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Topic: Ring circuit

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	Telephone ringing circuits
		Another apprach for ring detecting is to use a full wave rectifier circuit to convert the AC sign signal to the DC suitable for optoisolator and then put current limiting resistor and zener diode to the rectifier output.
		Ring detector must work on ring signal which is 44-58V DC summed with 25+-3Hz AC ring signal in voltage range 35-75 V. The feeding resistance for ring generator is 800-1710 Hz.
		Ring detector must not detect ring signal which is 44-58V DC summed with 20-3400 Hz AC ring signal which is less than 10 V. The feeding resistance for ring generator is 800-1710 Hz.
	www.epanorama.net /circuits/telephone_ringer.html (3304 words)

	Pulse width modulation circuit - Patent 5119045
		A pulse width modulation circuit according to claim 1, wherein said phase shift circuit comprises a delay circuit which is composed of the same delay elements as said oscillator and applied with the same control voltage as said oscillator.
		A pulse width modulation circuit according to claim 1, wherein said phase shift circuit comprises a barrel shifter to which the outputs of said oscillator are input, said barrel shifter shifting the phase of said outputs from said oscillator by a step in response to the output of said tap selection circuit.
		To the circuit 20 is input a DET signal which is generated independently from signals from the delay elements and not synchronized with the delay signals.
	www.freepatentsonline.com /5119045.html (4872 words)

	Integral water-cooled circuit ring/bus bar assembly for high frequency generators - Patent 5055729
		The circuit ring is fabricated from hollow copper tubing of a rectangular cross-section and of a size which will allow electrical circuit leads to be brazed thereto in such a manner as to avoid damage to insulation.
		A further advantage of this invention is that of fabricating circuit ring-bus bar assemblies in such a manner as to combine the functions of the circuit ring and bus bars into a single assembly, thus eliminating a hydraulic-electrical joint.
		Such additional space permits the circuit lead connector to be brazed rather than bolted to the circuit ring and additionally makes it possible to reduce the height of the insulation between circuit rings, thus spacing the insulation from the joint and allowing brazing to occur.
	www.freepatentsonline.com /5055729.html (3384 words)

	Ring modulation - Wikipedia, the free encyclopedia
		Ring modulation is an effect in electronics, related to amplitude modulation or frequency mixing, performed by multiplying two audio signals, where one is typically a sine-wave or another simple waveform.
		It is referred to as "ring" modulation because the analog circuit of diodes originally used to implement this effect took the shape of a ring.
		Ring modulators were used by the BBC Radiophonic Workshop to produce the distinctive voice of the Daleks in the television series Doctor Who.
	en.wikipedia.org /wiki/Ring_modulator (752 words)

	Electrics > Extending a ring circuit using junction boxes
		The best way of using junction boxes to extend a ring circuit, is to find the length of cable between the two sockets on the existing ring closest to the desired extension area.
		The new cable runs round the room which you have extended the ring circuit to reach, looping out at points where you sockets are required - which can be cut into and added after the new section of the circuit has been tested - see Installing a power socket.
		The digram on the left is an example of an existing ring circuit, and the diagram on the right shows the new part of the ring circuit in orange joined to the old ring circuit with junction boxes.
	www.diynot.com /pages/el/el014.php (681 words)

	RING MAIN INSTALLATION AND TESTING
		Before working on any electrical circuit isolate the supply by switching off the main switch and remove the fuse to the circuit that you are working on, If it is a circuit breaker switch off the main fuse and circuit breaker and remove the wires from the top of the circuit breaker.
		The ring circuit or ring main as it is often called starts at the consumer unit and returns to the consumer unit.
		In theory each socket on the ring circuit could supply a spur to a single or double socket or FCU as long as the area is less than 120 square yards and the total load is less than 7200 Watts.
	www.ultimatehandyman.co.uk /ring_main.htm (849 words)

	Electrics > Converting a radial circuit to ring circuits
		The principle of the radial circuit, is that the mains cable leaves the consumer unit and passes through each socket until it reaches and ends at the last socket.
		Alternatively, on a ring circuit the mains cable leaves the consumer unit passes through every socket and then returns to the consumer unit.
		The advantage of the ring circuit is that electricity can reach the sockets from two directions and so reduces the load on the cable.
	www.diynot.com /pages/el/el016.php (888 words)

	TROUBLESHOOTING (Site not responding. Last check: 2007-10-13)
		For continuity testing of the “ring” circuit, follow the same procedure as above, except connect one of the meter leads to the “ring” contact of the inserted plug for continuity, then the blue and clear color-coded pin terminals for shorts.
		Reinstall the color-coded pin terminals in the same sequence as removed (be careful to install the blue color-coded pin terminal to the blue color-coded pin terminal of the stator cable, followed by white to white and clear to clear).
		For continuity testing of the “ring” circuit, follow the same procedure as above except connect one of the meter leads to the “ring” terminal of the inserted plug and the other meter lead to the “ring” segment of the stator cable plug.
	www.marquen.com /troubleshooting_page.htm (1310 words)

	What's new
		Our slip ring engineers can offer their years of expertise to you as you decide which approach is better for your design.
		It resembles a miniature slip ring assembly in size and appearance and provides a self-contained, no-sliding contact rotary interface using flexible circuit tapes for those applications where continuous rotation is not required.
		A pancake slip ring usually has: greater weight and volume for the same circuits, greater capacitance and crosstalk, greater brush wear and more readily collects wear debris on its vertical axis.
	www.polysci.com /SlipRings/srfaq.htm (828 words)

	Cisco - Creating a Circuit for Monitoring the Ring
		The circuit starts on the transmit leg of a port on either a DS1 or DS3 board and traverses the ring.
		A local one-way (unidirectional) circuit is temporarily created between the two ports (Port 1 live traffic) to (Port 2 Monitor Circuit) to test the connectivity and signal performance.
		The circuit is ready to be used to monitor the ring.
	www.cisco.com /warp/public/127/ONS_15454/mon_ring.html (1451 words)

	Nanning Undertakes Network Redesign and Upgrade
		Circuit breakers and secondary protection systems are not used, thus improving the network with a modest increase in equipment costs.
		Multi-ring circuits on the underground cable system that operate closed with the benefit of unit protection to isolate a faulty section in the event of a fault.
		In general, ring main units are not fitted with remote-control devices and, in view of the large number currently in service, the cost to provide these facilities would be prohibitive for the marginal improvement in overall system reliability.
	tdworld.com /mag/power_nanning_undertakes_network (1681 words)

	Lab 10
		A ring oscillator is a cascade of an odd number of inverters with the final invert output fed back to the input of the first inverter.
		Use the remaining inverter as a buffer between the ring oscillator and the instrumentation (frequency counter on the oscilloscope).
		That is, select one of the inverter outputs from the ring oscillator, and apply this to the input of the sixth inverter.
	www.rose-hulman.edu /Class/ee/doering/ece333/lab_10.htm (981 words)

	Wiring A Ring Main UK : Diy Hints, Tips & Advice : Diy Doctor
		It is a ring of wires, circling your home, carrying the mains electricity to sockets on the way.
		As both ends of the ring are connected to the same terminals at the consumer unit, the current runs in both directions imposing less of a load on the cables.
		An average house has a footprint of about 64-70 square meters so this allows for the continuation of the ring into a porch or garage etc. The ring main must be protected by a 30amp fuse if it is on a cartridge fuse board, or a 32amp MCB fuse.
	www.diydoctor.org.uk /projects/ringmain.htm (766 words)

	Tubular Slip Ring Assemblies \| Michigan Scientific Corporation
		Thin, weatherproof 4 circuit slip ring assembly designed to fit on shafts up to 2" in diameter.
		Compact, weatherproof 6 circuit slip ring assembly designed to fit on shafts up to 2" in diameter.
		Compact, weatherproof 6 circuit slip ring assembly designed to fit on shafts up to 3.2" in diameter.
	www.michsci.com /Products/sliprings/tubular/tubular.htm (170 words)

	Biological Cybernetics '97 abstract (Site not responding. Last check: 2007-10-13)
		Phase response characteristics of model neurons determine which patterns are expressed in a ring circuit model of gait generation.
		In order to assess the relative contributions to pattern-generation of the intrinsic properties of individual neurons and of their connectivity, we examined a ring circuit composed of four complex physiologically based oscillators.
		PRCs that have a complex shape enable a circuit to produce a wider variety of patterns, and since complex neurons tend to have complex PRCs, enriching the repertoire of patterns exhibited by a circuit may be the function of some intrinsic neuronal complexity.
	people.csail.mit.edu /rondror/abstracts/canavier_biocyb_97.htm (302 words)

	ring generator circuit
		Telephonic Rings is generated by a signal of 50-80 VRms, 25 to 50Hz.
		Easy way to do it, is using a AC transformer from line power to your circuit, just let a secundary of your power source with 70 Vrms AC 50Hz.
		Ring circuit in most telephones is a.47uF capacitor in series with 4K7 resistor.
	www.edaboard.com /ftopic56685.html (178 words)

	MAP/5PV4 Configuration
		Circuit cards are placed in the slots provided by the motherboard in the MAP/5PV4.
		Assign an ACCX circuit card, if provided, to the highest numbered available slot after all tip/ring circuit cards are installed.
		Assign the multi-port serial circuit card or super serial circuit card, if provided, to the lowest-numbered ISA slot after the switch interface circuit card, if any, is installed.
	support.avaya.com /elmodocs2/intuity/Iar51/m5v4pcfg.htm (981 words)

	Slip Ring Union Products for air, hydraulic, steam, water, and coolants.
		Slip rings are used for power, signal and data transfer and are readily available in 6,12,18,24 and 36 circuits.
		The custom rotary union assembly shown is a stock 2 passage rotary union to pass air with an integrated electrical slip ring rated for high amperage/voltage power circuits to run a motor.
		This slip ring is designed into our unions to allow for continuous 360 degree rotation of electrical power, signal and data transfer.
	www.rotarysystems.com /slipring.htm (339 words)

	Publisher description for Library of Congress control number 95038581 (Site not responding. Last check: 2007-10-13)
		Microwave ring circuits are remarkably simple in design and their performance is usually easy to predict.
		Microwave Ring Circuits and Antennas provides the first fully dedicated treatment of ring circuits, with the aims of promoting a greater understanding of their design and operation and stimulating further applications.
		Microwave Ring Circuits and Antennas begins with a general introduction to the ring circuit, its history, as well as its past and present applications.
	www.loc.gov /catdir/description/wiley033/95038581.html (556 words)

	Wizard's Circuits
		These are the selected Wizard's Tool Box Circuits™ circuits that have proven most useful to telephone, electronic, and home automation technicians over the last 20 years.
		The circuit is transparent to all AC frequencies above 15hz.
		Because of its small size and ability to be line powered this circuit still comes in handy even in a digitally dominated environment.
	www.thecreativeaspect.com /WTB.htm (540 words)

	Let Freedom Ring » Ninth Circuit (Site not responding. Last check: 2007-10-13)
		You know, obviously, the ACLU was “judge shopping.” Five of the 11 Court of Appeals circuits in the country have already ruled that there is a national security exception, or an intelligence exception to the fourth amendment rule that would require a warranty before wiretapping.
		I mean, the second, the ninth circuit, the most liberal in the country said foreign security wiretaps are a recognized exception to the general warrant requirement.
		If so, the addition of Alito enabled the court to prevent the 9th Circuit’s approach from pulling the nation’s courts even more deeply than they already are into supervising American life.
	www.letfreedomringblog.com /category/ninth-circuit (1452 words)

	Telephone Electronic Circuits, Page 6
		Telephone line based audio muting and light on circuit #2: Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus miss an important incoming phone call.
		The circuit would automatically light a bulb on arrival of a telephone ring and simultaneously mute the music system/TV audio for the duration the telephone handset is off-hook.
		Telephone Record Control #2: This circuit will allow you to connect any tape recorder that has a mic and remote input to a phone line and automatically record both sides of a conversation when ever the phone is in use.
	www.discovercircuits.com /T/telephone5.htm (3136 words)

	Wiring A Radial Circuit
		A radial circuit is a mains power circuit found in some homes to feed sockets and lighting points.
		Lighting circuits are dealt with in a separate project.
		There is no limit to the number of sockets used on a radial circuit and, just like a ring main, spurs, or extra sockets, can be added.
	www.diydoctor.org.uk /projects/radialcircuit.htm (241 words)

	Three Ring Circuit (Site not responding. Last check: 2007-10-13)
		While most students in the class were designing and building Greastest Common Denominator calculators, I made the Three Ring Circuit, instead.
		This circuit is obviously related to my other so-called "pun" pieces, in that it was inspired by the language of technology, and meant to intervene between large scale human gesture and the microscopic world of computer circuitry.
		You select a pattern for the first ring by pushing buttons, the second ring displays the inverted pattern, and the 3rd is the XOR of side by side lights.
	www.visualmusic.org /Biography/3Ring.htm (182 words)

	Ring circuits again! - ECN Electrical Forum
		A ring circuit may supply an unlimited number of sockets, in a maximum floor area of 100 sq M, providing that the known or estimated load does not exceed the value of the MCB.
		The upper-floor ring is seldom loaded to more than a very small fraction of its capacity, especially now that central heating is widespread and thus the need even for portable heaters in bedrooms has diminished.
		If somebody installs a separate ring for the kitchen area, we still have all the major appliances on the one ring while the other two rings are feeding a TV and an electric blanket.
	electrical-contractor.net /ubb/Forum9/HTML/000091.html (6563 words)

	Passive Ring Modulator (Site not responding. Last check: 2007-10-13)
		A ring modulator accepts two inputs and produces the sum and difference frequencies of them.
		Ring modulators offer a convenient way to create metallic sounds, bells and klangs.
		This Ring Modulator design is very old and unique.
	www.synthfool.com /ringmod.html (137 words)

	Ring detector circuit (Henry Spencer) (Site not responding. Last check: 2007-10-13)
		The 0.1 capacitor between the internal node and the output acts as an integrator, so that the AC ringing shows up as one pulse rather than a sequence of short ones.
		This circuit isn't particularly fussy about power voltage, although you might want to increase some of the resistor values on the output side for higher voltages.
		The 6N139 is a premium opto and will cost a few bucks, but overall it's not what you'd call an expensive circuit, given the logic-level output and the high degree of isolation from the phone line.
	yarchive.net /phone/ring_detector.html (543 words)

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