This audio-video circuit provides you with wireless audio and visual transmission to a TV. The TV acts as a receiver, eliminating the need to buy a separate monitor. You can also hook it up to a VCR or CCD Camera, and even set up a remote CCTV security....

Another version of the 1W VHF amplifier for the FM transceiver, well, in fact, it`s still the same version since I didn`t managed to get 1W. YET! Today I made some tests with a 2n2553 and a 2n2866. it melted solder in one of the base resistors (never I had....

This is a very simple circuit of UHF band TV antenna booster with 15dB gain power. This low cost antenna booster is simple and easy to build. This ....

A homebrew 2M transceiver I wanted to use it mobile so I wouldn`t have been able to use a fist mike. I had the bright idea of using one of those cheap personal hands free kits you can buy for mobile phones, however once installed reality struck home - hardly....

This is a detailed explanation of a procedure you can use to modify a UHF MICOR "M" range (450-470 MHz) receiver board so it operates adequately in the 435-450 MHz range. This is an enhancement to Kevin`s text-only article. These receivers are commonly found....

These Intersil RS-485/RS-422 devices are BiCMOS 3. 3V 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% tolerance supplies (3V to 3.....

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As I was developing my IR Extender Circuit, I needed to find a way of measuring the relative intensities of different Infra red light sources. This circuit is the result of my research. I have used a photodiode, SFH2030 as an infra red sensor. A MOSFET....

Function: for driving small UHF TV transmitters, with gain is 7dB and can amplify a signal between 470-860 MHz. Component: Resistor, Capacitor, Transistor, ....

The elements diameter of the antenna may vary between 5. 8mm and the dipole diameter may vary between 8. 12mm (12mm recommended) without the need of changing anything to the length or spacing. All elements except the dipole are electrically connected to the....

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The receiver is a tripple superheterodyne receiver with two PLL-guided local oscillators. The first LO (2. 1 GHz) can be set in steps of 500kHz and sets the RX signal down to 188 - 188. 5 MHz. It has a high PLL loop bandwidth of around 20kHz, therefore gives....

Using the UPC1651 FM monolithic circuit can be designed a very simple low cost FM transmitter electronic project. This UPC1651 FM transmitter circuit is specially designed as a wide band amplifier covering the HF band trough UHF band. Audio signal from the....

This is a 35.3 to 10.7 MHz converter circuit. It converts the 35.3 MHz signal coming from a VHF/UHF tuner down to an FM tuner to decode the TV audio in FM....

This circuit can be designed to attenuate signal frequency. Customizable from 1 to 40 dB. If you want to use the band uhf, should be fitted within the frame shield, and C1 to C3 type feeds true. The line should be as short as possible, and the diode should....

A typical, low cost, FSK Modulator TA0038 is implemented by injecting the modulation voltage into the phase lock loop of the Carrier synthesizer. This is done in two ways, by summing the modulation voltage and the loop error voltage together and applying....

This PIN diode rf switch is the ideal antenna switch for VHF and UHF and work with the PIN diodes which are special high frequency switching diodes with ve....

In contrast to traditional small-signal approaches, the use of large-signal, time-domain design techniques helps deliver low-noise grounded-base oscillators for VHF/UHF applications....

Previously, an article was posted on how to connect to the Raspberry PI board from a Linux PC using the serial port. We now look at how to do the same thing using a Windows PC. In this article, a Windows 8 PC is connected to the Raspberry PI through a USB to....

Here`s a design circuit for very simple low cost and ultra compact VHF UHF Low-Noise amplifiers circuit can be designed using the MAX2664 and MAX2665 ultra-compact LNAs for VHF/UHF applications. These devices incorporate a broadband LNA with an integrated....

This Wideband DTV UHF Antenna TV Amplifier has a total gain of 10 to 15 dB in the 400 850 MHz domain frequency....

Accessories built so far include a linear power supply, a switchmode power supply, a tuning aid, and a headset. An antenna tuner and SWR meter will be described later. In order to operate the new transceiver, I needed a power supply. I began by building a....

A very simple and efficiency active antenna electronic project can be designed using this electronic schematic circuit that is based on transistors. This active antenna electronic project is useful for a wide range of RF frequencies covering three RF bands....

The Intersil ISL43485 is a high speed BiCMOS 3. 3V powered, single transceiver that meets both the RS-485 and RS-422 standards for balanced communication. Unlike some competitive devices, this Intersil transceiver is specified for 10% tolerance supplies (3V....

Combine an inexpensive transceiver, some free software and you`re on PSK31 at a rock-bottom price! Add to that the fun and pride of building the transceiver and you`ve got a n irresistible package! I is a relatively new I digital mode, created Iby Peter....

Many versions of VCXO`s this is the final version I have decide to use in all VCXO`s in the Future, it is extremely universal at all Freq. up to 7th Ovetone XTAL`s that can be used in VCXO. NOTE: On this CPLD PLL Board I am using a second Phase Lock....

The UHF motion detector below operates on the Doppler radar principle. A radial signal is created by the oscillator (Q1). Some of this energy is reflected back....

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In this instructable I use an example of interfacing an Arduino to an ARINC 429 transceiver in order to demonstrate the general process of interfacing an Arduino to electronic circuits so you can use these techniques on your own designs. An ARINC 429 bus is....

Voltage to frequency is very useful in many situation, such as transmitting temperature measurement using standard voice radio transceiver. This circuit (see the circuit`s schematic diagram) uses only two CA3130 op-amps, but the performance is good enough.....

MC44BS374CA: PLL Tuned UHF and VHF Audio Video High Integration Modulator MC44BS374CA The MC44BS374CA Audio and Video Modulator is for use in VCRs, set-top boxes, and similar devices. By Freescale Semiconductor, Inc ..