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Frequency_changer   (Site not responding. Last check: 2007-10-13) Frequency changer or frequency converter refers to an electronic device that converts alternating current (AC) of one frequency to alternating current of another frequency. Aside from the obvious aplication of converting bulk amounts of power from one distribution standard to another, frequency changers are also used to control the speed and the torque of the AC motors. Frequency changers are typically used to control the speed of pumps and fans. www.yournursery.com /search.php?title=Frequency_changer   (372 words)

Frequency Changer - General Theory - Science Lobby It is the job of the frequency changer to change the frequency of the selected station to a new, lower, fixed frequency. This frequency changing is done by mixing the radio frequency with the frequency generated by a local oscillator. The output from the mixer is the difference in frequency between the two input frequencies. www.sciencelobby.com /general-theory/frequency-changer.html   (307 words)

History As a result of the number of frequencies in use, the concept of the rotating "frequency changer" was developed early in the last century in order to be able to interconnect systems operating at two different frequencies. These frequency changers were in use until the late 1970s, when the rotary converters were finally retired and the remaining dc load was fed by means of solid-state rectifiers. Meanwhile, a second 20,000-kW frequency changer was installed during the 1940s to operate in parallel with the existing frequency changer. www.ieee.org /organizations/pes/public/2003/sep/peshistory.html   (2288 words)

Radio frequency tuner patent invention The outputs of the first frequency changers are supplied to a second frequency changer which performs downconversion on the output signal of the active first converter to convert a selected channel from one of the distribution networks to a second intermediate frequency. It is also typical for the channel frequency allocation to be substantially identical between the networks such that the channels of one network occupy the same frequencies as the channels of the other network. In general, at least some of the channel frequency allocations occupied in one of the networks will also be occupied in the other of the networks and sufficient isolation must be provided in order to avoid a potentially interfering channel from one network appearing on a selected channel from the other network. www.freshpatents.com /Radio-frequency-tuner-dt20060817ptan20060183447.php   (1232 words)

Frequency changer protection circuit for controlling the acceleration of an electric vehicle - Patent 6717384 A frequency regulator protection circuit for controlling acceleration of electric vehicle comprises a power unit, a display unit, a protection unit, a control unit, a sensor unit, a data processor unit, a trigger unit, a regulator unit, and an output unit. The sensor unit detects whether there is a current overload and delivers a corresponding overload signal to the data processor unit that consequently outputs a frequency change signal to the trigger unit which, in turn, delivers a first regulation signal to the regulator unit. While limiting the outputted power, the frequency is further simultaneously increased, resulting in an increase of the rotation speed of the motor, which assists the electric vehicle in starting and climbing slope. www.freepatentsonline.com /6717384.html   (2501 words)

Radio frequency tuner patent invention A tuner as claimed in claim 1, wherein said second intermediate frequency is the same intermediate frequency for all of said first frequency changers. A tuner as claimed in claim 4, wherein said second intermediate frequency is one of a zero intermediate frequency and a near zero intermediate frequency. A tuner as claimed in claim 1, wherein said first intermediate frequency is the same intermediate frequency for all of said first frequency changers. www.freshpatents.com /Radio-frequency-tuner-dt20060817ptan20060183447.php?type=claims   (470 words)

Freeware Home - Free Software Downloads: Desktop - Cosmetic Tools - Wallpaper Tools This simple utility works with a wallpaper changer to enable wallpaper changing to be propagated to MS VDM. Paper changer is a small application for changing the background wallpaper on the windows desktop from a random selection of JPEG images within a specified folder. Paper Changer can be set to change the wallpaper every time that you start Windows (without remaining loaded) or just used to change the wallpaper whenever you get bored of the current picture. www.freewarehome.com /Desktop/Cosmetic_Tools/Wallpaper_Tools_t.html   (1290 words)

AC/TH1 @ The National Valve Museum The triode is employed as the local oscillator and the hexode for the mixing process, the input signal being coupled to the control grid via the top cap for maximum separation of the circuits. A characteristic of many unsophisticated frequency-changer stages is that the incoming signal, if large, will 'pull' the oscillator frequency slightly off the frequency set by the tuning knob and towards a frequency favourable to the (large) incoming signal. This means that if the radio is tuned slightly to one side of a strong station the local oscillator frequency automatically adjusts to pull in the strong station, ie. www.r-type.org /exhib/aaa0493.htm   (341 words)

Electrical Frequency Changer Offers a Electrical Frequency Changer for Solid-State frequency Changer and Worldwide Supplier of Electrical Conversion Equipment Single and three-phase solid-state systems designed to fill the needs for the conversion of 50 or 60 Hz. Offers a Frequency Changer for Power Converter and Worldwide Supplier of Electrical Conversion Equipment Single and three-phase solid-state systems designed to fill the needs for the conversion of 50 or 60 Hz. Offers a Frequency Converters for Frequency Changer and Worldwide Supplier of Electrical Conversion Equipment Single and three-phase solid-state systems designed to fill the needs for the conversion of 50 or 60 Hz. www.adaptivepower.com /electrical_frequency_changer.htm   (1133 words)

Oliver Machinery Co. - Louis Allis Frequency Changer Aloha, Here is the exotic and interesting Louis Allis Control panel, motor and frequency changer needed for an Oliver direct drive shaper. I order to obtain this speed, a frequency changer is required which generates 120 cycle. Yates American 25-S 1930 catalog frequency changer listed with shapers on page 99. www.owwm.com /PhotoIndex/detail.asp?id=2471   (635 words)

TOSHIBA - Facts Frequency Changer Frequency changer consists of two (2) synchronous machines. The frequency changer connects two (2) power systems with different frequencies and controls the electric power flow between them. TOSHIBA has supplied 60MVA frequency changer to Japan Railway Co. and it has been successfully operated. www.toshiba.co.jp /f-ene/hydro/english/products/facts/changer.htm   (69 words)

Mixer Tutorial & Circuits - Electronic Mixers - General Theory - Hobby Projects One of the new frequencies is the sum of the two inputs, f1 + f2. This is because their frequencies are close enough to beat together. The difference between their frequencies is in the audio range. www.hobbyprojects.com /general_theory/mixer.html   (209 words)

Frequency Changer The number of measurements in an interval of a frequency distribution. The ratio of the number of times an event occurs in a series of trials of a chance experiment to the number of trials of the experiment performed. A device that causes each of a series of audio or audiovisual recordings to be played automatically: a record changer; a compact disk changer. www.jobtrapping.com /help/19530-frequency-changer.html   (498 words)

China Business & Manufacturers Directory > Transmission > Transducer The frequency changer brand as well as the sales network, the automatic control design guide and the technical suppo... The province electric appliance, the frequency changer, the power failure battery, the PEO paper pulp dispersing agen... Frequency changer programmable controller low pressure electric appliance button indicating lamp electrical machiner... www.chinainfo.org /dirs/index.cgi?id=7737&page=0&alphasort=1&sid=   (297 words)

frequency changer   (Site not responding. Last check: 2007-10-13) Visicomm is your source for a broad range of frequency changer instruments or converters from1KVA to 2000KVA in both rotary and solid state designs. The 50hz to 60hz power models are used overseas to test products destined for use in the US or other 60Hz countries and to operate 60hz machinery from a 50hz power utility. The 50/60 hz to 400hz frequency changer is for use in aerospace applications. www.50hz.com /frequency_changer.html   (115 words)

Tucker Product Details It delivers three-phase power using any standard Elgar three-phase oscillator module with an output frequency range of 45Hz to 6KHz. The front panel includes a meter for output voltage monitoring, a voltage amplitude control, and a power switch-circuit breaker that applies line power to the unit. This precision instrument is ideally suited for gyro testing; for testing of equipment for aircraft, missile or shipboard applications; or any equipment requiring frequency conversion or stable ac power. www.tuckerelectronics.net /java/jsp/product_partno1503C_invid16281_condR.htm   (113 words)

Change voice downloads - Wideband Voice Recording Applet SDK, Web Voice Mail, Voice-Warper   (Site not responding. Last check: 2007-10-13) To playback the recorded voice from the server the embedded voice streaming player or a separate player as a voice-streaming applet can be used. This voice changer can even send out belches and drum rolls with a push of a key, mouse or joystick button. Go Voice Changer Software Gold 4.0 is both a voice changing program and a home recording studio. www.vicman.net /lib/change-voice.htm   (1017 words)

AC/TP @ The National Valve Museum Unlike the AC/TH1 the Mazda AC/TP triode-pentode frequency changer was specifically designed to accommodate a limited amount of frequency pulling, but it does provide a reasonable degree of isolation between the signal input grid and the oscillator, necessary to prevent radiation of the oscillations from the set's aerial. The AC/TP was thus a good valve for a cheap, medium-wave, domestic superhet which would only be used on strong local stations and must be as forgiving as possible when tuned in a slapdash manner. Millions of these valves were made and they are as tough as old boots, whereas normally the frequency changer is the Achilles' heel of a radio. www.r-type.org /exhib/aai0134.htm   (220 words)

Spy Emporium Houston Voice Changers san antonio Unitone Televoicer For Fun austin Voice Pretender disguise texas Voice ... Some (RF) Radio Frequency detectors can detect wireless hidden camera because they transmit within the frequencies of 900MGz, 1.2MGz, 2.4GHz and more but they are designed for Tap and bug detections. Wireless cameras transmit 10-1000 feet frequency in reference to the camera transmitter capability. Word of advice: Inasmuch as, you would like to enjoy convenience with wireless camera, you may be giving away your privacy and belongings to electronics hackers who drives around with receivers that can intercept wireless cameras. www.spyemporium.com /faq_gps_vehicle_tracking.html   (3368 words)

Dvd Tuner A tuner is a device toadjust the resonant frequency of an antenna or transmission line to work most efficiently at one frequency or band of frequencies. A tuner is a radio receiver without an amplifier or loudspeaker, which is often constructed forsuperior audio quality in highfidelity applications, as in FM tuner. A tuner is a professional who adjusts the pitch of musical string instruments such as pianos using a tuning fork, or a frequency counter electronic device using a quartz crystal, as a frequencyreference. www.altvetmed.com /face/11148-dvd-tuner.html   (586 words)

cd changer [Archive] - JeepsUnlimited.com Forums 10-31-2003, 11:13 PM That would be an RF(radio frequency changer) It basically broadcasts the cd data in the form of an FM radio signal. you tune your radio to like 88.3 or something unused and pick up the changer as though it was a radio station. That would be an RF(radio frequency changer) It basically broadcasts the cd data in the form of an FM radio signal. www.jeepsunlimited.com /forums/archive/index.php/t-453823.html   (426 words)

Switching Power Supply (SMPS) Design- Tutorials, Circuits, Tools A typical application of a power supply is to convert utility AC voltage into regulated DC voltages required for electronic equipment. Nowadays in most power supplies providing more then a few watts the energy flow is controlled with power semiconductors that are continuously switching on and off with high frequency. In general, SMPS can be classified into four types according to the form of input and output voltages: AC to DC (off-line power supply or a rectifier); DC to DC (voltage converter); AC to AC (frequency changer or cycloconverter); DC to AC (inverter). www.smps.us   (297 words)

Telephone / Mobile / Internet ALL-IN-ONE Voice Changer - Download You speak into the PC microphone and the new voice is heard on your computer speakers, the telephone, cellular, internet chat room, messenger and/or saved on a disk. Its all in one professional voice changer - supporting all communication media types - telephone, mobile and internet. Choose one of endless voices and sound like anyone from a small girl to an old man. For more on computer speech technology and our voice changer software click here. www.triplebit.com   (134 words)

Tucker Product Details Product Specs for California Instruments 161T-PC The 161T-PC Frequency Changer is an AC power source that delivers 160 VA to accommodate a wide variety of applications. Due to the absence of switched power electronics, the unit exhibits a very low level of rms noise on its output. The unit can be furnished with fixed or variable manual oscillators as well as a programmable controller (not included). www.tucker.com /java/jsp/product_partno161T-PC_invid25029_condR.htm   (126 words)

CALIFORNIA_INSTRUMENTS 1001WP The 1001WP Frequency Changer repres   (Site not responding. Last check: 2007-10-13) The 1001WP Frequency Changer represents a new concept to meet the requirements of companies who need to test their products for use from nonstandard power. The portable, conveniently sized unit delivers a continuous 1000 VA. Operating efficiently from a single phase AC outlet, this product puts the convenience of international power at any bench, in the laboratory, the test department, or in the field. The instrument uses a precision sine wave generator which produces a low distortion sine wave at the output. www.testequipmentconnection.com /Models/CALIFORNIA_INSTRUMENTS_1001WP.htm   (121 words)

Freeware and Shareware Downloads: VCD Player, Picture Downloader, Site Monitoring Software, etc We all have a list of web sites that are important to us; sites for the software we use, news sites, blogs, etc. While some of these sites change frequently, others remain static for weeks at a time. There are also many options to control how the images are displayed and how frequently they are changed, as well as the ability to display them as a screen saver using Amaze. There is no limit to the number of sites that can be monitored, including secure sites, and the checking frequency can be anywhere between once a minute and once a day. www.xequte.com /other   (750 words)

Stereos | Radios | Old Car Radios Stereos | Custom Autosound | Kenwood Radio | CD Player | Classic Style | Vintage USA-CD10 CD Changer (for use with the USA-5 & 6, KNW801 & KNW801bk, and Secretaudio radios). Using a separate controller for the CD changer creates the problem of hiding the extra wires and control panel, sometimes not an easy task in a classic vehicle. If you want to keep the classic look of your dash, but demand the great sound that today's modern electronics offer, this is the radio you've been looking for. www.gardenofspeedin.com /products.asp?sub=10   (1039 words)

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