Simple electronic projects for beginners in electronics engineering gas problem in babies

Therefore, we recommend beginners to start these projects as these are capable of working for them on their first attempt itself. Before proceeding with these projects the beginners should know how to use a breadboard and basic Components used in Electronics. Electronic Projects for Beginners 1. FM Transmitter

When the audio from portable audio devices like iPod, phone, mp3 player, CD player is connected to the FM Transmitter, then the sound from the audio device is broadcasted through the transmitter as an FM station. This is then picked up on your car radio or other FM receivers when the tuner is tuned to transmitted FM band or frequency.

This is the first stage wherein the converter converts the external audio source output to frequency signals. In the second stage the modulation of the audio signal takes place by using FM Modulation circuit. This FM modulated signal is then laid on to a Radio frequency transmitter. So, by tuning the FM receiver or local FM devices one can hear the audio that is actually sent by the transmitter.

This circuit is used to transmit noise-free FM signal up to 100meters by using one transistor. The transmitted message from the FM transmitter is then received by the FM receiver passing through three stages: oscillator, modulator, and amplifier stages.

By adjusting voltage controlled oscillator: VC1, the transmitting frequency of 88-108MHZ is generated. The input voice given to the microphone is changed into an electric signal and is then given to base of the transistor T1. The oscillated frequency depends upon the values of R2, C2, L2, and L3. The transmitted signal from the FM transmitter is received and tuned by the FM receiver. 2. RAIN ALARM

This circuit alerts the user when it’s going to rain. This is helpful for the home maids to protect their washed cloths and other material and things that are vulnerable to rain when they remain inside the home most of the time for their work.

The rain alarm begins to work and becomes operational when rain water comes in contact with the probe, and once this happens; there is a flow of current through it, which enables the transistor Q1 that is NPN transistor. Conduction of the Q1 makes Q2 become active which is a PNP transistor.

Subsequently the Q2 transistor conducts and the current flows through the speaker and the speaker alarms. Until the probe is in contact with the water, this process repeats again and again. In this system, the oscillation circuit changes the vibration frequency, and thus changes the tone.

In this system, a 555 timer is used as an oscillator that is capable of generating pulses at a maximum of 10 minutes time interval. The frequency of this time interval can be adjusted by using the variable resistor connected between the discharge pin 7 and the Vcc pin 8 of the timer IC. The other resistor value is set at 1K, and the capacitor between the pin 6 and pin 1 is set at 1uF. Flashing Lamps Using 555 Timer

The output of the timer at pin 3 is given to the parallel combination of a diode and the relay. The system uses a normally closed contact relay. The system uses 4 lamps: two of which are connected in series, and the other two pair of series lamps are connected in parallel to each other. A DPST switch is used to control the switching of each pair of lamps.

The common contact of the DPST switch is connected in such a way that the upper pair of lamps receives the supply of 230 V AC. As the switching operation of the relay varies due to oscillations, the intensity of the lamps also varies and they appear flashing. The same operation occurs for the other pair of lamps as well.

These are the three basic electronic projects for beginners to make them to learn about the components’ working and the way of implementing the projects. If you have any doubts regarding these projects or any other information regarding latest projects and their implementation, you can comment in the comments section given below.