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Category: Electronic UpDownloads in English
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 Wave Frequency Doubler | | Description: | A quasi-planar frequency doubler based on the. junction of a coplanar waveguide and a finline us-. ing two silicon Schottky diodes mounted across this | | | Filesize: | 0 Bytes | | Added on: | 13-Dec-2003 | | Downloads: | 338 | | Category: | Electronic UpDownloads in English | | Details |
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| Unusual Frequency Dividers | | Description: | The following circuit uses a 75140 line receiver to form an injection locked oscillator. The circuit is similar to the common op-amp square-wave oscillator with values selected
to keep the voltages within the recommended operating ranges. The frequency to be divided is coupled through a 5k resistor to the positive feedback input of the comparator
superimposing a 0.5 volt squarewave. The small squarewave toggles the comparator when the sawtooth voltage on the capacitor comes close to the DC level on the positive
feedback input. The result is that the comparator output frequency is an integer submultiple
of the input frequency. Since the comparators exhibit good temperature stability
and precision, the division ratio can be quite high. A division factor over 20 is practical
and since the 75140 is a dual line receiver, two dividers may be cascaded for division
ratios over 400. For ratios higher than 4, increase the 5k series resistor to 10k. | | | Filesize: | 300 Bytes | | Added on: | 22-Jan-2010 | | Downloads: | 288 | | Category: | Electronic UpDownloads in English | | Details |
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| StampWorks Manual | | Description: | StampWorks Manual | | | Filesize: | 0 Bytes | | Added on: | 15-Feb-2005 | | Downloads: | 321 | | Category: | Electronic UpDownloads in English | | Details |
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| SSB/CW Transceiver for 14 MHz | | Description: | A QRP SSB/CW Transceiver for. 14 MHz. Part 2t: This month, W7Z0I ... The 20- meter phone band, however, can. be a little intimidating for the QRP enthusiast. | | | Filesize: | 0 Bytes | | Added on: | 21-Dec-2008 | | Downloads: | 266 | | Category: | Electronic UpDownloads in English | | Details |
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| RGB to NTSC/PAL Encoder | | Description: | FEATURES
Low Cost, Integrated Solution
+5 V Operation
Accepts FSC Clock or Crystal, or 4FSC Clock
Composite Video and Separate Y/C (S-Video) Outputs
Minimal External Components:
No External Filters or Delay Lines Required
Onboard DC Restoration
Accepts Either HSYNC & VSYNC or CSYNC
Phase Lock to External Subcarrier
Drives 75 W Reverse-Terminated Loads
Logic Selectable NTSC or PAL Encoding Modes
Compact 16-Pin SOIC
APPLICATIONS
RGB to NTSC or PAL Encoding | | | Filesize: | 0 Bytes | | Added on: | 19-Feb-2006 | | Downloads: | 336 | | Category: | Electronic UpDownloads in English | | Details |
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| Remote Synthesised VFO | | Description: | A Remote Synthesised VFO for the HW9 by Stewart Rolfe / GWØETF
This project provided an opportunity to put to good use a long held interest in Programmable Interface Controllers (PICs) and an urge to play with the new Direct Digital Synthesiser chips which had just started appearing in the amateur radio press in such articles as G3XJP’s excellent Pic’n Mix in RadCom1. The
following describes an exercise in self education first and foremost, but one which has been applied in practice to cure some basic problems in an otherwise fine QRP transceiver. Though aimed at one specific radio it is hoped that the description will be of more general interest and could be easily adapted to other
situations. Most of the technical content is a compilation of previously published ideas and articles with a
small amount of original material mainly connected with the need to adapt to the specific case of the HW9.
All material used is fully acknowledged, and reference to the original sources will provide a fuller description
of what is included here. | | | Filesize: | 300 Bytes | | Added on: | 09-Jan-2010 | | Downloads: | 405 | | Category: | Electronic UpDownloads in English | | Details |
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| PULSED LED TESTER | | Description: | DAVID JOHNSON AND ASSOCIATES
PULSED LED TESTER | | | Filesize: | 300 Bytes | | Added on: | 04-Jan-2010 | | Downloads: | 255 | | Category: | Electronic UpDownloads in English | | Details |
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| PIC16F84 based CW Decoder | | Description: | The project in few words I propose a simple CW decoder wich makes use of a PIC16F84 microprocessor with a 16x2 chars LCD display. It is equipped with an audio frequency input from your receiver, an input for a stright key and an audio output locked to the input signal. It automatically
adapts itself to the CW rate and may be employed for learning purpose substituting the traditional tone generator and offering the capability of displaying the keyed code.
| | | Filesize: | 0 Bytes | | Added on: | 21-Dec-2008 | | Downloads: | 299 | | Category: | Electronic UpDownloads in English | | Details |
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| PIC Programmer and Test-Demonstration Board | | Description: | 1 Introduction
2 Hardware Description.
2.1 PIC programmer
2.2 Project/Demonstration
2.2.1 PIC system clock (crystal).
2.2.2 LEDs
2.2.3 Pushbuttons
2.2.4 LCD.
2.2.5 Rotary Encoder
2.2.6 Speaker .
2.2.7 Signal generation with the NJQRP DDS Daughtercard
2.2.8 Signal Conditioner
2.2.9 CW paddle Input via a Stereo Jack
2.2.10 Transmitter Keying via a Stereo Jack.
2.2.11 Frequency Counter
2.2.12 How to Drive a Relay from a PIC
3 PIC-EL Assembly
3.1 Parts Identification
3.2 Test Points
3.3 Assembly
3.4 Final installation and Basic PIC-EL Test
4 PIC-EL Computer Interface
4.1.1 Installing FPP
4.1.2 Installing FPPA
4.1.3 Using FPP / FPPA
5 PIC-EL Diagnostic Program
5.1 Test LEDs
5.2 Test Pushbuttons
5.3 Test Speaker
5.4 Test Encoder
5.5 Test Paddles
5.6 Test Transmitter Keying
5.7 Test DDS-30
5.8 Test DDS-60
6 Elmer-160 Lessons | | | Filesize: | 900 Bytes | | Added on: | 09-Jan-2010 | | Downloads: | 385 | | Category: | Electronic UpDownloads in English | | Details |
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| PBASIC 2.5 Syntax Enhancement Notes | | Description: | PBASIC 2.5 Syntax Enhancement Notes Provides overview of what''s new with the PBASIC language in the BASIC Stamp Windows Editor v2.0 and higher | | | Filesize: | 0 Bytes | | Added on: | 15-Feb-2005 | | Downloads: | 238 | | Category: | Electronic UpDownloads in English | | Details |
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