Multi voltage operation v
Listado multi voltage operation v
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Input supply voltage: 110v ~ 250v ac the output voltage:50v-250v(output voltage the maximum output power: w the maximum output current:25a the voltage regulating range:50v-250v ac(output voltage the operation environment temperature:-mm net weight: 42g package include: v 25a ac motor speed controllerpwm ac motor speed control controller w adjustable voltage regulator v specifications: this controller uses novel bi-directional high-power scrthe output voltage is adjusted anywhere between 50v-220v for use with electrical appliancesit can use to such as electric stove, water heater tune thermal, lighting dimmer, small motor speed, electric iron thermostat, and achieve dimming, thermostats, pressure regulator effectit can be very convenient adjust the current up to 25a, and solve the over current problem of the heating wire resistance is too small in the case of cooling causing good100% brand new and high quality
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Module operating voltage compatible 3backup battery is genuine celestial cr, voltage 3v, current 260mah, non-rechargeable batteriesclock operation by am / pm indicator decided to use 24 or 12 hour formatds work to maintain low power consumption data and clock information when power is less than 1mw ds key performance indicators: ¿ real-time clock with energy calculations before seconds, minutes, hours, day, week, month, year capacity, as well as the ability to leap year adjustment ¿ serial i / o ports such a way that a minimum number of pins ¿ wide operating voltage range v ¿ 2features: ds real time clock module dallas ds is the company launched trickle charge the clock chip, which contains a real-time clock / calendar and 31 bytes of static ram, via a simple serial interface to communicate with the microcontrollerpcb single panel, size: 44mm * 23mm * 13v/5v, can be connected with 5v and 3ds between the microcontroller can simply adopt the way synchronous serial communication port only used three lines: (1) rst reset (2) i / o data lines (3) sclk serial clockds is made large 8-pin dip chip, chip below ic socket for easy replacement and swap chips 63cm wiring methods (procedures in order to provide an example, you can access any io port, modify the port definition in the program can be): vcc → +5 v/33v microcontroller 70v, operating current of less than 300na ¿ read / write clock or ram data transfer mode, there are two single-byte and multi-byte transfer mode transmission character set ¿ 8-pin dip package or an optional 8-pin soic surface mount package under ¿ simple 3-wire interface ¿ vcc = 5v and ttl compatible ¿ optional industrial temperature range of -40 to +85 ¿ dual power tubes used for the main power supply and backup power supply ds real time clock module parameters are as follows: 1working temperature: x 2c51 mcu p0 port requires pull-up resistor, if your device does not have a pull-up resistor can be connected to other ports data lines package included: 100% brand new 1/2 x ds module 1/2 x cr batterytheoretical data retention time is more than 10 years! 4vcc and gnd do not reversed, it would burn the chip 2crystal khz, japan imported crystal, matching capacitance 6pf, size 2 * 6mm 5with four positioning holes, diameter 33v gnd → gnd clk → p02 dat → p01 rst → p00 note: 1real-time clock / calendar circuit provides seconds, minutes, hours, days, weeks, months, years of information, the number of days per month and leap year automatically adjust the number of daysclock / ram read / write data in a byte or up to 31 bytes of character set type communication
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B iii utility • cpu voltage adjustable • memory voltage adjustable • imc voltage adjustable • graphic voltage adjustable º supports ejiffy º supports eblu º supports edlu º supports esf form factor º micro-atx size, 244mm*220mm nueva en perfecto estado 1tarjeta madre ecs h77h2-em lga compatible (i3,i5,i7) soporta microsoft windows 10 soporta intel® hd graphics soporta directx® 11 for accelerated blu-ray 3d and divx decoding soporta gui uefi for tweaking bios in graphica interface within a multi language environment soporta hdmi 10 headers support additional 6 usb ports º 1 x clear cmos header º 1 x lpt header º 1 x com header º 1 x chassis intrusion header º 1 x tpm header º 1 x 24-pin atx power supply connector º 1 x 4-pin power connector for vga card º ami bios with 64mb spi flash rom º supports plug and play, str (s3) / std (s4), hardware monitor, multi boot º supports acpi & dmi º audio, lan, can be disabled in bios º f7 hot key for boot up devices option º supports page up clear cmos hotkey º support graphic over-clocking system bios º support dual-monitor function º supports ecs m0 header supports additional 2 usb 3aceptamos mercado pago0 slot º 1 x pci express x1 slot º 2 x pci slots storage º support by intel® h77 • 2 x serial ata 6for windows® 64-bit os with 64-bit cpu, there is no such limitation expansion slot º 1 x pci express x16 gen34a technology (resolution up to x) and hdcp function soporta intel® smart response technology, smart connect technology & rapid start technology esd protection prevent computers from electrostatic discharge damage to enhance its durability and lifespan cpu º lga socket for new 2nd & 3rd generation intel® coreâ„¢ family/ pentium® /celeron® processors º supports intel® turbo boost technology º supports intel® 32nm cpus º dmi 50 ports (compatible with usb 20 ports º 1 x d-sub(vga) º 1 x dvi port º 1 x hdmi port º 1 x rj45 lan connector º 1 x audio port (1x line in, 4x line out, 1x optical spdif out) º 1 x ps/2 keyboard & ps/2 mouse connectors internal i/o connectors & headers º 1 x 4-pin cpu_fan connector º 1 x 3-pin sys_fan connector º 4 x sata 3gb/s connectors º 2 x sata 6gb/s connectors º 1 x front panel switch/led header º 1 x front panel audio header º 1 x usb 30gb/s devices • 4 x serial ata 30gb/s devices • raid0, raid1, raid5, raid 10 configuration audio º realtek alc-ch high definition audio codec º compliant with hd audio specification lan º realtek rtl e gigabit lan rear panel i/o º 2 x usb 3no se hacen entregas personales0gt/s chipset º intel® h77 express chipset memory º dual-channel ddr3 memory architecture º 4 x 240-pin ddr3 dimm socket support up to 32 gb º supports ddr memory speed due to the operating system limitation, the actual memory size may be less than 4gb for the reservation for system usage under windows® bit os0 ports º 3 x usb 2envÃos por domesa 2
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Especificaciones: • output voltage range: 12 to 33 v • output current in excess of 3 a • 01 % line and load regulation • floating operation for high voltages • complete series of protections: current limiting, thermal shutdown and soa control
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Rbuias-rm the rb is a low cost multi port device seriesproduct specifications details product code rbuias-rm cpu nominal frequency 600 mhz sfp ddmi yes cpu core count 1 size of ram 128 mb ethernet ports ethernet ports 5 number of usb ports 1 power jack 1 poe in yes poe out yes supported input voltage 8 v - 30 v voltage monitor yes pcb temperature monitor yes dimensions 214mm x 86mm for pcb operating system routeros tested ambient temperature -35c to +65c license level 5 cpu ar sfp ports 1 usb slot type microusb type ab serial port rj45 storage type nand storage size 128 mb suggested price $ included parts 24v 1sfp cage is also present (sfp module not included!) there is poe output function for port #10 - it can power other poe capable devices with the same voltage as applied to the unittested and recommended to use with mikrotik sfp modules: s-85dlc05d, s-31dlc20d and s-lc20d (not included) routerboard uias-rm comes with 1u rackmount enclosure, lcd panel and power supplythe rb is powered by routeros, a fully featured routing operating system which has been continuously improved for fifteen yearsalso, it has routeros l5 license (instead of l4) and nice touchscreen lcd for configurationrouterboard uias-rm, in comparison with rbl series, not only has five gigabit lan ports and five fast ethernet lan ports, but also has rj45 serial port, microusb port and more ram (128mb instead of 64mb)dynamic routing, hotspot, firewall, mpls, vpn, advanced quality of service, load balancing and bonding, real-time configuration and monitoring - just a few of the vast number of features supported by routerosdesigned for indoor use, and available in many different cases, with a multitude of optionsmaximum load on the port is 500ma2a power adapter ethernet test results rbuias-rm arg&100m all port test mode configuration byte 512 byte 64 byte kpps mbps kpps mbps kpps mbps bridging none (fast path) bridging 25 bridge filter rules routing none (fast path) routing 25 simple queues routing 25 ip filter rules garantÃa: contra defectos de fabricación 30 dias
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5 v typical dual supply voltage ± v maximum dual supply voltage ±15 v typical voltage gain 100 db mounting through hole maximum operating supply voltage ± v typical gain bandwidth product 12@5v@0c to 70c ma typical single supply voltage v minimum dual supply voltage ±11 mhz typical input noise voltage density v nv/rthz maximum input bias current v ua typical slew rate v v/usin linear mode, the input common-mode voltage range includes ground and the output voltage can also swing to ground, even though operated from only a single power supply voltage1 mhz (temperature compensated) very low supply current per channel essentially independent of supply voltage low input bias current: 20 na (temperature compensated) low input offset voltage: 2 mv low input offset current: 2 na input common-mode voltage range includes negative rails differential input voltage range equal to the power supply voltage large output voltage swing 0 v to (vcc+ -1the low-power supply drain is independent of the magnitude of the power supply voltage5 v) see lm158w for enhanced esd ratings technical attributes description value find similar parts operating temperature 0 to 70 °c shut down support no power supply type single|dual rail to rail no minimum single supply voltage 3 v number of channels per chip 2 type general purpose amplifier lead finish matte tin maximum single supply voltage 30 v maximum input offset voltage 7@5v mv minimum cmrr 70 db maximum supply current 1key features related products internally frequency-compensated large dc voltage gain: 100 db wide bandwidth (unity gain): 1piezas originales, nuevas de paquete, nada reciclado, recuperado de chasis, ni usadoapplication areas include transducer amplifiers, dc gain blocks and all the conventional op-amp circuits, which can now be more easily implemented in single power supply systemsprecio unidad bsfor example, these circuits can be directly supplied with the standard +5 v, which is used in logic systems and will easily provide the required interface electronics with no additional power supply******totalmente nuevo******* realice sus preguntas y luego oferte si está seguro! ****************************************** lm358n stmicroelectronics op amp dual gp ±15v/30v 8-pin pdip tube manufacturer part #: lm358n alternate part #: lm358n pdp_pdf_icondatasheet legend rohs compliant legend ncnr lm358n stmicroelectronics, descriptions subs/alternatives these circuits consist of two independent, high-gain, internally frequency-compensated op-amps, specifically designed to operate from a single power supply over a wide range of voltages****************************************** vendo lote de 10 piezas mÃnimo por bs****************************************** ojo: no somos tienda fÃsica, pero si hacemos entregas personalizadas, con previa cita, en lugares públicos y seguro, acepto, transferencias bancarias banco mercantil y banco de venezuela
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5 v typical dual supply voltage ±3|±5|±9|±12 v maximum dual supply voltage ±15 v typical voltage gain 100 db mounting through hole maximum operating supply voltage ±15|30 v typical gain bandwidth product 12@5v@0c to 70c ma typical single supply voltage 5|9|12|15|18|24|28 v minimum dual supply voltage ±1in linear mode, the input common-mode voltage range includes ground and the output voltage can also swing to ground, even though operated from only a single power supply voltage1 mhz (temperature compensated) very low supply current per channel essentially independent of supply voltage low input bias current: 20 na (temperature compensated) low input offset voltage: 2 mv low input offset current: 2 na input common-mode voltage range includes negative rails differential input voltage range equal to the power supply voltage large output voltage swing 0 v to (vcc+ -1the low-power supply drain is independent of the magnitude of the power supply voltage1 mhz typical input noise voltage density 55@30v nv/rthz maximum input bias current 05 v) see lm158w for enhanced esd ratings technical attributes description value find similar parts operating temperature 0 to 70 °c shut down support no power supply type single|dual rail to rail no minimum single supply voltage 3 v number of channels per chip 2 type general purpose amplifier lead finish matte tin maximum single supply voltage 30 v maximum input offset voltage 7@5v mv minimum cmrr 70 db maximum supply current 1key features related products internally frequency-compensated large dc voltage gain: 100 db wide bandwidth (unity gain): 1******totalmente nuevo******* realice sus preguntas y luego oferte si está seguro, no me haga perder mi tiempo! ****************************************** lm358n stmicroelectronics op amp dual gp ±15v/30v 8-pin pdip tube manufacturer part #: lm358n alternate part #: lm358n pdp_pdf_icondatasheet legend rohs compliant legend ncnr lm358n stmicroelectronics, descriptions subs/alternatives these circuits consist of two independent, high-gain, internally frequency-compensated op-amps, specifically designed to operate from a single power supply over a wide range of voltages****************************************** vendo minimo 20 piezas por $ 15 vendo minimo 20 piezas por $ 15 vendo minimo 20 piezas por $ 15 vendo minimo 20 piezas por $ 15 vendo minimo 20 piezas por $ 15 ****************************************** ****************************************** necesitas pocas piezas? te vendo un par (02) piezas por $3 solo x aqui 14_ochocerosiete cincounoochosiete ****************************************** producto nuevo - producto nuevo - producto nuevo producto nuevo - producto nuevo - producto nuevo producto nuevo - producto nuevo - producto nuevo producto nuevo - producto nuevo - producto nuevo producto nuevo - producto nuevo - producto nuevo producto nuevo - producto nuevo - producto nuevo producto nuevo - producto nuevo - producto nuevo producto nuevo - producto nuevo - producto nuevo producto nuevo - producto nuevo - producto nuevo producto nuevo - producto nuevo - producto nuevo producto nuevo - producto nuevo - producto nuevo ojo: * no somos tienda fÃsica, pero si hacemos entregas personalizadas, con previa cita, en lugares públicos y seguroapplication areas include transducer amplifiers, dc gain blocks and all the conventional op-amp circuits, which can now be more easily implemented in single power supply systemsfor example, these circuits can be directly supplied with the standard +5 v, which is used in logic systems and will easily provide the required interface electronics with no additional power supplymunicipal - ptola cruz) * acepto transferencias bancarias mercantil, venezuela, banesco y bicentenario * acepto t - pago piezas originales, nuevas de paquete de la marca: st microelectronic15@5v ua typical slew rate 0
Puerto la Cruz (Anzoátegui)
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Especificaciones: • output voltage range: 12 to 37 v • output current in excess of 11 % line and load regulation • floating operation for high voltages • complete series of protections: current limiting, thermal shutdown and soa control
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"somos importadores directos" pnp power transistors, toshiba bipolar transistors, toshiba specifications attribute value transistor type pnp maximum dc collector current 15 a maximum collector emitter voltage 230 v package type to-3pl mounting type through hole maximum power dissipation 150 w minimum dc current gain 35 transistor configuration single maximum collector base voltage -230 v maximum emitter base voltage -5 v maximum operating frequency 30 mhz pin count 3 number of elements per chip 1 width 52 x 26mm height 26mm maximum operating temperature +150 °c maximum collector emitter saturation voltage -3 v ojo: oferte solo si está seguro que va a realizar el pedidoevite ser calificado como negativo5mm dimensions 20tiene 1 dÃa para concretar su compra para garantizar precio, en caso de no concretar la compra la misma se cancelara y se le calificara negativorecuerde que ofertar es un compromiso de compra
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1 % line and load regulation • floating operation for high voltages • complete series of protections: current limiting, thermal shutdown and soa controlespecificaciones: • output voltage: 18v • output current in excess of 1
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5 v @ 1a      temperatura máxima de funcionamiento: 150 c      temperatura de funcionamiento mÃnima: 0 c      estilo de montaje: agujero pasante l lm voltage regulator +5v 15 a line regulation: 50 mv load regulation: 100 mv dropout voltage (max): 25a 100% brand new! package / case: to-220 output type: fixed output voltage: 5 v output current: 15 v @ 1a maximum operating temperature: 150 c minimum operating temperature: 0 c mounting style: through hole5a ¡100% nuevo! paquete / caja: to-220 tipo de salida: fijo     voltaje de salida: 5 v     corriente de salida: 1l lm transistor/ regulador de voltaje + 5v 15 a      regulación de lÃnea: 50 mv      regulación de carga: 100 mv      voltaje de deserción (máx
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Especificacion tip41c y tip 42c (transistores complementarios) vcbo collector-base voltage (ie = v vceo collector-emitter voltage (ib = v vebo emitte-base voltage (ic = 0) 5 v ic collector current 6 a icm collector peak current (tp ib base current 3 a ptot total dissipation at tcase = 25°c 65 w tstg storage temperature -65 to 150 °c tj maxoperating junction temperature 150 °c
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"somos importadores directos" characteristics of the 2sb688 bipolar transistor type - p-n-p collector-emitter voltage: -120 v collector-base voltage: -120 v emitter-base voltage: -5 v collector current: -8 a collector dissipation - 80 w dc current gain (hfe) - 55 to 160 transition frequency - 12 mhz operating and storage junction temperature range -55 to +150 °c package - to-3p ojo: oferte solo si está seguro que va a realizar el pedidotiene 1 dÃa para concretar su compra para garantizar precio, en caso de no concretar la compra la misma se cancelara y se le calificara negativorecuerde que ofertar es un compromiso de compraevite ser calificado como negativo
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0 keyboard layout full-sized qwerty layout detection rate 350 characters per minute operating surface most flat, opaque surface battery operation approxe teclado de proyeccion laser magic cube y multi touch mouse marca celluon english qwerty keyboard layout non-mechanical optical mechanism for superior durability built-in lithium polymer rechargeable battery for mobility and convenience compatible with ios 4 and later, mac os 10 and later, android 20 and later, 2 windows xp/vista/7/8, 3 and any bluetooth hid and usb devices interface bluetooth hid / usb2150 minutes, 700mah para mayor informacion ver el video *horario de atención al público: de lunes a viernes de 9:00 am - pm (mañana) y de 2 pm - 5:30 pm (tarde)2 and later, windows xp/vista/7 and later, and any device with bluetooth hid support a full-sized keyboard layout with multi-touch mouse capability works on most flat, opaque surface easy connection via bluetooth or usb especificaciones tecnicas specifications compatibility devices 1 ios4 and later, mac os x, android 4estamos ubicados en los dos caminos
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***** descripción del producto ***** [multi functions and widely applicable] electrical volt amp ohm hz meter, for ac dc voltage current resistance diode continuity capacitance frequency***** titulo completo ***** auto ranging digital multimeter ac dc voltage current tester resistance diode meter trms counts live line detector continuity capacitance frequency lcd backlight display ncv ammeter voltmeter3 samples per secenviamos a cualquier parte del paÃs***** condiciones ***** 1tiempo de entrega de 3 a 5 dÃas hábiles
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v input voltage sensitivity 0we designed the m4a to produce massive output with real world input voltage levelswarning: the m4a is designed to work off real world input voltage levels (v), but you’ll still need an upgraded charging system to realize the true potential of this beastso play it loud, but play it safethe m4a is based on the circuitry of our world renowned z2-lv amps, and features a 6 transformer power supplyat maximum output level the m4a can require over amps of sustained/stable currentfailure to provide a stable power supply to the amp at the desired output level will often result in amplifier failure15v - 5v power wire guage in 2 x 0 awg speaker wire gauge out 10 awg dimensions: in " x 95" dimensions: mm x x 6this amp can deliver over watts rms at 12v, over watts rms at alternator charging levels, and has a dynamic power rating of over watts! to make the m4a even sweeter our m class heatsink enables the m4a to have one of the smallest footprints in its power class while maintaining maximum heat dissipationif you’re ready to take your system to the next level then the m4a is the tool for youthis type of failure is not covered under warrantythis makes installing one, or more of these monster amps as easy as possiblespecs channels 1 cont wattage @ 1ohm w x 1ch @ 12v, w x 1ch @ 1435 cm shipping weight - lbs 37 lbs / kg
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5 v corriente de retención máxima ih: 25 ma el estado rms ti actual (rms): 12 a temperatura de funcionamiento máxima: 125 ° c pico puerta de energÃa: 1 w repetitive peak off-state voltage: 600 v isolation voltage (viso = v ac) general encapsulado: to-220 node forma coloquial podrÃa decirse que el triac es un interruptor capaz de conmutar la corriente alternaun triac  o triodo para corriente alterna  es un dispositivo semiconductor, de la familia de los transistores especificaciones disparo de la puerta actual max (qi), igt: 25 ma disparo de puerta tensión max vgt: 1la diferencia con un tiristor convencional es que éste es unidireccional y el triac es bidireccional
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Contra: operation c, en excelente estado, una joya que no necesita presentación, la primera aventura portátil de contra! hagan todas sus preguntas antes de ofertar, el precio es negociable, también tengo el metal gear solid y contra: the alien wars de game boy color y otros juegos de colección! acepto depositos, transferencia bancarias o pago movilno hago entregas personales, realizo envios unicamente a través de tealca, cobro a destino
Girardot-Aragua (Aragua)
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Controlador de carga solar de 20 amp de 12 y 24 v nuevo specifications positive grounded  nominal system voltage: 12v/24v auto recognition maxpv input power: 400w (12v), 800w (24v) rated charge current: 20a maxcompensation: -30mv/°c (12v), -60mv/°c (24v) terminals: 10awg 25% current overload: 1 minute solar input voltage: 42v rated load current: 20a self-consumption: operating temperature: -35°c to + 55°c temp
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Highly sensitive non-contact switch, brushless dc motors, brushless dc fan limit parameter (25 ¡æ) power supply voltage vcc: v output current io: 25ma storage temperature range ts: - ¡æ sku: nf/0h41/sh41/ss41f/s41 bipolar hall element hall sensor features: highly sensitive non-contact switch, brushless dc motors, brushless dc fan limit parameter (25 ¡æ) power supply voltage vcc: v output current io: 25ma operating ambient temperature ta: - ¡æ storage temperature range ts: - ¡æ nota: una vez realizada la compra cuenta con dos dÃas para realizar el pago, de lo contrario será calificado según sea el caso
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Ac voltage: 600v, v dc voltage: 600v, v ac current: 400a, a resistencia: ko, mo capacitancia: 100nf, nf, uf, uf, ufpinza amperimetrica amprobe acd-15 trms-pro
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Package: to-220 drain-to-source breakdown voltage: 400 v gate-to-source breakdown voltage: +/- 20 v continuous drain current: 10 a (with adequate heat sinking, consider our to-220 heat sink set) minimum operating temperature: -55°c maximum operating temperature: 150°c pin spacing pitch: 21in) hole diameter: 315in) weight: 2g (0cuenta con 2 dÃas hábiles para concretar la compra de los contrario se cerrara la venta y será calificado neutro o negativo según sea el casoenviamos por la empresa de encomiendas de su preferencia y debe notificarnos si desea que su envió viaje asegurado para que sea reembolsado el monto de la compra o el monto asegurado en caso de algún siniestro07oz) ***su compra es un compromiso para nosotrosla mercancÃa viaja a riesgo y cuenta del cliente sin embargo realizamos todas las gestiones necesarias para solventar cualquier situación con la empresa de encomiendas que usted haya seleccionado***
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Bombillo ahorrador triple u: potencia: 18w luz blanca vida util: horas temperatura del color: °k frecuencia: 60hz voltage: 110 v rosca: e27 iso bombillo led de ultima generacion 5w} potencia: 5w luz blanca vida util: horas temperatura del color: °k frecuencia: 60hz voltage: 110 v rosca: e27 iso se acepta mercado pago se hacen entregas personales en san cristobal, estado tachiraestamos para servirles!
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vendo modulo rectificador modelo rt4b 24v/50a nuevo solo se saco de caja pero nunca usado modelo:rt4b-24v/50a rated voltage: 220v rated voltage tolerance: v rated frecuency range: hz rated current: 11a maxoutput power: w maxoutput current: 52adc maxoutput voltage: 30vdc max
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Top245 top245yn 245yn top245y to-220 original ************************************************************************************************************************************************************* manufacturer: power integrations product category: ac/dc converters rohs: details mounting style: through hole package / case: to-220 output voltage: 12 v input / supply voltage - min: 85 vac input / supply voltage - max: 265 vac switching frequency: 132 khz duty cycle - max: 83 % operating supply current: 16 ma minimum operating temperature: - 40 c maximum operating temperature: + 150 c series: top245 packaging: tube type: off line switcher brand: power integrations tradename: topswitch unit weight: g ---------------------------------------------------------------------------------------------------------------- los envios normalmente se hacen a pocas horas de concretar el pago si es antes de las pm, en algunos casos podria tomar hasta 48 horas, pueden retrasarse por problemas en las oficinas de mensajeria
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250 v ce aprobar la extensión toma de corriente número de modelo qm-a42 marca qiaoming voltaje de la tarifa 250 v corriente de la tarifa 10a potencia máxima w el color cuerpo blanco con superficie azul el interruptor interruptor principal luz indicadora sà numero de tomas 10 multi enchufe protección de sobrecarga: afirmativa garantÃa: 30 dias
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250 v ce aprobar la extensión toma de corriente número de modelo qm-a42 marca qiaoming voltaje de la tarifa 250 v corriente de la tarifa 10a potencia máxima w el color cuerpo blanco con superficie azul el interruptor interruptor principal luz indicadora sà numero de tomas 10 multi enchufe protección de sobrecarga: afirmativa