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23 Jul 2014

mini-fm-transmitter

electronics-diy shows you how to easily make a mini FM transmitter:

It transmits FM waves so you could easily receive the signals on your mobile phone, radios, etc. As the name and the picture indicates it is very small and is approximately the size of a 9v battery clip. With this FM transmitter you could start your own mini FM station. The circuit uses BC547 transistor to amplify the signal and then frequency modulate it. It uses “frequency modulation” most commonly known as FM, the same principal to transmit audio signals captured by the microphone.

[via]

Mini FM transmitter - [Link]

22 Jul 2014

Stream your music to your entire home !!!

Zola Lab – Portable FM Transmitter

Parts:
Lipo 3.7v
Sparkfun Circular LED
Adafruit Si4713 FM Radio Transmitter
2 x Arduino Pro mini
Sparkfun Rotary Encoder
Catalex 4-Digits 7seg Display
Switch
Lipo Charger

On the top there is a: P2 audio input, a switch on/off, and a female micro-usb for charging Lipo.

[via]

DIY portable FM transmitter - [Link]

19 Jul 2014

F6UPB4YHXLMKV8M.MEDIUM

by ASCAS @ instructables.com:

Have you ever wanted to broadcast your own radio station within the neighborhood? Ever get curious on where people get those “Surveillance Bugs” from spy and action movies? This small and simple FM transmitter is the toy that geeks have always wanted.

FM transmitters can be complicated to build, that’s why I’m teaching you how to make a foolproof FM transmitter. There’s no need to buy kits, this tutorial includes the PCB layout and the schematics. It has a range of up to 1/4 mile or more. It’s great for room monitoring, baby listening and nature research.

The Ultimate FM Transmitter (Long Range Spybug) - [Link]

16 Jun 2014

FRZRNR3HWDFC8FB.MEDIUM

lamefreaks @ instructables.com writes:

In this instructable I’m going to show you how to build your own portable audio transmitter. This transmits FM waves so you could easily get the signals on your mobile phone, radios, etc. As the name and the picture indicates it is very small and is approximately the size of a 9v battery clip.

Mini Audio Transmitter - [Link]


29 Nov 2013

smallestFM

A team of Columbia Engineering researchers, led by Mechanical Engineering Professor James Hone and Electrical Engineering Professor Kenneth Shepard, exploring the properties of graphene have demonstrated a new electro-mechanical resonant component.

The resonator’s structure consists of a 2-4 micrometer long strip of graphene suspended over a metal gate electrode. The strip of graphene has a natural resonance governed by its physical dimension and is used in the demonstration as the frequency determining element in an RF feedback oscillator circuit. Applying a voltage to the gate electrode stresses and deflects the graphene strip changing its resonant frequency. The team applied baseband audio and tones to the gate electrode to produce a 100 MHz FM signal.[via]

Tiny FM Transmitter uses Voltage Controlled Graphene Resonator - [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]

20 Nov 2013

Ray Wang writes:

Hi, I recently built a reflow toaster oven using an Arduino. I know it’s pretty standard stuff, but my version has an automatic oven door opener (using a servo) and circulation fan to speed up the cooling time, and remote notification using an RF transmitter

[via]

Reflow toaster oven using an Arduino - [Link]

18 Nov 2013

TX5823-MC495A-soldering-final-product-600x402

Oscar writes:

The compact FPV system I have built is only about 20g, now even my mini quadcopter and micro hexacopter can carry this FPV camera and video transmitter. In this post I will share with you what are the parts you will need and how I made it.

Super light weight RC FPV quadcopter DIY solution - [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]

26 May 2013

building-simple-fm-transmitter

electronics-diy.com writes:

This article shows you how to build a very simple FM transmitter from thirteen components, a Printed Circuit Board (PCB) and a 9v battery. This project was designed to be mounted on a PCB, however you don’t have to. You could construct the project on Vero board (strip board) or any other 0.1” pitch style of project board. If you just want to experiment with this circuit, you don’t even need a board; you can just solder the component s together and let the completed project just rest on the work top. No matter which style you choose, try to keep all component leads nice and short. You could also make the PCB much smaller than the one shown here which is approx. 3 cm square. This is a good size to keep the unit small but nicer to work on for beginners. If you wanted to make one really small, you could use all SMT parts.

Simple FM Transmitter - [Link]



 
 
 

 

 

 

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