walid Posted September 8, 2005 Report Share Posted September 8, 2005 how can i wound 100 uH coil Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 8, 2005 Report Share Posted September 8, 2005 I use this on in my FM transmitter: Quote Link to comment Share on other sites More sharing options...
Staigen Posted September 8, 2005 Report Share Posted September 8, 2005 I use this on in my FM transmitter:Eh, 100 uH?//Staigen Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 8, 2005 Report Share Posted September 8, 2005 Hi Staigen,Didn't you see my FM transmitter? I found some tiny variable caps to tune it, it has a low-distortion preamp with proper selectable pre-emphasis, the preamp and oscillator have a low-dropout regulator, it has an RF amplifier/buffer so that it doesn't change its tuning if something gets near the antenna and its range is more than about 2km. My FM band is full, so to test it I had to use the same frequency as a foreign-language low-power station on the other side of my city. ;D Quote Link to comment Share on other sites More sharing options...
Guest Alun Posted September 8, 2005 Report Share Posted September 8, 2005 That looks more like 100nH than 100uH to me. ;D Quote Link to comment Share on other sites More sharing options...
Staigen Posted September 8, 2005 Report Share Posted September 8, 2005 To AudioguruYes, i have seen it before, here on the board, a nice little thing, built on a wero and all! Nice! ;D ;DBTW, have you notice my message(question)?To AlunI agree with you, suddenly not 100uH!//Staigen Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 8, 2005 Report Share Posted September 8, 2005 Hi Staigen,You are absolutely correct! My coils are only 100nH. I think Walid recently posted an FM transmitter circuit using 100uH by mistake and I didn't notice its error. :-[ Quote Link to comment Share on other sites More sharing options...
Staigen Posted September 8, 2005 Report Share Posted September 8, 2005 Hey Audioguru, did you get my message?//Staigen Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 8, 2005 Report Share Posted September 8, 2005 Yes I did and I replied with a link to millions of these thingys: Quote Link to comment Share on other sites More sharing options...
walid Posted September 10, 2005 Author Report Share Posted September 10, 2005 OK OK guys it is 100uH coil and i can't purchase it, can i use a piece of ferrite rod and wound some turns on it? IF this OK what values (rod length and diameter, n turns etc) Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 10, 2005 Report Share Posted September 10, 2005 Our 3W FM transmitter project uses a few RF chokes and tells how to make them:http://www.electronics-lab.com/projects/rf/016/index.htmlOne of our 4W FM transmitter projects also uses RF chokes but its translation is difficult to understand. Quote Link to comment Share on other sites More sharing options...
walid Posted September 10, 2005 Author Report Share Posted September 10, 2005 I go to the 3W FM transmitter project which uses five RF chokes==> L2,L3,L5,L7,L9 5 6-hole Ferroxcube Wide band HF Choke (5 WDG)but i can't understand anything from this "6-hole Ferroxcube Wide band HF Choke (5 WDG)"can you explain?thanks Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 10, 2005 Report Share Posted September 10, 2005 I guess the ferrite core is a Philips one with 6 holes for the wire to loop through and has 5 turns of wire in it.Entering Ferroxcube in Google linked to a site by Ferroxcube. They have a few of these cores and the ones with the highest inductance resonate below 100MHz. Here is a good one: Quote Link to comment Share on other sites More sharing options...
walid Posted September 11, 2005 Author Report Share Posted September 11, 2005 Thats what I expect from you Audioguru. it is a good answerthank you very much Quote Link to comment Share on other sites More sharing options...
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