Electronic projects

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Electronic projects

FM Transmitters Powerful microtransmitter that can cover 3km range. In our case the output power is about mW depending on the input power of 10mW and 9V battery power supply. The transistor Q1 must be mounted with a heatsink, the heatsink must have small dimensions cylindrical in order not to increase the parasitic capacitance.

Electronic projects

The trimmer R2 serves to adjust the bias of the transistor, start with the trimmer fully open and close by measuring the current absorbed by the 9V, in my case you get mW at the output with a current of 50mA Electronic projects increase this value as you only increase the absorption by heating the transistor without increasing output power, because the input power is too low.

Clearly the 9V battery will be able to provide 50mA only for a few hours, if necessary have greater autonomy should be used a larger battery, but it is no longer a bug but simply an FM transmitter.

FM Transmitters This tiny Mhz FM transmitter bug measures just 10mm x 17mm in size and as you can see in the photos the biggest components are just the microphone and the battery.

Introduction

You can use a small microphone from an older cell phones, they are small in size and have an excellent sensitivity. For an effective power supply the 9V battery Duracell is excellent and allows several hours of battery life, but if you want to have a smaller size it is better to use 2 or 3 lithium cells like the used in PCs.

The circuit works well from 3 to 12V, the maximum range is obtained with 12V and a piece of cm cable as an antenna. It started with a self-build kit from the Danish manufacturer Jostykit that allowed everyone to build a small FM transmitter for a few Euros.

Such transmitters generally consist of a single transistor oscillator with a simple resonance circuit, sometimes with an extra transistor that is used as audio pre-amplifier. The image shows a few examples that were available in European electronics shops in the mid s.

The transmitter shown here was built in the mids and measures just 1 x 2 cm. When properly built, it may have a range of several kilometers.

You may use it to run your own private neighborhood radio, just replacing the microphone capsule with a male audio jack connected to your pc or MP3 player.

You may also use this as a spy transmitter, but be reasonable in that case. It's rated for 1 Watt, so you can listen to it even from a few kilometers, with a good antenna and not too much obstacles in the way.In the mid s large numbers of small FM transmitters, operating in the FM radio broadcast band ( MHz) appeared on the market.

It started with a self-build kit from the Danish manufacturer Jostykit that allowed everyone to build a small FM transmitter for a few Euros. These are for the SC, without CI from Snap Circuits Jr. all the way to Snap Circuits Extreme. Contents[show] Snap Circuits Jr.

SC Manual Electric Light & Switch DC Motor & Switch Sound Activated Switch Adjusting Sound Level Lamp & Fan in Series Lamp & Fan in Parallel. We feature + electronic circuits, circuit diagrams, electronic projects, hobby circuits and tutorials, all for FREE!

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These free electronic circuits are properly tested and can be found with schematic diagrams, breadboard image or PCB, a detailed explanation of working principle and a demonstration video. Nevonprojects holds the largest variety of electronics projects on the web with over + innovative electronics projects for beginners and final year.

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