PIC16F876 RF Power Meter 0-500MHz

RF Measurement has been an expensive work so far the cost of measuring instruments are concerned. This RF power meter is based on PIC16F876 microcontroller, AD8307 and 2x20 LCD display. Frequency range measurement is 0-500 MHz and Full documentation is included.This rf power meter kit has two push buttons to control the functions. Very cost...

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TV RF Amplifier 5W With BLW98

This application circuit is a TV RF amplifier for driving small UHF TV transmitters, with gain is 7dB and can amplify a signal between 470-860 MHz. Drive input the circuit with 1 to 1,5 Watts signal. Better use double layer PCB with the second layer connected to earth.Use a stabilized power supply 24 volts and at least 5 Amps. The transistor...

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TV RF Modulator With FM-AM Audio Input

Circuit DescriptionThis TV RF Modulator has option for AM and FM audio input mode, but frequency still controlled by PLL Oscillator.OscillatorThe RF-oscillator is available at pins 3-7. The oscillator operates as a symmetrical Colpitts circuit. The oscillator chip ground, pin 5, should be connected to ground at the resonance circuit shielding...

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Audio Video RF Modulator With LM2889

The LM2889 is designed to interface audio video RF modulator signals to the antenna terminals of a TV receiver. It consists of a sound subcarrier oscillator and FM modulator, video clamp, and RF oscillators and modulators for two low-VHF channels.Audio Video RF Modulator with LM2889 allows video information from VTRs, video disk systems,...

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MC1374 TV RF Modulator

The MC1374 includes an FM audio modulator, sound carrier oscillator, RF oscillator, and RF dual input modulator. It is designed to generate a TV signal from audio and video inputs. This TV RF modulator based MC1374 IC from Motorola with wide dynamic range and low distortion audio make it particularly well suited for applications such as video...

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2.4 GHz Power Amplifier

The following single-stage transistor linear amplifier posseses a gain of approximately 7 dB and an output power of 1 W in the 13 cm band (approx. 2.4 GHz). It is thus suitable for use, for instance, together with the 13 cm transmit converter. This hybrid power mixer equipped with a varactor diode type BXY. This mean that the described 2.4...

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Audio Video RF Modulator With MC44BS374

This Audio Video RF modulator application working on VHF UHF Band uses a MC44BS374TI from Freescale. MC44BS374 is audio and video modulator for use in Transmit Video audio and similar device.These IC are the next generation of the MC44BC374TI with the following new features :- TV output level 83dBuV- 5V and 3.3V compatible I2C bus- Logic...

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150 WATT FM AMPLIFIER BASED SD1407

This FM amplifier is originally designed by Broadcast Warehouse, based transistor SD1407 with redrawn schematic and redesigned pcb.You can drive the FM amplifier with maximum 1 watt input for 150 watts output.Working frequency of this fm amplifier is 88-108 MHz VHF band II and Power supply voltage 18-28 VDC.Download : schematic, PCB all...

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MC145151 PLL FM Stereo Transmitter

This transmitter use pll chip MC145151 from Motorola and stereo encoder chips BA1404 with vco built in. BA1404 from MC145151 is to overcome the single-frequency instability in the BA1404. Modulation of the emission control BB910 frequency. B571C kept in control procedures, the procedures required to prepare another.Amplifier section of this...

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300mW FM Transmitter 2SC2538

The FM transmitter using a varactor diode way radio, plus a Class C amplifier, RF output power of up to 300 mW more open to more than one kilometer distance communications. Select components: Q1 with ≥ 100 mA, Ft ≥ 300 MHz, β ≥ 100 tubes available 3 DG82, 3DG122, 3DG130, 2G711; Q2 with 2SC2538, 2SC1970, etc.. It must be noted that RF Baffles...

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PLL FM Transmitter With BH1415F 500mW

This article is wang1jin (Old: Primary Color love) for the design of RF EDNCHINA.COM FM transmitter board for further analysis, making friends for reference. This EDNCHINA PCB board can be free. Need friends can make reference to relevant websites Learn more. Designed with PLL technology, BH1415 FM transmitter system block diagram, LCD1602...

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High Quality wireless microphone Macsot MR-700

This is collected by the Macsot MR-700 wireless microphone system launch of the circuit for maintenance reference. High Quality Audio on receiver output.Active components:Microphone or Audio Preamplifier with IC MC4458Dynamic Audio processed with one NE571 From PhilipsFrequency Oscillator generated by one crystal 20.05 MHz and Varactor diode...

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CD4066 FM Stereo Encoder

Circuit schematics IC1-4069 in the Y1, Y2 formation of a 76 KHZ frequency of the oscillator, the Y3-Y6 isolation plastic, into IC2 dual JK flip-flop CD4027 composed of two components- frequency circuit, a symmetrical + / 38KHZ-19 KHZ and the square wave, + / -38 KHZ IC3 the square used to control analog switches CD4066, a stereo audio input...

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uPC1651 FM transmitter

The circuit has been produced by Japan's NEC as a major upc1651 IC devices, the high gain circuit, work stability, thereby ensuring the microphone performance. Use of FM transmitter. Used it 40 - 50 cm soft drag line for antenna, the effective range of more than 30 launch M. L carefully spacing adjustment and fine-tuning capacitor, will...

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FM Transmitter With Transistor 2SC1815

I Will have to introduce a system of simple and small FM transmitter. Not only does it meet the requirements of the launch distance, but also at the same time using microphone and voice input signal line, background voice. Modulation circuit surveillance has also joined the table first, so that they can better control and the proper use...

read more "FM Transmitter With Transistor 2SC1815"

Making Simple TV transmitter

(1) Soundless versionYou are familiar with the most simplest FM transmitter that I designed. Let's try to transform it into a TV transmitter. Just change the input from the audio to the video (video camera or VCR) and check the signal at your television set: in Europe, for instance, choose the channel 2 - 4 and turn the trimmercap at the...

read more "Making Simple TV transmitter"

Preamplifier 88-108 MHz

This VHF amplifier working on Band 2 Radio Spectrum tuning approximately 88 - 108 MhzThe Preamplifier circuit uses two 2N3819 FET's in cascode configuration. The lower FET operates in common source mode, while the upper FET, operates in common gate, realising full high frequency gain. The bottom FET is tunable allowing a peak for a particular...

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Microphone FM Transmitter

This simple transmitter operates from a 9V battery as shown above. The old FM mic system was not a perfect solution, so I built this kit and a mixer for the receivers. using three separate transmitter circuits and a mixer on the receiever, the choir voices were perfect and cleanly reproduced." From the notes I made experimentally, C3 is vital...

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FM Transmitter with 4 Transistors

This circuit provides an FM modulated signal with an output power of around 500mW. The input Mic preamp is built around a couple of 2N3904 transistors, audio gain limited by the 5K preset. The FM Transmitter oscillator is a colpitts stage, frequency of oscillation governed by the tank circuit made from two 5pF capacitors and the inductor....

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Voice FM Transmitter Circuit

It is illegal in most countries to operate radio transmitters without a license so take care with transmitter circuits. This FM Low Power circuit may be tuned to operate over the range 87-108MHz band II, with a range of 20 or 30 metres.Active components in this circuit are BC548 transistors. Although not strictly RF transistors, they still...

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VHF UHF TV modulator

Simple TV Modulator that working on VHF UHF Band, the oscillator generates frequency is modulated with the video signal and the modulated carrier wave thus generated is fed into the TV set's aerial input via a cable. Then all that remains to do is tune the VHF UHF TV set to the correct frequency.The harmonics generator converts the oscillator...

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TV Transmitter Band I and III

This TV transmitter working on VHF Band I and III, using negative sound modulation and PAL video modulation. This is suitable for countries using TV systems B and G, like Australia and Indonesia. Band I (VHF Low) and Band III (VHF High).This circuit has not been tested at UHF frequencies. The modulated sound signal contains 5.5 - 6MHz by...

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300mW FM Transmitter 2SC2538

The FM transmitter using a varactor diode way radio, plus a Class C amplifier, RF output power of up to 300 mW more open to more than one kilometer distance communications.Select the components of this fm transmitter: Q1 with ≥ 100 mA, Ft ≥ 300 MHz, β ≥ 100 tubes available 3 DG82, 3DG122, 3DG130, 2G711; Q2 with 2SC2538, 2SC1970, etc..It must...

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FM Stereo Transmitter With MC145151

This fm stereo transmitter use pll chip MC145151 from Motorola and stereo encoder chips BA1404 with vco built in. MC145151 IC used is to overcome the single-frequency instability in the BA1404. Modulation of the emission control BB910 frequency. B571C kept in control procedures, the procedures required to prepare another.Parts List and...

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PLL FM Transmitter With BH1415F

This Stereo FM Transmitter based on BH1415F wireless audio link IC. Phase Locked Loop controller uses Microchip PIC16F628 and the the PLL frequency programming can be displayed with 8×2 and 16×2 LCD display.The frequency range can adjustable from 88-108 MHz.See PLL FM Transmitter With BH1415F schematic belowPLL FM Transmitter With BH1415F...

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Macsot MR-700 High Quality wireless microphone

This is collected by the Macsot MR-700 wireless microphone system launch of the circuit for maintenance reference. High Quality Audio on receiver output.Active components:Microphone or Audio Preamplifier with IC MC4458Dynamic Audio processed with one NE571 From PhilipsFrequency Oscillator generated by one crystal 20.05 MHz and Varactor diode...

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FM Stereo Encoder CD4066

Circuit schematics IC1-4069 in the Y1, Y2 formation of a 76 KHZ frequency of the oscillator, the Y3-Y6 isolation plastic, into IC2 dual JK flip-flop CD4027 composed of two components- frequency circuit, a symmetrical + / 38KHZ-19 KHZ and the square wave, + / -38 KHZ IC3 the square used to control analog switches CD4066, a stereo audio input...

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FM transmitter With uPC1651

The fm transmitter circuit has been produced by Japan's NEC as a major upc1651 IC devices, the high gain circuit, work stability, thereby ensuring the microphone performance.Use of FM transmitter Used it 40 - 50 cm soft drag line for antenna, the effective range of more than 30 launch M. L carefully spacing adjustment and fine-tuning capacitor,...

read more "FM transmitter With uPC1651"

FM Transmitter With Transistor 2SC1815

Will have to introduce a system of simple and small FM transmitter. Not only does it meet the requirements of the launch distance, but also at the same time using microphone and voice input signal line, background voice. Modulation circuit surveillance has also joined the table first, so that they can better control and the proper use of...

read more "FM Transmitter With Transistor 2SC1815"

Making Simple TV transmitter

(1) Soundless version, You are familiar with the most simplest FM transmitter that I designed (left). Let's try to transform it into a TV transmitter. Just change the input from the audio to the video (video camera or VCR) and check the signal at your television set: in Europe, for instance, choose the channel 2-4 and turn the trimmer cap...

read more "Making Simple TV transmitter"

FM Preamplifier 88-108 MHz

This VHF preamplifier working on Band 2 FM Radio Spectrum tuning approximately 88 - 108 MHz. The Preamplifier circuit uses two 2N3819 FET's transistors in cascode configuration. The lower FET operates in common source mode, while the upper FET, operates in common gate, realising full high frequency gain. The bottom FET is tunable allowing...

read more "FM Preamplifier 88-108 MHz"

Microphone FM Transmitter

A portable FM transmitter that can be used to replace a FM microphone. This simple transmitter operates from a 9V battery as shown above. The old FM mic system was not a perfect solution, so I built this kit and a mixer for the receivers. using three separate transmitter circuits and a mixer on the receiver, the choir voices were perfect...

read more "Microphone FM Transmitter"

FM Transmitter with 4 Transistors

This circuit provides an FM modulated signal with an output power of around 500mW. The input mic preamp is built around a couple of 2N3904 transistors, audio gain limited by the 5k preset.The FM Transmitter oscillator is a colpitts stage, frequency of oscillation governed by the tank circuit made from two 5pF capacitors and the inductor....

read more "FM Transmitter with 4 Transistors"

Voice FM Transmitter Circuit

It is illegal in most countries to operate radio transmitters without a license so take care with transmitter circuits. This FM Low Power circuit may be tuned to operate over the range 87-108MHz band II, with a range of 20 or 30 metres.Active components in this circuit are BC548 transistors. Although not strictly RF transistors, they still...

read more "Voice FM Transmitter Circuit"

TV Transmitter Band I and III

This TV transmitter working on VHF Band I and III, using negative sound modulation and PAL video modulation. This is suitable for countries using TV systems B and G, like Australia and Indonesia.This circuit has not been tested at UHF frequencies. The modulated sound signal contains 5.5 -6 MHz by tuning C5. Sound modulation is FM and is compatible...

read more "TV Transmitter Band I and III"

VHF UHF TV Modulator

Simple TV Modulator that working on VHF UHF Band, the oscillator generates frequency is modulated with the video signal and the modulated carrier wave thus generated is fed into the TV set's aerial input via a cable. Then all that remains to do is tune the VHF UHF TV set to the correct frequency.The harmonics generator converts the oscillator...

read more "VHF UHF TV Modulator"