Panel switch wiring

Showing posts with label radio. Show all posts

Friday, October 3, 2014

FM Radio Using TDA7000

Here’s a design simple circuit using TDA7000 that can build an FM radio with a minimum of components; most of them so easy to manage, like the ceramic capacitors that do not require polarization and only two resistors. Here’s the figure of the circuit;

The components you will employ will be of small dimensions and low cost. Even the integrated circuit itself, the TDA 7000, is not of great cost.

Monday, September 8, 2014

Dipole Antenna for FM Radio

This is dipole antenna.when you build this you should get the same length.If not you will not be able to get the maximum harvest.Use 60-75 ohm coxial cable.

Note

# when you use insulators becareful.Because if they grounded you cant get goot result

Saturday, August 23, 2014

Easy to Use FM Radio Receiver

The project is a user-friendly and cheap FM radio receiver which produces the desired audio signals using integrated schema to achieve the pre-processing units. During operation, the user is allowed to change stations and interact with the receiver by integrating a keypad and an LCD for communication. There are several functions that this radio receiver can perform including adjusting the threshold when picking up stronger or weaker stations, setting up 3 favorite stations for quick tuning, scanning up/down for next strong signal station, and tuning up/down a frequency.

A keypad is designed for controlling the receiver and the buttons are mapped to their corresponding functionality while the other buttons are not connected. The 4 main sub-components of the receiver include the LCD, the keypad, the favorite station storage, and the communication with receiver. Each of them is being controlled by their software components. The antenna transfers the incoming radio signal to the AR1010 FM radio receiver. To communicate with the AR1010, the I2C protocol is used since the sample code is available online. Also, the AR1010 is powered by 3V. The button presses on the keypad are scanned by the program.

Friday, August 15, 2014

Single transistor radio

Here is the schema diagram of a simple radio that uses one transistor and few other passive components.The C6 and L1 forms a tank schema which picks up the signal from your desired radio station.Diode D1, capacitor C2 and resistor R1 does the detection of the picked signal.The detected signal is coupled to the base of Q1 through capacitor C3.The Q1 gives required amplification to the signal.The resistor R2 is used to bias Q1.R3 limits the collector current of Q1.The audio output will be available at the collector of Q1 and it can be heard by using a high impedance head phone.This radio will work only at places where there is reasonable radio signal strength.

Notes.

* Assemble the schema on a general purpose PCB.
* The schema can be powered from a 3V battery.
* The antenna can be a 1 M long wire.
* The headphone must be a high impedance(2 to 3K) type.
* If diode AA121 is not available you can use AA112, AA116 or 1N34.
* The inductor L1 must be a 0.35mH, center tapped one.
* The radio can be tuned by adjusting the variable capacitor C6.