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There are two kinds of PDF watermarks : text watermark and image watermark . Text watermark is generally used in commercial field to show the background ... The 10 MHz WWV Receiver is shown in the block diagram of Figure 10-3 and in the main schematic diagram in Figure 10-4 The WWV Time Code receiver is an AM TRF or Tuned Radio Frequency or TRF type receiver This receiver project is designed specifically for 10 MHz time signal operation The block diagram of the WWV receiver illustrates the four major sections of the receiver The receiver s front-end, as shown in the schematic diagram, features two sensitive dual-gate MOSFETs in the front-end circuit with a single-pole filter An RF gain control is shown at VR1 which adjusts the input sensitivity, via a 10k ohm potentiometer Note inductor L1 is 41 H coil, which consists of 27 turns of 22 ga AWG wire wound on a add watermark to pdf using itextsharp c#: How to add watermark to pdf document ( c# sample) - Apitron add watermark to pdf using itextsharp c# Watermark pdf in C# - asp.net tips and tricks
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See the C# code snippet below that shows how to add image watermark : ... This type of watermark assumes basic knowledge of PDF drawing system. Using this ... T-68 ferrite core Inductors L2 and L4 consist of 12 turns of 22 ga AWG wire on an FT37-43 ferrite core, and finally L3 consists of 25 turns of #26 ga AWG wire on a T50-2 ferrite core For even greater selectivity (but greater insertion loss), you can consider moving the L1 tap to 1 turn from ground Fine tuning the WWV receiver is accomplished by adjusting CV1 and CV2 trimmer capacitors The front-end MOSFETs are extremely sensitive to static electricity, so be very careful in handling them Note the two ferrite beads, one is placed in series with the Drain lead of Q1, while the second ferrite bead is in series with the Drain of Q2 These ferrite beads are important, so be sure to use them The receiver front-end, at J1, should be connected to a dipole antenna cut for 10 MHz TRF receivers are especially sensitive and are subject to overloading a BCB or Broadcast Band Interference, so internal lead lengths should be kept short between components and the front-end should be shielded and the receiver placed in a metal enclosure for best results The output impedance of Q2 is 2000 ohms, which nicely matches the input impedance of the Cohn crystal filter, in the crystal filter section of the receiver This filter utilizes three 10 MHz crystals Choose 10 MHz crystals that are marked for a 20 pF or 32 pF load capacitance if possible Using a 10 MHz crystal oscillator, find three that are closest to one another in frequency You may substitute 22k ohm resistors instead of the specified 2k with a slight penalty in pass band shape The crystal filter section utilizes a single dual-gate MOSFET transistor at Q3 Coil L5 is 12 turns on an FT37-43 ferrite core The output of the Cohn crystal filter is next fed to the input of the AM detector stage. add watermark to pdf using itextsharp c# Create a WaterMark in PDF files in C# - Code - MSDN - Microsoft
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8 Jun 2018 ... NET PDF Watermarker sample code project. Developers can add watermark to PDF in C# . For text signature, the text font name, font size, font ... The AM detector has three distinct advantages; it has high bandwidth, low distortion and incredible (and variable) sensitivity The variable bias control allows the listener to adjust the bias to maintain detected audio fidelity even when the RF signal is weak The detector uses a Schottky UHF mixer diode at D1 Increasing the diode bias from zero volts to maximum causes three things to happen: increased sensitivity, increased audio high frequency response, and a slight increase in receiver noise The AM detector section matches the 2000 ohm impedance of the crystal filter stage quite nicely A sensitivity control at VR2 is a 1 megohm potentiometer, which feeds directly to L6, a 1000 H coil Coil L6 is connected directly to a Schottky diode at D1 The resultant signal is next sent through a 56k ohm resistor and on to a 1 F capacitor which feeds the nJFET at Q4 The Source lead of Q1 is connected to the Drain lead of Q5, and the Source lead of Q5 is connected to ground via a 56k ohm resistor Note the two 22 F electrolytic capacitors on each of the Drain leads of the nJFETs When the WWV RF signal is weak, turning the bias off may result in the detected WWV signal disappearing Increasing the bias will bring the WWV signal back in You run the bias control pot about half way and, of course, higher as WWV fades out The fidelity that the bias adds even when the WWV signal is strong is quite pleasing to the ear For the 1 F and 22 F capacitors, I used polyester film types which sounded better than electrolytic capacitors The audio amplifier section features low noise audio amplifier Distortion is very low as long as the input is 10 LSP parameters per 240 samples (short-term speech information) add watermark text to pdf using itextsharp c# C# Visual Studio .NET Tutorial - iText# PDF Create Watermark #1
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