT #2: here's one with leads:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=513-1518-ND
 
0.2 microHenry is only about 6 inches of 22 awg. If you coil it up, it can be even shorter. Is this the for-real value?
 
  • #10
TVP45 said:
0.2 microHenry is only about 6 inches of 22 awg. If you coil it up, it can be even shorter. Is this the for-real value?

In my opinion, you can change the value of other components a little to use a 0.22uH which is a standard value. Engineering is a art of complemise! It is very important to know what is the standard value of resistors, caps, and inductors and start off design with that in mind so you don't end up with odd values. I designed precission circuits before, very very few times I need to get specialty values except for resistors which is the easiest of the three.