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0.1-3.5GHz Prescaler - This handy prescaler divides input frequency by 1000. It
takes maximum input frequency of 3.5GHz and converts it into 3.5MHz that may be
measured using standard frequency meter….(schematic design added 08/08/08) |
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1.5V Battery operated FM rebroADCast transmitter - This implementation is adapted
to rebroadcast the output of a CD player, television receiver, or radio receiver. I
use it so that I can move about the house and listen to my favorite programs without
disturbing others. Within and the house, I find that I can get 10 to 20 meters
away....(added 6/07) |
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1.5W VHF Amplifier - This project will explain the basic function of a class-C
transmitter. I will explain how to dimension a transmitter and the purpose of the
different components. I will also explain how you can build a 1.5W PA transmitter. The
project will include PCB, ....(schematic design added 03/08) |
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10.7MHz FM Detector - (design added 8/03) |
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100W FM AmplifIER - This Power amplifier is equipped with a bipolar transistor,the
famous MRF317 As lots of FM amplifier application ,the power transistor is in a C
class bias. All the impedance networks (Input & Output) have been determined by using
the…(circuit design added 06/07/08) |
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150mW FM Transmitter - (circuit / schematic design added 6/06) |
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15dB UHF TV Antenna Booster - This is an UHF band TV antenna preamplifier circuit
With 15dB gain to build easily. It is formed based on BF180 UHF Transistor. The first
stage is an band pass filter constructed by the C1, CV1, L1, L4, C7 and C3, the second
stage is a base-common…(electronic design added 08/08/08) |
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1GHZ Frequency Meter - This is 1GHz frequency counter with 100KHz resolution.
Meter is built in around PIC16F84A microcontroller and SAB6456 / U813BS prescaller....(electronic
circuit added 07/07/07) |
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2 Transistor LED Flasher (Bill Bowden) - This circuit will flash a bright LED (500
mcd) as an attention getting device or fack car alarm. Component values are not
cirtical and other transistors may be…...(circuit / schematic design added 6/06) |
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20W FM Amplifier - This Power amplifier is equiped with two Philips bipolar
transistors : the BLV10 & BLW87. As lots of FM amplifier design, the RF transistors
are in a class C bias. The FM amplifier has a 21 dB gain with a 55 to 65%
efficiency…(circuit added 04/08). |
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27 MHz FM Receiver - The FMR-201 is a crystal controlled single channel receiver,
comprising of receiving, decoding and open collector output sections….(circuit added
08/07/06) |
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27MHz/ 49 MHz Walkie Talkie - Lots of people are requesting walkie-talkie and RF
remote control schematics, so here is some. Building these circuits needs special
equipment and expertise in RF circuits. If you are going to experiment with these
circuits, please ....(circuit added 08/08/08) |
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2-transistor FM Transmitter - While re are a plethora of similar 2-transistor
schematics available, this one is above average. A major improvement over little
1-transistor circuit that we've discussed previously, this transmitter consist of two
stages. first transistor is used to amplify audio,....(added 6/06) |
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3 Transistor FM Transmitters (Andy Collinson) - have used a pair of BC548
transistors in this circuit. Although not strictly RF transistors, they still give
good results. I have used an ECM Mic insert from Maplin Electronics, order code FS43W.
It is a two terminal ECM, but ordinary dynamic mic inserts can also be used, simply
omit the front 10k resistor....(design added 8/03) |
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30W VHF FM Amplifier for 88-108 MHz with BLF245 MOSFET - The achievement of this
30-watt amplifier has been designed to take place on a heatsink microprocessor PC
equipped with its fans, the advantage of this method of cooling has been selected for
the fact that …(French schematic added 08/08/08) |
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3W FM Transmitter - This is the schematic for an FM transmitter with 3 to 3.5 W
output power that can be used between 90 and 110 MHz. Although the stability isn't so
bad, a PLL can be used on this circuit. This is a circuit that I've build a few years
ago for a friend, who used it in combination with the BLY88 amplifier to obtain 20 W
output power. From the notes that I made at the original schematic, it worked fine
with a SWR of 1 : 1.05 (quite normal at my place with my antenna). (electronic circuit
added 08/08) |
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4 Transistor FM Receiver - This is a pocket sized receiver I built in 1994. The
idea was to make a simple but useable receiver running off 3V. My previous 6
transistor receiver was more bulky, requiring 12V. This meant 10 x AA cells. I
designed and made a PCB, ..(circuit added 08/07/06) |
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4-Transistor Transmitter (Paul C. Sherby) - This circuit provides an FM modulated
signal with an output power of around 500mW. The input microphone pre-amp is
built around a couple of 2N3904 transistors (Q1/Q2), and audio gain is limited by the
5k preset trim potentiometer. The oscillator is a Colpitts stage, frequency of
oscillation governed by the tank circuit made from two 5pF ceramic capacitors and the
L2 inductor....(electronic circuit added 05/07) |
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5 Watt FM Transmitter with Antenna 88-108 MHz - Two stages -- AUDIO AMPLIFIER AND
OSCILLATOR and RF POWER AMPLIFIER (electronic schematic / circuit added 11/05) |
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5 Watt UHF TV Amplifier - This small circuit is a Linear amplifier for driving
small UHF TV transmitters. Its gain is 7dB and can amplify a signal between 450-800
MHz. You can drive the circuit with 1 to 1,5 Watts signal. Better use double layer PCB
with the second layer connected to earth...(schematic added 08/08/08) |
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5W PLL Stereo Transmitter with LCD - Here's PLL FM transmitter circuit from china.
This circuit uses the familiar 2SC1971 for final power amplifier stage. …(electronic
circuit added 08/08/08) |
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70-120MHz FM Receiver - This simple one chip FM receiver / TV tuner will allow you
to receive frequencies from 70 up to 120MHz. With this small receiver it is possible
to pickup TV stations, entire 88, 108MHz FM band, aircraft conversation and many other
private transmissions.....(added 05/06/07) |
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98-108MHz FM audio transmitter - ….(electronic schematic added 04/09) |
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A Simple FM Stereo Transmitter - (circuit added 6/07) |
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A small FM transmitter (SMD) - (electronic design added 6/07) |
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Add a Signal strength display to an FM Receiver IC - 09/05/02 EDN-Design Ideas:
The Philips (www.semiconductors.philips.com)TDA7000 integrates a monaural FM-radio
receiver from antenna connection to audio output. External components
include one tunable LC circuit for local oscillator, a few capacitors, two
resistors, and a potentiometer to control variable-capacitance-diode
tuning.....(design idea added 1/05) |
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AM FM Simultaneous Transmitter Using Digital IC - (electronic design idea added
09/08) |
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Am/Fm/SW Active Antenna - This circuit shows an active antenna that can be used
for AM, FM, and shortwave SW. On shortwave band this active antenna is
comparable to a20 to30 foot wire antenna. This circuit uses receivers that use untuned
wire antennas, such as inexpensive units and car radios....(added 6/06) |
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AN-146: FM Remote Speaker System - National Semiconductor Application Note
(app note added 07/08/09) |
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AN-543-Monaural FM Transmitter DSP, 20,641 bytes -
AN-543-MonauralFMTransmitter-Analog Device Application Notes (app note added
6/06) |
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AN-543-Stereo FM Transmitter DSP, 26,085 bytes - AN-543-StereoFMTransmitter-Analog
Device Application Notes (app note added 6/06) |
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BH1415F FM Stereo PLL Transmitter - Transmitter power amplifier, the output signal
from BH1415F by 2 SC9018, 2SC3355, 2SC2053 amplified signal can reach more than 500 mW,
adjusting well to achieve greater power. Measured by the pull rod antenna used to be
launched in the open 800 meters above. Uses external antenna will be launched even
further. attention in 2053 ....(design added 04/05/06) |
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Ck-3V FM Transmitter - Circuit design (added 02/05) |
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Coilless FM transmitter! - (electronic circuit added 10/05) |
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Count-down timer - Scroll down to find link to circuit drawing and circuit
explanation….(design added 06/09) |
