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2 Mar 2014

dx-com-bluetooth-module-hc-06

mcuoneclipse.com explains how to use the HC-06 Bluetooth Module. They write:

After my first post using a Bluetooth module, things have evolved a bit. The challenge with these Bluetooth modules is: they look the same, but having different firmware. I did not fully realize that until I have ordered another bluetooth module from dx.com: That module comes already on a carrier, so I assumed I can use the same driver as for my other module. I was wrong :-(.

HC-05 or HC-06

My earlier module which I received from another source (without an adapter, see this post) has a different firmware on it, known as HC-05, while my DX.com module has a HC-06 firmware. To be clear: the modules are the same, but the software/firmware on it is different, and the firmware uses the pins differently too

Using the HC-06 Bluetooth Module - [Link]

23 Jan 2014

obr1472_1

Admittance control, movement of goods, tickets for various cultural events and sport matches, travel tickets, parking,… thanks to a permanently lower price and bigger possibilities of RFID cards (tags) the Mifare system (13,56 Mhz) in various variations runs forward even to segment where an older 125 kHz system didn´t suite. Complete RFID solution for a very affordable price, it is a short summary of RFID modules features from company Stronglink, which we already introduced to you in several articles.

Group of modules SL03x – SL030, SL031 and SL032 represents complete OEM RFID modules with antenna integrated on a PCB, intended to be built into an end device. All these three modules support Mifare Mini, Mifare 1k, Mifare 4k, Mifare Plus and Mifare Ultralight. SL032 further supports also the DESFire protocol. SL030 has an I2C communication interface, while the SL031 and SL032 have a UART. Modules are controlled by a set of simple commands, thus an integration into a device should cause no troubles even to less-experienced developers.

Closer information will provide you the SL030, SL031 and SL032 user manuals, as well as AN100721, AN101203 and AN110221 application notes.

Thanks to a close cooperation with a producer, we aim to keep a sufficient amount of STRONGLINK RFID modules in stock.

SL030, 031, 032 … Mifare RFID available for you - [Link]

18 Jan 2014

Ever wondered how they transmit your TV signal?

David Kilpatrick from TXAustralia takes us on a detailed tour of the old decommissioned 10kW analog TV transmission system at the Artarmon facility in Sydney. It is still used to transmit digital TV. How it all works from the broadcaster video input to final transmission output up the 180m broadcast antenna. Plus some teardowns of the old equipment that’s been used to transmit the Channel 7 TV signal in Sydney since 1981.
Copper rigid coaxial lines, waveguides, filters, splitters, combiners, converters, transmission valve, power supplies and all the equipment necessary to transmit a 10kW analog or digital TV signal in a major city like Sydney.

EEVblog #569 – Tour of an Analog TV Transmission Facility - [Link]

29 Dec 2013

3D_PCB

This project is car hands free that retransmits the audio signal from a cell phone to the FM broadcast band. By placing the cell phone’s speaker near the microphone, the user can use the phone as a hands-free device while driving.

MAX2606 – Hands-Free Car Kit for Cell Phones - [Link]


6 Dec 2013

Application:

A small, simple AM receiver project.  This AM receiver can pick up medium wave stations in your area

Description:

This circuit can use general purpose transistors, and in this example there are 3 BC109C transistors.  In this schematic and BOM there is a 200uH inductor and a trimmer 150-500pF capacitor, though these parts can be salvaged from an old AM radio, to preserve the directional nature of a tuning coil, and an adjustment knob (plate capacitor) that work well for radio reception.

The 120k resistor is for regenerative feedback between the Q2 NPN transistor and the input to the tank circuit.  The value of this resistor is important to the performance of the entire circuit.  In fact, it may be better to replace the fixed value with a variable resistor paired with a fixed resistor to adjust the oscillation and sensitivity of the circuit.  All the connections in this circuit should be short to minimize interference.

Performance of the circuit will vary depending on stray capacitance in your layout, the inductor winding/core/length, etc.  Changing values of some of the capacitors, or adding them, as well as a potentiometer in the feedback loop can help with the performance of the receiver.  With such a small circuit that is affected so much by its construction and its environment, a lot of hand tuning and experimentation will be fun, instructive, and possibly necessary to make it work best.

Simple AM Receiver Project - [Link]

21 Nov 2013

3D_PCB_th

This is a VCO FM Transmitter with range 500m – 4km depending on antenna used

- Power supply: 12-14 V stab., 100 mA
- RF power: 400 mW
- Impedance: 50-75 ohm
- Frequency range: 87,5-108 MHz
- Modulation: wideband FM

FM VCO Transmitter - [Link]

13 Nov 2013

article-2013october-understanding-the-basics-of-low-noise-fig3

By Bill Schweber:

In a wireless design, two components are the critical interfaces between the antenna and the electronic circuits, the low-noise amplifier (LNA) and the power amplifier (PA). However, that is where their commonality ends. Although both have very simple functional block diagrams and roles in principle, they have very different challenges, priorities, and performance parameters.

How so? The LNA functions in a world of unknowns. As the “front end” of the receiver channel, it must capture and amplify a very-low-power, low-voltage signal plus associated random noise which the antenna presents to it, within the bandwidth of interest. In signal theory, this is called the unknown signal/unknown noise challenge, the most difficult of all signal-processing challenges.

Understanding the Basics of Low-Noise and Power Amplifiers in Wireless Designs - [Link]

8 Nov 2013

PCB_Layout

This is a small circuit with two maxim’s ic, MAX4467 as microphone amplifier and MAX406 as VCO FM transmitter. It’s suitable for short range FM transmittion aka wireless FM microphone.

Here is a very simple, inexpensive and interesting project which provides lot of fun to a home experimenter or hobbyist. This simple transmitter can transmit speech over a short range. It can be used as a simple cordless microphone. The circuit uses two integrated circuits from Maxim. IC1 a MAX4467, is an amplifier raising the microphone signal to a level suitable for frequency modulation (FM). IC2 is a voltage-controlled oscillator (VCO) with integrated varactor (a.k.a. varicap diode).

FM Transmitter MAX4467 & MAX2606 - [Link]

9 Sep 2013

obr1381_uvod

SL030 module communicates through favorite I2C interface and supports a wide scale of secure RFID technologies on the frequency of 13.56 MHz. 

RFID modules Stronglink provide an excellent quality for an unbeatable price, that´s why from now you can find in our store another member of readers/ writers SL0xx module SL030. In many ways is the SL030 similar to other readers of the SL0xx family (especially SL031), which were introduced to you in the article „Stronglink modules will provide you a highly secure RFID”.

SL 030 supports the most of known RFID protocols on the frequency of 13.56 MHz like MIFARE 1k, MIFARE 4k, MIFARE Ultralight as well as NFC NTAG203. Built-in antenna and automatic detection of tags significantly simplify usage of the module. Also positive is the fact, that despite a 3V power supply, the outputs are 5V tolerant, thus combination with a 5V logic should be trouble free. SL030 contain besides an I2C communication interface also a direct output (OUT pin) indicating presence of RFID tag in a reach.   SL030 can be set up to 4 different I2C addresses (1010000-1010011) by means jumpers JP1 and JP2. The communication itself runs in a standard form usual for an I2C bus. Commands (from a  Host microcontroller of your application) are sent in a form of „Start+Address+Data_Length+Command+Data+Stop“. Overview of available commands is displayed in a Table no. 3. Result of operation is sent back from SL030 through I2C in a form of Command+Status+Data. Byte „Status“ indicates result of operation (Success/Fail,…) – table no. 4. Overview of possible statuses is summarized in section 4-3.

Detailed information will provide you the SL030 datasheet and examples of source codes ARM, AVR, MCS51, MSP430 a PIC.
Upon request we´re able to provide you any other Stronglink type within few days. In case of interest please contact us at info@soselectronic.com.

SL030 recognizes Mifare and NFC too – [Link]

20 Aug 2013

article-2013aug-selecting-rf-connector-wireless-system-fig2

By Bill Schweber

The explosive growth of “wireless” systems has led to a simultaneous expansion in the use of RF connectors and their associated cables. These assemblies are increasingly vital links between multiple circuit boards, between antennas and front ends, and between power amplifiers (PAs) and antennas. They are instrumental to the operation of such wireless devices and systems as cellular telephones, wireless data networks and advanced radar and electronic-warfare (EW) systems.

Connectors for RF systems have the simple yet critical task of transferring signals from one location to another, with little or no change to the signal (although in reality even with high quality RF cable between the antenna connector and the antenna engineers often factor in a 0.2 dB loss per coaxial connector in addition to the cable attenuation itself).

Selecting an RF Connector for your Wireless System - [Link]



 
 
 

 

 

 

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