Showing posts with label svet. Show all posts
Showing posts with label svet. Show all posts

Wednesday, September 22, 2021

FM Transmitter BC BF transistors

 https://xtronic.org/circuit/audio/circuit-micro-fm-transmitter-bf494/


Operation of the fm transmiter with bf494

The signs captured by the electret microphone, your voice or close people’s chats, they are mischievous to the base of the transistor Q1 through C1 where are amplified. The resistor R2 together with R3 it determines this amplification.


Wanting a smaller earnings, because the sound tends to be distorted by the excessive earnings, we can reduce to value of R2 and R3.


After having amplified, the sign is removed of the collector of this transistor and mischievous to the base of Q2, where it modulates in frequency the sign generated by this stage. This stage is exactly an oscillator of high frequency that operates in the strip of FM. Your frequency is determined by L1 and for the adjustment of CV.


The obtained signs, already modulated in frequency, they are mischievous to a linked antenna in the collector of the transistor Q2.


The reach of the transmitter will depend a lot on this antenna, of the feeding of the circuit and of the place where will happen your operation. In open field, with a feeding of 6 V (4 piles AA) and an antenna of about 40 cm of length, we can arrive to the 200 meters. With a smaller antenna, or in place with many structures of iron (flagstones) the reach will be sensibly reduced. A common wall without metallic structure is not obstacle for this transmitter.


List material for assembly of the micro fm transmitters with bf494

Semiconductors:


Q1 – BC558

Q2 – BF494

MIC–microphone electret two terminals

Resistors: (1/4 W, 5%)


R1–4,7 KΩ (Yellow, violet, Red, Gold)

R2–220 KΩ (red, red, yellow, Gold)

R3–22 KΩ (red, red, orange, Gold)

R4–10 KΩ (Brown, black, orange, Gold)

R5–6,8 KΩ (Blue, Gray, red, Gold)

R6–47 Ω (Yellow, violet, Black, Gold)

Capacitors:


C1–10 µF/16 V – ELECTROLYTIC

C2–4,7 µF/16 V – ELECTROLYTIC

C3–10 nF – ceramic

C4–4,7 pF – ceramic

C5–100 nF – ceramic

CV–trimmer from 3-30 to 5-50 pF

Miscellaneous:


L1 – to see text

S1–simple Switch

B1 –3 to 6 V – Battery or power supply

ANT –antenna – to see text

Printed circuit board, box for assembly, support for 2 or 4 small Batteries, etc.

Download PDF files – PCB for FM transmitter

https://www.dropbox.com/s/jfjy1mpjb3nymno/tx-fm-xtronic.org.zip?dl=1






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Friday, September 17, 2021

Very good FM transmitter

MICRO EDITOR - the new editor

https://micro-editor.github.io/


 https://www.electroschematics.com/88-108-mhz-fm-transmitter-bf982-bf199-bfr90/


The most important part of this 88-108 transmitter is the Colpitts oscillator. C3,C4,C5,C6,CD1-CD2 ans L1 determine the transmission frequency. The RF Oscillator circuit has the BF982 MosFet transistor wich is the active part. The others 2 transistors separate the VCO from antenna.

The first stage BF199 amplifies the weak signal from the vco and functions in constant load. The second stage BFR90 amplifies the rf signal to load the antenna wich will radiate the radio frequency power.

Antenna can be one wire, 70 cm long. L1 coil has 1mm thick copper wire, 3.5 turns, 5 mm diameter and 1mm space between turns.

You can use BF199 instead of BFR90 and MV104 instead of the 2 varicape diodes.


The ultimate book Pro C# 7 with .NET and .NET Core 8 * edition * Andrew Troelsen & Philip Japikse * Apress * 29 MB * 1410 pages * PDF format, please contact me if you need this an excellent book.


https://www.electroschematics.com/radio-transmitter-circuit/


https://www.catalog.update.microsoft.com/Search.aspx?q=KB4511872
cumulative update for ie11

Insanely good Linux distributions:

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Wednesday, September 15, 2021

FM World

 http://www.zpag.net/Electroniques/English/Radio/fm_3_transistor_circuits.html


https://www.eleccircuit.com/two-transistors-fm-wireless-microphone-circuit/


http://www.circuitdiagram.org/three-stage-fm-transmitter.html


https://www.electronicsforu.com/electronics-projects/simple-fm-transmitter


https://www.homemade-circuits.com/make-this-stereo-fm-transmitter-using/


http://www.circuitdiagram.org/high_power_fm_transmitter.html




http://meutransmissorfm.blogspot.com/2016/05/transmissor-de-fm-com-2n3553-4-watts-de.html?m=1

https://github.com/sandboxie-plus/Sandboxie


https://circuitdiagram.net/4-stage-fm-transmitter.html

This is the FM transmitter circuit which apply 4 radio frequency stages, that are a VHF oscillator designed around transistor BF494 (T1), a preamplifier designed around transistor BF200 (T2), a driver designed around transistor 2N2219 (T3) and also a power amplifier designed around transistor 2N3866 (T4). A condenser microphone is wired at the input of the oscillator.

The Operational of this FM transmitter circuit is very simple. At the time you speak close to the microphone, frequency-modulated signals are produced at the collector of oscillator transistor T1. The FM signals are amplified by the VHF preamplifier and also the pre-driver stage. You’ll be able to also use transistor 2N5109 as a placement of 2N2219.

The preamplifier works as a tuned class-A RF amplifier while the driver works as a class-C amplifier. Signals are finally fed towards the class-C RF power amplifier, which delivers RF power to a 50-ohm horizontal dipole or ground plane antenna.

Regulator IC 78C09 gives you stable 9V supply to the oscillator, so variation in the supply voltage is not going to have an impact on the frequency produced. You are able to also use a 12V battery to power the circuit.

Use a heat-sink with transistor 2N3866 for heat dissipation. Alter the trimmer VC1 connected across L1 to produce frequency within 88-108 MHz with care. Also alter trimmers VC2 through VC7 to obtain maximum output at maximum assortment.

Assemble the circuit on a generalpurpose PCB. Set up the antenna correctly for optimum range. Coils L1 through L5 are built with 20 SWG copper-enamelled wire wound over air-cores that have 8mm diameter. They will have 4, 6, 6, 5 and 7 turns of wire, respectively.

This 4 stage FM transmitter tested by Electronics For You mag and should be work. You can download this circuit in PDF version from the following link:





Read more https://circuitdiagram.net/4-stage-fm-transmitter.html




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Friday, September 10, 2021

Solus must try Linux

 https://getsol.us/home/

srpski svet


https://www.phplift.net/12-reasons-to-choose-php-for-developing-website/


WIDE OPEN SERBIAN WORLD


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Monday, September 6, 2021

Say something to me and the whole world

SERBIAN WORLD

My new website, written 10 minutes from scratch!

http://rad.eu5.org




https://twitter.com/serbianworld?lang=en


Rapid-application development (RAD), also called rapid-application building (RAB), is both a general term for adaptive software development approaches, and the name for James Martin's method of rapid development. In general, RAD approaches to software development put less emphasis on planning and more emphasis on an adaptive process. Prototypes are often used in addition to or sometimes even instead of design specifications.

RAD is especially well suited for (although not limited to) developing software that is driven by user interface requirements. Graphical user interface builders are often called rapid application development tools. Other approaches to rapid development include the adaptive, agile, spiral, and unified models.

More tips:

https://www.howtogeek.com/747842/how-to-use-a-whiteboard-in-a-microsoft-teams-meeting/

Insert more jpgs to LazReport:





  1. procedure TForm1.frReport1EnterRect(Memo: TStringList; View: TfrView);
  2. var
  3.   FileName: String;
  4. begin
  5.   if (View is TfrPictureView) then
  6.   begin
  7.     if (View as TfrPictureView).Name = 'imMyImage' then //change imMyImage
  8.     begin
  9.       FileName := SQLQuery1.FieldByName('PATH_OF_IMAGE').AsString); //change SQLQuery1
  10.       (View as TfrPictureView).Visible := FileExists(FileName);
  11.       if (View as TfrPictureView).Visible then
  12.         (View as TfrPictureView).Picture.LoadFromFile(FileName);
  13.     end;
  14.   end;
  15. end;


for i := 1 to 36 do begin
   sgEL.Row := i;
   frReport1.LoadFromFile(gsReportPath+myReport.lrf');
   frReport1.PrepareReport;  {from Rows[i]}
   frCompositeReport1.Reports.add(frReport1);
end;
frCompositeReport1.ShowReport;

//---

var
  r: TfrReport;
for i := 1 to 36 do begin
   sgEL.Row := i;
   r:=TfrReport.create(self);
   r.loadFromFile(gsReportPath+'myReport.lrf'); // here myReport.lrf must be the report corresponding to Row "i"
   frCompositeReport1.Reports.add(r);
end;
frCompositeReport1.ShowReport;

//---

type
TForm1 = class(TForm)     
 Filas: TfrUserDataset;   
 frCompositeReport1: TfrCompositeReport;       
 [...]
 procedure TheReportEnterRect(Memo: TStringList; View: TfrView);
 procedure TheReportGetValue(const ParName: String; var ParValue: Variant);
 [...]
end;

procedure TForm1.Button12Click(Sender: TObject);
var
i : integer;
begin

  with frCompositeReport1 do begin
    DoublePass:= True;
    Reports.Clear;
  end;
  for i := 1 to 36 do begin
   sgEL.Row := i;
   TheReport :=TfrReport.Create(self);
   TheRepor.OnEnterRect:= @TheReportEnterRect;
   TheReport.OnGetValue:= @TheReportGetValue;
   TheReport.Dataset := Filas;
   TheReport.loadFromFile(gsReportPath+'myReport.lrf');
   //TheReport.PrepareReport;
   //TheReport.ShowReport; {The 36 pages are OK}
   frCompositeReport1.Reports.add(TheReport);
end;
frCompositeReport1.ShowReport;


//---

var  TheReport : array [1..100] of TfrReport;
begin
for i := 1 to 36 do begin
   sgEL.Row := i;
   TheReport[i]:=TfrReport.Create(self);
   TheReport[i].OnEnterRect:= @TheReportEnterRect;
   TheReport[i].OnGetValue:= @TheReportGetValue;
   TheReport[i].Dataset := Filas;
   TheReport[i].loadFromFile(gsReportPath+'myReport.lrf');
 //  TheReport[i].PrepareReport;
 //  TheReport[i].ShowReport;         {It's OK}
   frCompositeReport1.Reports.add(TheReport[i]);
   TheReport[i].Free;
end;
frCompositeReport1.ShowReport;


Even more stuff to go:









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Monday, October 17, 2016

HP Laserjet 1010 štampač na windows 7






Kako instalirati HP Laserjet 1010 štampač na windows 7


1. Preuzmite i instalirajte PCL 5 universal printer driver sa sajtawww.hp.com za windows 7
2. U printer properties,odaberite port: DOT4_001

http://www.webkuhinja.com/2011/05/kako-instalirati-hp-lasejet-1010-stampac-na-windows-7/comment-page-1/

 http://www.wikihow.com/Connect-HP-LaserJet-1010-to-Windows-7


How To Install HP LaserJet 1010 Printer on Windows 7

HP LaserJet 1010 printer is a monochrome laser printer that handles printouts at up to 12 pages per minute for A4 sizes papers. It also delivers its first page out for 8 seconds and has 600 x 600 dpi printing resolution. It has a 150 sheet paper tray capacity and has a priority feed slot. If you happen to own an HP LaserJet 1010 but your desktop happens to have a Windows 7 operating system, then you might find yourself having a hard time installing your HP LaserJet1010 printer on it.
That’s why for today’s article, we’re going to teach you on how to install the HP LaserJet 1010 printer on your Windows 7 computer.
How To Install HP LaserJet 1010 Printer on Windows 7
  • Step 1 – Open the the windows taskbar, hover and click the Control Panel.
  • Step 2 – Go to Hardware and Sound then proceed to Devices and Printers.
  • Step 3 – Click add a printer then a window will pop out of your screen. Select and clickadd a local printer.
  • Step 4 – From the list next to the “Use an existing port” then select “DOT4_001 (Generic IEEE….)” then click next.
  • Step 5 – Then click Windows Update.
  • Step 6 – The windows will then show “Install the Printer Driver”, select HP from theManufacturer list and “HP Jaserjet 3055 PCL5” then next.
  • Step 7 – The printer’s name will automatically appear HP LaserJet 3055 PCL5, change this to HP LaserJet 1010 laser printer then select next.
  • Step 8 – The printer’s driver will then install.
  • Step 9 – Once done, select whether you will share the printer over the network or not.
  • Step 10 – Then it’s finished, check set as the default printer then click finish.

Na Linuxu je mnogo jednostavnije jer imate HPLIP-GUI:

Samo instalirate Linux, na primer predivni Linux Lite, zatim u Synaptic package manager-u otkucate HPLIP i nebo je granica, svi HP linux printeri rade super sa ovim univerzalnim drajverom za HP printere pod svim Linux-ima.
Da li ste znali da HPLIP-GUI ima i drajvere za većinu HP skenera ?
Znači na Windows-u svaki HP printer ima svoj drajver, a kod Linux-a jedan drajver pokriva gomilu HP printera, odnosno, prilagodjava se svakom od njih.
Da li ste znali da je HPLIP kodiran u Python programskom jeziku ?
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