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Bergquist's proprietary HeatSeal® membrane switches are custom engineered for use in environments where reliability is critical. The HeatSeal process thermally bonds switch layers together, providing a seal that is impervious to moisture, temperature extremes and cleaning chemicals. Options include screened silver ink or PC board circuitry, tactile graphics, rim or pillow embossing, deadfront or translucent windows and more.
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APEM professional membrane switch panels
- Custom designed front panels
- Sealed, easy to clean
- Tactile feedback by snap dome or embossing
- Many options available: texture varnish, integrated components, prominent shapes, changeable legends, reinforced sealing…
Applications: instrumentation, medical, time management, weighing systems, vending machines, access control…
APEM, the broadest offering in the switch market: miniature switches, industrial switches, LED indicators, professional switch panels and professional joysticks.
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Customised membrane keyboards
- Extremly flat profile (> 1mm)
- With or without tactile feedback/snap-action disc
- Integral LEDs/displays
Customised low profile keyboards with RAFI short-travel keyswitches RACON 8/12 on RF15/19 in front panel under an overlay
- Good tactile feedback (click)
- Fully illuminated/spot illuminated
- Integration of displays and electronic compoments
- Integration of RAFI KN 19 main switches (250V / 4A) under an overlay
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Short-travel systems with overlay or keycaps
Keyboards made up of RAFI short travel keyswitches MICON 5, RACON 8/12 or RF 15/19 under overlay or under keycaps.
Advantages
* very good tactility (click)
* fully illuminated
* combination with displays and other components on one PCB
* combination with short travel main switch KN 19, max. 250 V / 4A
* combination with control unit RAFIX 22 FS on one PCB
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A membrane switch generally consists of two polyester films that are screen printed with conductive ink to form the circuit layers of the switch. A spacer, which is die cut at contact points, is then sandwiched between two circuits. The die-cut holes permit a touch of the finger to close the contact, which in turn completes the circuit. Upon release, the circuit is broken.
A graphic overlay is added to the membrane switch to allow the input device user to identify specific switch contacts.
The panel back is laminated with an adhesive for mounting to a backer or enclosure and is terminated with a means for interfacing with the customer’s electronics.
Tactile feedback in a membrane switch is actually an enhancement, which provides the user feedback when they press the key location. Typically, the switch consists of a top and bottom layer of polyester with a tactile actuator that when pressed, momentarily completes the circuit while providing the user a degree of response based on the switches construction.
Non-tactile membrane switches rely on a sensory response other then tactile touch, such as an audio or visual stimuli that alerts the user to switch closure.
Non-tactile switches perform well in abusive environments and are more conducive in applications where large, hidden or irregular shaped keys are a requirement.
Printed circuit board switches are utilized in situations where there are trace routing limitations with traditional membrane switches or the OEM customer would like to utilize the PCB as a ridged backer that can also be populated with active and passive components, reducing the amount of materials and interconnects.
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The standard line of polyester keyboards features all the experience and know-how of GRAFOS. The efficiency of this kind of products, meeting the needs of having a complete and ready to use product, is guaranteed under hard demand. They are available in several models - 33 to 104 keys version- and are used above all for applications of Industrial Automation. There are different models for different applications: from frame to panel version, from desktop to drawer version and finally rack version. Membrane keyboards promise a pleasant palpation feeling with tactile feedback, security and precision during the data input, also by the use with gloves; the polyester front plate is resistant against numerous chemical active substances. In the side photo an example of 87 keys frame version of reduced dimensions and, as pointing option, a plastic trackball.
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Functional and clearly arranged: front foils and foil keyboards
Front foils and foil keyboards allow the production of robust flat input systems in a modern and customized design. Our experience and competence offers you an individual solution with high product safety. If you need simple stickers, individual front foils or a complete foil keyboard with the associated electronics and peripherals: our project teams will work out the most efficient solution for your needs.
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The Trio membrane keypad is a single unit which brings together all the elements required for an effective man machine interface in one package. This minimises the time taken to mount and connect to other Trio Motion technology control system products.
The unit consists of an IP65 keypad featuring 37 tactile keys, eight of which can be defined by the user and identified by inserting key legends from the rear of the keypad. Incorporated into the units is a four line by twenty character, vacuum fluorescent display. Connection to the control system is via a fibre-optic cable to the Master Controller. The interfacing is handled by dedicated built-in network interface software. The only other connection necessary is for the power supply.
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Accessories
* battery compartments
* sealing elements, even with specialized measurements
* screw inserts
* foils
* keyboard foils
* enclosure feet
* card guides
* hinges
* window fields
* stay bolts
* carrier track holders
* etc.
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A membrane switch, or membrane keyboard, is most often described as a thin, low profile, micro motion front panel assembly utilizing one or more layers of polyester, with screen printed conductors printed on each layer. The switch assembly is generally built with pressure sensitive adhesives to bond the polyester layers together.
When two or more circuit layers are designed into the switch panel, the adhesive spacers both separate and attach the conductive layers. Additionally, they provide the openings needed to allow for a switch closure between the two separated layers. Other options that are often provided on the front panel include an adhesive mounting sheet to attach the keypad to a housing or sheet metal bracket, and a graphic overlay. The graphic is used to provide the cosmetic appeal that is most often associated with a membrane switch assembly.
Tactile membrane switches are either stamped and plated metal contacts, or embossed polyester contacts, used in conjunction with a front panel assembly. The tactile element is generally part of the switch system: enclosed in the switch assembly to provide a "snap" or tactile response when the switch is actuated.
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User-friendly, flexible membrane switch keyboards that are long-lasting (>6 million actuations), reliable and cost-effective.
The Clicktouch process produces a thermoformed polyester foil with “elastic” spring zones enabling extended key travel. Circuit layers are printed on polyester substrates with special silver, carbon and insulation links, with additional protection against oxidation provided by over-printing with carbon.
Advantages over conventional membrane and metal dome based keyboards:
•Significantly reduced contact bounce (<2 ms)
•Long key travel (up to 2 mm) providing improved tactile feedback (even when operated by someone wearing gloves, a clear click can be sensed)
•No metal parts, resulting in a longer switch life and greater reliability.
Clicktouch retains essentially the same ergonomic performance as standard mechanical push buttons, but is also:
•Dust-tight
•Water-tight
•Chemically resistant
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Film and short-stroke keyboards
Standard versions
Customer-specific versions
Complete systems
Standard Keypads
Individual keypad from 1 to 40 keys
PC keyboards from 30 to 107 keys
Keyboard decoders and accessories
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Keyboards
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Si825x
The Si825x family of programmable digital power controllers provides closed-loop feedback control, system protection and power management functions for switch mode power systems and motor control applications.
Features
Single-chip, flash-based digital controller
Dedicated DSP-based loop processor
50 MIPS flash system management processor
Comprehensive, low-cost development kit
5x5 mm 28QFN and 32LQFP packages
125 °C maximum operating temperature
Applications
DC-DC, AC-DC converters
PFC circuits
Motor control systems
Isolation
UPS system
Level shifting
Ground loop elimination
Isolated analog data acquisition
Operator interface controls
Plasma TVs
Ethernet/CAN networks
Isolated point-to-point communications
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Aimtec expands its switching regulator converter product line with the addition of the AMSR1-78-NZ series of non-isolated, DC-DC switching regulators.
A feature rich, pin-to-pin replacement of 78xx linear regulators, the AMSR1-78-NZ step-down converters provide highly regulated output voltages ranging from 3.3VDC to 12VDC, producing maximum output currents of 1A at efficiency rates of up to 96% that remain virtually constant over the entire input range. Low output ripple and noise (60mV p-p) make these robust converters ideal for noise sensitive applications.
Ultra wide input ranges (up to 6:1) extend from 4.75-32VDC to 16-33VDC allowing these highly reliable products to be powered from unregulated sources.
Designed in a SIP3 package (11.68 x 8.9 x 17.5mm), the AMSR1-78-NZ series is pin compatible to the TO-220 package and makes these power supplies ideal for low profile circuit implementations such as portable power and standby-power applications.
Versatile for a multitude of industrial applications, the AMSR1-78-NZ series is designed to operate at full output power without heatsinking or forced-air cooling below +85°C, which is a distinct advantage for all applications.
Useful features include continuous short circuit protection, output current limit and thermal shutdown, Aimtec’s AMSR1-78-NZ series of DC-DC switching regulator converters can operate continuously at full load without the need for load derating below +71° C, within an ambient temperature range of -40° to +85°C.
The AMSR1-78-NZ series is made with high quality, RoHS compliant materials that undergo rigorous quality control to ensure reliability and performance.
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For Point of Load (POL) applications, MSK has created the first hermetic, hi-rel switching regulators product line. Offering high efficiency, high output current, wide input voltage range, and output voltages as low as 1.2 Volts, the MSK Switching Regulators product line allows circuit designers to power most of today's complex digital processors, FPGA's, and similar systems.
- Efficiency up to 95%
- Output Current up to 8 Amps
- Input Voltage Range from 5 to 80 Volts
- Fixed Output Voltages from 7 to 1.2 Volts, as adjustable versions.
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Part: IR3624M
Description: High Frequency Synchronous PWM Buck Controller in a 10-Lead MLPD Package.
Features
* Internal 600kHz Oscillator
* Operates with Single 5V or 12V Supply
* Programmable Over Current Protection
* Hiccup Current Limit Using MOSFET RDS(on) sensing
* Precision Reference Voltage (0.6V)
* Programmable Soft-Start
* Pre-Bias Start-up
* Thermal Protection
* 10-Lead MLPD Package
The IR3624 is a PWM controller designed for high performance synchronous Buck DC/DC applications. The IR3624 drives a pair of external N-MOSFETs using a fixed 600kHz switching frequency allowing the use of small external components. The output voltage can be precisely regulated using the internal 0.6V reference voltage for low voltage applications. Protection such as Pre-Bias startup, hiccup current limit and thermal shutdown are provided to give required system level security in the event of fault conditions.
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