There are several RS232 transceiver circuit used for commond communicated between microcontroller and other devices such as PCs or devices rs232. Here is a collection of RS232 transceiver circuits that use well-known for today. The circuit using MAX232,....
The recommended Prescaler is ridiculously simple. It consists of just one IC, a TV tuner prescaler, the Philips SAB6456A, which can divide by 64 or by 256. This chip is widely available both new and in the surplus market at much lower prices than....
Here`s a simple 433.92 MHz short range radio beacon that may be handy for locating downed R/C planes, lost ballons, model rockets - or perhaps hidden....
Here`s video transmitter circuit is working on the UHF channel frequency 470-580 MHz channel 21-34. This video transmitter can radiate as far as 30-100 meters by using a cable 10-20 cm. If you have a plan to amplify this video transmitter`s signal, please....
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....
These Intersil RS-485/RS-422 devices are "fractional" unit load (UL), BiCMOS, 5V powered, single transceivers that meet both the RS-485 and RS-422 standards for balanced communication. Unlike competitive devices, this Intersil family is specified for 10%....
The ATA5743 is a multi-chip PLL receiver device supplied in an SSO20 package. It has been especially developed for the demands of RF low-cost data transmission sys- tems with data rates from 1 kBaud to 10 kBaud in Manchester or Bi-phase code. The receiver is....
The choice of IF is usually determined from availability of filters with desired characteristics. For communication receiver or transceiver the requirements for main selective element are very high, and usually two types of filters are used:....
This page identifies all the hardware modifications necessary to adapt a Kenwood TK-931 transceiver for operation as a 2 watt exciter for 927 MHz repeater service. Not shown here is the effort required to program the radio for the desired operating....
The TRW-24G connector pins is too small (~1mm pin to pin). For that I order the adaptor PCB that is convert the small connector of RF module, to standard pin connector. The pin order of RF modules in schematic diagram is based on pin order of pin adaptor,....
Here is the circuit diagram of an FM transmitter using the IC UPC1651. UPC1651 is a wide band UHF Silicon MMIC amplifier. The IC has a broad frequency response to 1200MHz and power gain up to 19dB. The IC can be operated from 5V DC. The audio signals picked....
This is an 8MHz amplitude modulated (AM) radio transmitter, which I built mainly for work, and also as an exercise in electronics (it is the first RF transmitter I`ve ever built). We wanted to have a simple radio transceiver design at our disposal for some....
The CAMD CM8888 8888-2 is a fully integrated DTMF Transceiver, featuring adjustable guard time, Automatic Tone burst mode, call progress mode, and a fully compatible 8051 8086/8 Microprocessor Interface The CM8888 8888-2 is manufactured using....
This application note covers the design of a UHF ingress filter for a Satellite DBS tuner. The filter provides 20dB of stopband attenuation from 54-650MHz with 0.7dB in-band insertion loss....
A number of ham radio operators have made their start on the 10 GHz amateur band using commercial-surplus microwave transceivers made by M/A-Com. These units were originally built in white-painted metal enclosures and are known as "White Boxes" They can be....
Any mode (e. g. CW, AM, SSB, FSK) which is initiated in the HF transmitter or transceiver can be regenerated at LF (100 to 200 kHz) using this simple converter. The output at LF can be used to drive an LF Power Amplifier. The February, 2000 issue of Amateur....
This is a low cost FM booster circuit to receive far away fm stations clearly on your radio in your local area. The circuit diagram of FM booster consist of a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570. The output of the....
TA1317ANG is a deflection processor IC for a large and wide picture tube. TA1317ANG incorporates an EW, a vertical distortion correction circuit and a dynamic focus correction circuit. It CAN 2 control various functions via I C BUS line. By Toshiba....
The Motherboard, or Mobo v4. 3. 4 BETA, is an addon board to plug onto the Softrock v6. 3 RxTx, to transform it into an all band (160-10m) HF transceiver electronically controlled via USB. Mobo v4. 3. 4 BETA is developed by a team of radio amateurs. The....
This UHF antenna amplifier circuit or UHF antenna booster circuit can be used to amplify or boost the signal of UHF band from 400 MHz to 850 MHz. This circuit is using only single transistor and provides 15 db amplification. For best results keep all the....
This circuit is useful to detect microwave (gigahertz signal) sources like microwave oven, satellite communication devices, Mobile phones etc. It gives audio visual indications when it detects the Microwaves in the Gigahertz band. Microwave is the form of EM....
This is a low cost, antenna-mounted, this UHF TV pre-amplifier circuit can add more than 25db of gain. The first stage of the pre-amplifier is biased from optimum gain. L1, L2 strip line equivalent with Lambda/8 of PC board. An RF power amplifier is a type....
Barrage (noise) jammer for VHF/UHF communications. Based around an old TV tuner with its local oscillator tapped and amplified. The tuner`s voltage tune line is mixed with a sweeping, random noise signal...
The ATA5760 ATA5761 is a multi-chip PLL receiver device supplied in an SO20 pack- age. It has been especially developed for the demands of RF low-cost data transmission systems with data rates from 1 kBaud to 10 kBaud in Manchester or Bi-phase code. The....