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Radio and television boroadcasting or receiving circuit

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3 channel RF remote control

3 channel RF remote control

This is a 3 channel RF remote control project.The transmitter powered by 3V battery range about 10 m.This remote control I use PIC12F509 from Microchip which is a 8-pin single-chip microcontroller designed for low pin count applications with 1 K words flash memory and 41Byte SRAM and some special features such Power-saving Sleep mode,Wake-up from Sleep on pin change.

http://www.coolcircuit.com/project/rf_remote/index.html

Automatic Repeater

Automatic Repeater

The circuit was designed to create an automatic repeater that would retransmit a received signal over the amateur radio frequency band.The operation of the circuit initiates by commencing the squelch circuit of radio 1 as it receives a radio signal.

http://www.zen22142.zen.co.uk/Circuits/rf/rxtx.htm

Op Amp Radio

Op Amp Radio

Here is a simple radio that is easy to build and inexpensive. In fact, you probobly have all the parts you need in your junk box. You will be suprised at the great reception with this little set.

http://www.aaroncake.net/circuits/radio.htm

Old Time Crystal Radio

Old Time Crystal Radio

This little project is a sure interest grabber with students of electronics of any age. Recommended for Boy Scout Merit Badge and Cub Scout Activity for requirements.

http://www.hobbytron.net/8893.html

Video Effects Unit

Video Effects Unit

The author enjoys producing his own video compilations of music tracks. This normally involves recording a few hours of music videos from MTV and other music programmes, then copying selected tracks onto another tape.

http://www.web-ee.com/Electronic-Projects/projects/video_effect/index.htm

Wireless Monitoring System

Wireless Monitoring System

Alberto MC68HC908-based wireless monitoring system is adaptable for use in domestic and industrial settings. The central monitoring station, which consists of a computer-controlled receiver with a relay output and LCD, logs and displays data from up to 20 different sensors.

http://www.circuitcellar.com/library/print/0604/RicciBitti-167/index.htm

Infra/radio remote control transmitter/receiver with PIC

Infra/radio remote control transmitter/receiver with PIC

This is a general purpose remote control project with using programmable PIC microcontrollers. Schematics are shown for using infrared (RF) or radio (RF) media. If you are not familiar with microcontroller programming, you can use fixed encoder and decoder integrated circuits instead. Well-known such IC-s are Holtek HT-12D, HT-12E and Motorola MC145026, MC145027, MC145028.

http://jap.hu/electronic/codec.html

Radio Control Encoder

Radio Control Encoder

A modern RC encoder, whether it be for an AM or FM system, would typically produce of a number of pulses corresponding to the number of channels, plus a longer sync pulse to enable the decoder at the receiver end to extract the pulses in the correct order.

http://users.picbasic.org/projects/RcEncoder/radio_control_encoder.htm

Wireless Radio Data Transfer with TX433 and RX433

Wireless Radio Data Transfer with TX433 and RX433

Wireless data transfer with these cheap modules from Velleman or QualityKits. This first prototype uses two breadboards. One sending and one receiving. My aim was to achieve a protocol with which transmitting and receiving data is pretty much reliable. The future setup will have full two-way communication with CRC and adjusting baud rates if needed.

http://www.techdesign.be/projects/005/005.htm

4:1 balun for 160 to 10 meters

4:1 balun for 160 to 10 meters

Stack two T-80-2 powdered iron toroid cores together. Use super glue, or some other means to hold the two cores together.

http://www.hard-core-dx.com/nordicdx/antenna/feed/4_1balun.html


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