|
|
Category: Inside Circuits Views: 5715 Rank: 10 This is a nice 2 Watts FM transmitter. It has a Super-Sensitive pre-amplification with BC109 and BC177 with more than 100% signal modulation. The job finish the 2N2219 by Motorola. For the Coils you should use 1mm wire(enameled), L1= 3 turns - 10mm diameter, L2= 1 turn - 10mm diameter. R9 trimmer controls the modulation gain. The tunning is easy by controlling C9 trimmer (88-108 MHz). The RFC J should be the VK220J with ferrite (VK200 is not suitable).  You will be amazed how well this little monster can transmit several kilometers excellent quality sound. Feed input from a simple cd player or PC (win amp) or just connect a microphone. Enjoy! Datasheet file1: Click here to download BC109.pdf datasheet. Datasheet file2: Click here to download BC177.pdf datasheet. Datasheet file3: Click here to download 2N2219.pdf datasheet.
Related circuits The input signal is applied through R3 to the inverting input of the summing amplifier and the output is taken from the first integrator. The summing amplifier will maintain equal voltage at the inverting and non-inverting inputs. Defining 1/R1C1 as 1 and 1/R2C2 as u>2> th^ is now a convenient... The circuit is simple and foolproof if wired correctly. Under normal conditions, only lamps 1 and 3 should be lit. Simple Lcd Display Power Supply Laptop computers often use large-screen LCDs, which require a variable and a negative supply to ensure maxi The input audio signal is fed to pin 3 of Ul, an LM386 low-voltage amplifier, via C3 and Rl. Potentiometer Rl sets the drive or volume level. Ul, which serves as a driver stage, can be set for a gain of from 20 to 200. The output of Ul at pin 5 is fed to U2—a 377 dual two-watt amplifier... Low-power-magnetic-current-sensor A transducer senses a direct current magnetically, providing isolation between the input and the output. The detecting-and-isolating element is a saturable reactor, in which the input current, to be measured, passes through a one-tum control coil. The transducer provides an output of 0 to 3... The linear charging ramp is most useful where linear control of voltage is required. Some possible applications are a long period voltage controlled timer, a voltage to pulse width converter, or a linear pulse width modulator. Ql is the current source transistor, supplying constant current to the... This circuit disables the air conditioner compressor when additional engine power is required. It does so by monitoring the engine vacuum at the intake manifold. Ifthe vacuum drops to 40% of its normal level, the compressor clutch is disabled, removing the air conditioner load from the engine.... Temperature measurement using two cables In those cases we want to measure the temperature in an area far from where it is. The imaging unit installed, you should find some way to connect the latter with the necessary sensor. The cables we use most often will have three two conductors for power sensor and one more to carry the signal...
Articles & Projects
This ambit is a simple two transistor (2N2222) mini FM transmitter. No authorization is appropriate for this transmitter according to FCC regulations apropos wireless microphones. If powered by a 9 volt array and acclimated ...
Low Power FM Transmitter s Figure 1 - Low Power FM Transmitter. Because the trimmer cap is very sensitive, make the final frequency adjustment on the receiver. When assembling the circuit, make sure the rotor of C3 is connected to the +9V supply. This ensures that there will be minimal .... Simpl...
#1 SainSonic CZH-5C FM Transmitter Mini Radio Stereo Station PLL LCD with Antenna *Silver* Cheapest Price ... Notes: Inner circuit board version may vary (slightly modifications). Technical Specification Power supply ...
In this section discuss about the series of mini fm transmitter, with broadcast coverage of about 300-400 meters. when using a 9 volt working voltage, the transmit power of about 300 meters and when using the working voltage ...
In this section discuss about the series of mini fm transmitter, with broadcast coverage of about 300-400 meters. when using a 9 volt working voltage, the transmit power of about 300 meters and when using the working voltage ...
A lot of FM transmitter circuits have been already published here. This just another one, a simple two transistor FM transmitter.The first stage of the circuit is a preamplifier stage based on transistor Q1. This is a collector to base ...
FM Transmitter Kit. An Electronics DIY kit
Build your own Surveillance Spy Bug. FM Transmitter Bug. No special parts ne...
Comments
Berek Jeams wrote on Jan 9, 2008
remarkable!! Mine goes 3 km far! Just great
Manai wrote on Apr 11, 2008
very very good FM transmitter,i will try to do it but i need the PCB circuit :)
nermin wrote on May 17, 2008
Yes,another small transmitter.Nice but of course can not give 2W of output power.Anyone who have power meter can see that.According My previous works this thing could give some 100-300 mW,depending of many factors.But for beginners nice project for test.Good luck.
Tarun Dasgupta wrote on Sep 29, 2008
Nice project indeed ! Details of the RFCJ is needed (inductance ect.) so that one can make it of its own.Also, the output impedence (required for matching the antenna) is not mentioned.
Best regarts,
Tarun.
hama ersal wrote on Oct 31, 2008
hi .. yeah its simple
wrote on Nov 2, 2008
Nice project. What is the RFCJ, and is C8 also a variable capacitor?
wrote on Nov 2, 2008
could u explain how L1 and L2 is connected, it would be greatly appreciated!
MAHESH wrote on Nov 20, 2008
kindly tell me how many turns for rfcj&how to connect l1 l2
anas wrote on May 21, 2009
Nice project. but what is the range
abhi wrote on Aug 14, 2009
need the value of output transformer
abhi wrote on Aug 14, 2009
need the value of output transformer,value of RFCj
kap aryan wrote on Aug 20, 2009
this is the simpliest schematic diagram i see and now alread tested
wrote on Jan 14, 2010
Hi, friend! You forgot the coils details uh?
2nel wrote on Feb 8, 2010
Need the value of output transformer,value of RFCj ...Grazie!
flö wrote on Jan 17, 2012
I can't find that "VK220J" anywhere on the web. is there an alternative? did that part ever exist?
Frank wrote on Nov 30, 2011
yo what the f...k is the value of L3
Facebook Comments
Most searched
lm3915
Results: 15 Count: 10857
Automatic battery charger
Results: 960 Count: 9476
12v counter
Results: 965 Count: 8142
signal generator using XR2206
Results: 3108 Count: 7533
multivibrator
Results: 243 Count: 7501
12f629 switch
Results: 1604 Count: 7360
optocoupler
Results: 52 Count: 7120
2 digit counter ic 4026
Results: 9619 Count: 6452 |
Accounts area
Circuits
Audio Filters
Stereo Circuits Ultrasonic Circuits Amplifiers Audio Oscillators Preamplifiers Audio Mixers Equalizers Tone Balance Beeper Buzzer Vacuum Tubes Valves Musical & effects Microphone Circuits
PLL Circuits
UHF circuits VHF Circuits FM radio GPS Circuits Jammer Circuits RF Transmitters RF Receivers RF Amplifiers AM radio Antenna Circuits FM Transmitter Transceiver Circuits
Demodulators
Buffer Circuits Triac Circuits Mosfet Circuits Sequencer 555 Timer Circuits Doorbell Circuits Switching Circuits Remote Control Toy H Bridge Circuit Game Circuits Keypad Circuits
Metal Detector Circuits
Liquid Sensing Circuits Light Sensing Circuits Voltage Detector Circuits Air-Gas Detection Circuits Human Sensing Circuits RF & Radiation Medical Circuits Sensor Circuits Magnetic circuits Optical Sensing Circuits Hall Effect
Varius Circuits
Astable Colpitts Crystal Hartley RF Sine wave Square wave Volt controlled Wein Bridge Monostable Circuits Pierce
Tesla Circuits
Inverter Circuits Free Energy Circuits Chargers AC to DC & DC to DC Solar Cell Circuits Current Limiting Mirco Power Circuits High Voltage Switching Power Supplies
Timer Circuits
Voltmeters Frequency meter Meters Circuits Counters Clock Circuits Checker Circuits Delay Circuits Thermometer Circuits VU Meters
Infrared
Xenon Lighting Light Sensing Laser Led circuits Fluorescent Circuits LCD circuits Light Dimmers
Readout Circuits
Logic Circuits Digital to Analog Display Circuits Analog to Digital Data Logging Data Bus Circuits Decoder Circuits
Voltage to Pulse
Current to Voltage Frequency to Voltage RF Converter Circuits Sine to Square Wave Voltage to Current voltage to frequency Period to Voltage
Video Mixer
Video Wall circuits TV Video Circuits Modulator Camera Circuits Television Photo Flash Video Amplifier
Stepper Motor
Remote Control Servo Circuits Robotics Direction Finder Power Control Relay Circuits Motor Control Circuits
Arduino projects
PIC Microcontroller AVR Microcontroller Programmers 68HC11 Microcontroller 8051 / 8052 MCU Circuits
|
|
Electronic Circuits Schematics Projects
|
|
