MNA

yeah it is...but the previous one uses 555.....and I didn't get any other crkt....apart from parts what else r your views about the crkt....Actually,I know it will be a lot easier to use Bh1417 ic....but I m trying to get it in the other way....ok not using ic will not produce good results,but I think atleast something will be produced at the end????? It will help in understandings much....

Veronica doesn't hav pre -emphasis.....Why?? Is this not going to do any harm? Audio,I've seen that project and read your views on that...no doubt it is good...but I want to understand why Veronica is not good....

Well Audio, I was reading some articles to understand the functioning.... "Oscillator Types: 1. VFO (Variable Frequency Oscillator) - An oscillator whose output frequency can be changed by adjusting a variable inductor or variable capacitor. 2. VCO (Voltage Controlled Oscillator) - An oscillator whose output frequency is controlled or changed by an application of external voltage. VCO uses varicap diode that changes the capacitance as different levels of voltage are applied. 3. PLL (Phase Locked Loop) - A circuit that synchronizes a frequency of VCO with a frequency of a reference oscillator by using a comparison of phase between the two signals. PLL takes a frequency of VCO, divides it into a lower frequency which can be compared with a stable reference oscillator. Then amplifiers are used to send an appropriate voltage back to the VCO to keep the desired frequency stable. 4. Crystal Oscillator - Oscillator that uses a crystal to generate a frequency." 1.Which one is preferred in which conditions.......(i.e. voice fm tx,stereo fm tx....)? 2. If I'm right the transmitter crkt is based on VCO....and u r saying it should be crystal oscillator??? Is this crkt going to give me nothing or is it worth trying? 3. as far as stereo encoder is concerned,the second one looks to me better,as it is using crystal...what do u say ? 4. Can I transmit voice with a stereo transmitter???...by grounding L???? I started this topic without any knowledge about transmitters...but it seems to me that I'm getting some.Thanx for you helping.

Hi Audio, I found the Stereo coder at the bottom....I've attached it... STEREO_schema.zip

Hi,Ante that link worked or not?? I've attached the crkt. Veronica_schematics.zip Veronica_construction.zip

I was searching about the stereo encoders and got this ....Well it uses the crystal.....About RF section,I'm absolutely not clear about what u r pointing at.......It is giving MPX output ,Is it going to be connected to the previous fm transmitter crkt or something else would have to be done?.......thanx. I was unable to attach the crkt.. http://renaud.cerrato.free.fr/download.html I'm talking about the stereocoder on this link at the bottom... I'm sorry for the inconvenience but i can't attach it and u know the reason...

It seems to me an out of place question...I downloaded many e-books from resource forum ...those were .rar files.....and when I executed them ....I got the message "Unexpected end of archive".....Anyone know about that???

Many members here r trying to get access to this article.So, I thought of posting the link. http://electronics-diy.com/schematics/BH1417_fm_transmitter.htm

I searched for PLL fm trans ....But found PIC's in all....Is there any other way out?I don't know about PICs.

Sir,I m confused....1) U r talking about RF section..do u mean FM transmitter section or any section in the stereo encoder?.....2) I think that 555 timer can be replaced without any difficulty,am I right?...3) I don't have BH1417 datasheet with it's internal diagram....

Audio,I'm really not getting what is going on.....where's the problem??....Is this due to 555......Is there something to be done with PLL???......what to do and what not.....Explain me plz :-\

thanx Audio..I am going through the article...it's good. you said The BH1415's RF frequency drifts all over the place ...What does this mean??

Hi Ante, I don't know what's the problem...I tried to attach it....but got the message that the upload folder is full....???????

As far as the datasheet is concerned, I have found it....

Hi audio, I think before moving on ....I should see the datasheet of BH1415.....I tried on google but surprisingly didn't get to one....If u have found it's datasheet plz supply me the link.... Silicon Micromitter IC is surface mount :(.... I know using IC will make it easy,but I think that not using IC will help in understanding many concepts.....as you know I am new to the subject....Anyway, I would like to see the BH1415 dataheet.... thanx

Hi awright, below is the link where u can find the veronica 1 watt PLL FM transmitter....Sorry for not supplying it before...but I thought u can find it by the schematic link.... http://gbppr.trighost.org/lpfm/index.html I heard Sasi talking about this crkt without PLL section http://www.electronics-lab.com/forum/index.php?topic=4034.0 ....That's why I asked what i have to do to remove it....and also I don't understand why the crkt is so complicated...Is this because of PLL??? Why am I trying to remove it? well the answer is I'm not...actually I was just trying to discover that if the crkt complication is due to the PLL section?...can you tell me something about the crkt or it's block diagram...I'm relatively new to the subject.. Thanx

http://home.telkomsa.net/jeanward/fm_stereo.htm can this stereo encoder be connected to audioguru fm tx?..... Why?..what's the theory?...

what is PLL???...what have to be done to make the circuit without PLL???...