|
|
Category: Inside Circuits Views: 3820 Rank: 10 This active antenna schematic can be used to frequency range from 10 KHz to 100 MHz. The length of the Antenna can be between 0.5 to 1 meter long. The power consumption is 20-30mA.  Use the shortest posible length of cable between the antenna and the transistor. Cable 50 or 75 Ohms is suggested, for both input and output. Datasheet file1: Click here to download BF247C.pdf datasheet.
Related circuits DC-10Khz frequency-voltage converter The converter generates an output voltage which is linearly proportional to the input frequency waveform. Each zero crossing at the comparator"s input causes a precise amount of change to be dispensed into the op amp"s summing junction. This charge in turn flows through the feedback resistor... Buffer Lc Data And Clock Lines Circuit The I2C serial bus is a popular two-wire bus lor small-area networks. I2C Clock and Data lines have open collector (or drain) outputs for each device-on the network. Only a single pull-up resistor is needed. With this arcliitecture, each device can talk on the network, rather than just listen.... Three-Power-Level Triac Controller Circuit Three power levels are supplied by the two logic inputs of this enhanced circuit. R5, D4, D5, and 02 form a power supply for the logic IC. This transceiver has a 3-stage transmitter and a direct-conversion receiver. Ql is the transmitter"s oscillator, an The crystal operates into a complex load at series resonance. Ll, Cl, and C2 balance the crystal at zero reactance. Capacitor Cl fine-tunes the center frequency Musical envelope generator and modulator When a gate voltage is applied, Ql is turned on and capacitor C is charged via the attack pot in series with the 1 K resistor varying this pot, attact time constant. A fast attack gives a percussive sound, a slow attack the affect of "backward" sounds. When the gate voltage returns to its off... ICla and IClb are wired as a slow astable multivibrator and IClc-ICld are wired as a fast astable. The output of the slow astable modulates the frequency of the fast astable, and the output of the fast astable is fed to the external speaker via the Ql VMOS power FET amplifier stage. This is an on-off control with isolated, low voltage input. Since the switching action is very rapid, compared with the response time of the lamp and the response of the eye, the effect produced with audio input is similar to a proportional control circuit Active TV Coupler. Amateur Circuit Engineering
nifcell-board-explanation
Comments
wrote on Aug 27, 2007
I have yet to see it !!
James wrote on Jan 19, 2008
Looks good, I will give this a try. How would you extend the frequency up to cover the top end of the normal FM band (108MHz?)
bryce wrote on Jun 13, 2010
so would this extend the wireless range of a walkie talkie
Facebook Comments
Most searched
lm3915
Results: 15 Count: 10828
Automatic battery charger
Results: 960 Count: 9399
12v counter
Results: 965 Count: 8090
signal generator using XR2206
Results: 3108 Count: 7494
multivibrator
Results: 243 Count: 7487
12f629 switch
Results: 1604 Count: 7343
optocoupler
Results: 52 Count: 7111
bcd
Results: 40 Count: 6357 |
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
|
|
