Archive for category: RF Radio circuits

Active Antenna

RF Radio circuits | By: Diagram mania

  Active Antenna   An antenna with an integrated RF pre – amplifier

Active Antenna

RF Radio circuits | By: Diagram mania

  Active Antenna   An antenna with an integrated RF pre – amplifier

15dB UHF TV Antenna Booster

RF Radio circuits | By: Diagram mania

  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 voltage […]

Synthesized HF Receiver

RF Radio circuits | By: Diagram mania

  Synthesized HF Receiver   Very simple design and will cover the centre frequency plus or minus 20%. It is completely powered by a single 5 volt supply. A 10nf decoupling capacitor is fitted across every IC in the circuit, but there was not enough space in the circuit to show this. Receive frequency is […]

MC145151 PLL FM Transmitter

RF Radio circuits | By: Diagram mania

  MC145151 PLL FM Transmitter   This PLL has been designed with an old Motorola circuit :the MC145151. The VCO is based on a “Colpitz” oscillator equiped with a Fet Transistor.(J310) Two varicap Diodes are used in order to reduce the global noise of the VCO. In addition,these two diodes allow the PLL to keep […]

BIAS COMS PLL transmitter

RF Radio circuits | By: Diagram mania

  BIAS COMS PLL transmitter   This schematic originally comes from Bias Comms and was originally intended for use in combination with a BGY33 or BGY133 module. The PLL is very straightforward and should not be too difficult to build.

Wireless PLL Stereo FM TX with LCD

RF Radio circuits | By: Diagram mania

  Wireless PLL Stereo FM TX with LCD   Now you can use your MP3 Player to listen your favorite tunes through any FM stereo receiver. Wireless FM transmitter wirelessly connects portable music players to your car or home stereo quickly and easily. Just plug the FM Transmitter into the headphone jack of your MP3 […]

Wireless Microphone FM Transmitter

RF Radio circuits | By: Diagram mania

  Wireless Microphone FM Transmitter   This Wireless Microphone FM Transmitter has been a very popular project with beginners and experienced constructors alike. It has been used inside guitars and as the basis of a remote control system. I do however, receive many requests for a higher powered circuit and better microphone sensitivity. Now I […]

Video/Audio Wireless Transmitter

RF Radio circuits | By: Diagram mania

  Video/Audio Wireless Transmitter   Television signals operates as two separate transmissions. One for the video and the other for sound. And just like our project, two different devices are going to be built.

VHF/UHF TV Modulator

RF Radio circuits | By: Diagram mania

  VHF/UHF TV Modulator   Simple oscillator that generates a frequency in the VHF or UHF region. The oscillator 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 TV to the […]