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The ULN2803ADWR provides a high output current drive with a very low input current, which equates to a low general-purpose input/output (GPIO) voltage. The GPIO voltage is converted to base current through the 2.7 kΩ resistor connected between the pre-driver Darlington NPN’s input and base. The 7.2 kΩ and 3 kΩ resistors connected between the base and the emitter of each NPN suppress the leakage that may occur from the input.

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By considering thermal and electrical properties, designers can design PCB layouts and incorporate thermal management strategies that maximize the efficiency, reliability, and lifespan of the electronic systems they develop.

We chose the GT-3600 to do tight radius work and we see it being utilized in our parking lot work and also in radius work on city streets. I like its versatility for our company. That was the main thing that drew us to it... more production, less handwork. It puts out great looking curb. It’s been a good purchase for us and we’ll continue to keep utilizing it. The GT-3600 is handling 44 inch (1118 mm) wall with no problems and it’s doing a good job. If everything goes well it’s kind of boring, but it’s only boring if your set up is correct and you have a machine as dependable as a GOMACO.

The versatile GOMACO GT-3600 slipforms a drainage channel in France. The sidemounted design allows minimum-clearance on the left side of the mold.

The mold on the GT-3600 is positioned to assure accurate placement of the concrete through a radius. Also important for a tight radius is travel speed, mix design, slump of concrete, and grade preparation.

The Xtreme GT-3600 is now available as a hybrid machine! The industry’s first hybrid curb and gutter machine. Click here to learn more.

The standard 24 inch (610 mm) wide trimmerhead with insert sections provides up to a 66 inch (1676 mm) wide sectionalized trimmerhead with right-hand or left-hand discharge available. The insert sections are available in 12 inch (305 mm), 18 inch (457 mm), and 24 inch (610 mm) widths.

Fast concrete loading provides high-production results. There are two conveyor systems to choose from with the GOMACO GT-3600, the standard belt conveyor and the auger. The standard conveyor for the GT-3600 is 16 feet (4.88 m) long, 24 inches (610 mm) wide, and has a belt speed variable up to 284 feet per minute (86.6 mpm). It is hydraulically powered and reversible with a charging hopper. The belt conveyor is pivot mounted with hydraulic lift and positioning. The mold is designed with extra concrete capacity, to allow slipforming through a tight radius without waiting for concrete delivery.

• The G+ wireless remote control is an option available for the Xtreme GT-3600. The G+ remote control allows the operator to work from the operator’s platform or the ability to move around the machine with hands-on control at all times.

Designed for easy transportation, the Xtreme GT-3600 curb and gutter machine can be driven straight onto the truck bed after a day of slipforming.

The centermounted mold on the GT-3600 is built with a “frame around a frame” concept, which is illustrated by the orange sections of framework in these drawings.

The tethered remote allows the operator to control speed and steering while moving around the operator’s platform. The travel control dial dictates the travel speed of the machine in either forward or reverse. The manual steer knob turns the tracks when the steer select knob is in any of the four manual positions.

The ability to raise and lower the trimmerhead and mold makes the GT-3600 ideal for rehabilitation work and going over driveways, manholes, and other obstacles. The GT-3600 can pave right up to the driveway. Then the operator raises the mold, allowing the machine to travel across the distance of the driveway, without leaving the stringline. The mold is then lowered to grade and slipforming continues.

A Darlington transistor’s maximum ratings are essential for PCB designers to know because they define the operational limits within which the transistor can function without risking damage or failure. Below are the absolute maximum ratings for the ULN2803ADWR as presented in the datasheet:

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The GT-3600 trimmer features a maximum hydraulic sideshift distance of 48 inches (1219 mm), allowing the operator to slipform curb and gutter within inches of obstacles within residential areas.

• G+ Radius Software ‒ Pick your radius and G+ calibrates and manages all aspects of traveling around it on stringline, including track angles and individual variable track speeds.

• Excellent fuel efficiency combined with an increased fuel capacity allows for an uninterrupted day of paving on the project.

• An optimized cooling package with a hydraulic fan controlled by G+ adapts the cooling needs to job-site conditions for both a quiet and efficient operation.

- The Xtreme GT-3600’s G+ control system easily interfaces with stringline or a 3D guidance system for curb and gutter and tight radius applications.

The trimmerhead can be raised 16 inches (406 mm) and sideshifted up to 48 inches (1219 mm) for clearance of obstacles and to allow the GT-3600 to pave right up to the obstacle. The mold can then be hydraulically lifted off the curb and over obstacles.

All-Track Positioning (ATP) provides the versatility in our slipform pavers. GOMACO’s left-front track features a pivoting power-swing, the right-front track hydraulically extends/retracts, and the rear track hydraulically sideshifts. Each leg has a reinforced steel attachment plate that allows extra leg height adjustment. ATP provides the capability of performing various applications and working with differences in grade elevations and unique job-site logistics.

The 16 foot (4.88 m) long conveyor aids the Xtreme GT-3600 as it slipforms 21 inch (533 mm) tall stand-up curb by feeding the hopper at a maximum belt speed of 284 feet per minute (86.6 mpm).

The operator’s platform and safety railing telescope out with the sidemounted mold to give the operator visibility over the entire operation. This GT-3600 is slipforming a five foot (1.52 m) wide sidewalk.

A project for 10 rows of stair-stepped risers within a new football stadium is completed in five passes around the facility with the GT-3600.

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- The Xtreme GT-3600 features the GOMACO three-sensor radius system for stringline. When paving with stringline, the lead steering wand is allowed to leave the stringline and reference is switched to sensor number two for traveling around the tight radius.

An operational speed of up to 42 feet per minute (12.8 mpm) allows for high production curb and gutter slipforming with the GT-3600.

Straight Blade: Guillotine-style curb depressor has a straight blade that enters the face of the curb while slipforming through driveways.

An auger is also available that provides fast and efficient concrete flow. It features a 16 inch (406 mm) diameter auger with full pitch, for efficient handling of concrete.

• The GOMACO Xtreme GT-3600 is also available with the optional GOMACO Remote Diagnostics (GRD) for machine troubleshooting, diagnostic reviews, software updates, and more.

Curved Blade: California-style curb depressor has a curved blade that enters the face of the curb, providing a smooth finish.

The conveyor belt wiper is a standard bolt-on attachment for the GT-3600 and features a single solid polyurethane blade and steel frame spanning across the belt. This allows the cleaning tip to maintain continuous contact without the need for constant adjustment. The quick tension design allows for easy adjustments or to release tension on the polyurethane blade for replacement and clean-out. Unique single pin blade retention system permits blade replacement without the use of additional tools.

GOMACO & Topcon Concrete Solutions Simultaneous Paving With A GT-3600 & Xtreme Commander IIIx Oregon, Wisconsin 41 seconds

The optional hydraulic-powered driveway depressors are available for curb and gutter molds. They allow the GT-3600 to eliminate wasted material while slipforming through driveways.

• Xtreme Steering Capabilities ‒ The Xtreme GT-3600 is equipped with rotary-sensored slew drives, on each of the three tracks for extreme steering ability.

The 16 foot (4.88 m) long, 24 inch (610 mm) wide conveyor can move the concrete into the hopper at a speed of up to 284 feet per minute (86.6 mpm).

The optional 17 foot (5.18 m) long hydraulically driven auger is equipped with vibration to release concrete build up from the safety guard at the end of the hopper. The auger safety guards are hinged to allow for cleaning.

GT-3600 Photos: Xtreme Steering - Curb & Gutter - Sidewalks & Recreational Trails - Tight Radius - Barrier - Unique Applications

The GT-3600 is the correct size for our type of work and offers us all the necessary options. It was a good value for our money, it offers a solution to our projects at a good price, and it gives us the flexibility and ability to pour curbs, sidewalk, or cycle track.

The hopper on the GT-3600 is designed for extra concrete capacity. Loading the hopper and the 16 foot (4.88 m) long, 24 inch (610 mm) wide charging conveyor full prior to going into the radius allows for continuous travel through the radius without having to wait for another concrete delivery.

In typical operation, the diodes on the base and the collector pins to the emitter are reversed-biased. If these diodes are forward-biased, internal parasitic NPN transistors draw a nearly equal current from other pins.

The GT-3600 can be retrofitted with a 10 foot (3.05 m) wide undermounted sidewalk mold for paving larger pathways and access roads.

The ULN2803ADWR is a smart choice for solenoids, relays, lamps, small motors, and display drivers (light-emitting diode and gas discharge). Paralleling outputs can serve applications that require sink currents beyond the capability of a single output.

- The intelligent All-Track Positioning on the Xtreme GT-3600 includes a smart hydraulic cylinder on all three legs. The smart cylinders allow G+® to know the position of all three tracks and can make steering adjustments as needed.

The ULN2803ADWR has eight negative-positive-negative (NPN) Darlington pairs featuring high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The Darlington pairs can be connected in parallel for higher current capability, and each pair has a collector-current rating of 500 mA.

The ULN2803ADWR, made by Texas Instruments, is a high-voltage, high-current Darlington transistor array. Invented by Sidney Darlington in 1953, a Darling transistor configuration has bipolar transistor pairs with the emitter of one transistor connected to the base of the other so that the current amplified by the first transistor is amplified more by the second one. The article below examines the characteristics of the array detailed in the ULN2803ADWR datasheet.

The Xtreme GT-3600’s tracks can rotate farther than ever before. The rotary-sensored slew drives allow the tracks to rotate 90 degrees and more for quick side travel and job-site mobility.

3D machine guidance helps achieve minimum clearance eliminating the need to set stringline on projects where existing utilities create challenges.

Repeatable mold offset is accomplished through G+ and a smart hydraulic cylinder for telescoping the mold mounting system.

In addition to the characteristics above, the ULN2803ADWR datasheet provides more information for your PCB layout design. As shown in the schematic, footprint, and 3D model below, your component’s CAD model and data must be accurate and from a trusted database to be helpful.

The GOMACO Xtreme GT-3600 is slipforming an 18 inch (457 mm) stand-up curb and is equipped with the GOMACO Remote Diagnostics (GRD) allowing for remote upgrades and fleet management from a cell phone or laptop computer.

GT-3600 Photos: Xtreme Steering - Curb & Gutter - Sidewalks & Recreational Trails - Tight Radius - Barrier - Unique Applications

The thermal and electrical characteristics of Darlington transistors are also important to know because they enable PCB designers to select and integrate transistors into their designs while ensuring optimal performance and reliability. The datasheet shows these characteristics of the ULN2803ADWR.

Using the telescoping mold and hold-down, the GT-3600 is able to achieve minimum clearance when slipforming curb and gutter below the existing grade in a residential area.

An 18 inch (457 mm) curb and gutter is slipformed using 3D machine guidance by the Xtreme GT-3600 in a new residential development.

The optional sidemounted barrier and parapet attachment allows the GT-3600 to pave a maximum height of 50 inches (1270 mm).

From our point of view, there was never any other machine manufacturer we were going to buy our equipment from except GOMACO! The quality of the equipment is far greater than any other machine on the market. And when there was ever a problem, your team had it solved in no time. It’s like the Master Card commercial. Your service and dedication is and always has been PRICELESS!!!

By combining manufacturer PCB layout data with the components’ specifications, characteristics, and performance metrics in their datasheets, you can design your PCB effectively and efficiently.

I want to personally thank everyone at GOMACO for all of the great care that you and your associates have provided us over the past 23 years! I can’t believe it’s been that long since we first bought our first GT-3600 in 1993!

- The Xtreme GT-3600’s sensored All-Track Steering and sensored All-Track Positioning, make it the ultimate, intelligent slipform paver.

Slipforming curb and gutter in an existing residential area is done efficiently with the GT-3600 equipped with 3D machine guidance. The ability to block out existing driveways on-the-go allows for less follow up work.

Parking lot island radii are a breeze with the Xtreme GT-3600’s steering capabilities and 3D machine guidance. Combining the sensored All-Track Steering and sensored All-Track Positioning has made the Xtreme GT-3600 the ultimate, intelligent slipform curb and gutter machine.

A GT-3600 slipforms variable barrier ranging in height between 34.8 to 50 inches (885 to 1270 mm) on a project in Perth, Australia.

The GT-3600 with 3D machine guidance slipformed radii as tight as 2.5 feet (0.8 m) on this parking lot project. The GT-3600’s All-Track Steering, combined with the 3D system’s steering algorithms, allow smooth entrances and exits and tighter cornering for tight radii work.

The GOMACO GT-3600 is carefully designed to give years of dependable and safe service. The emergency stop buttons are on the operator’s console, and on corners of the machine, which are easily accessible from the ground level. Another safety feature is a backup alarm, which is designed to alert personnel around the machine when the tracks are set to operate in reverse. Machine decals are shown as internationally recognized symbols. Other safety features include track guards, warning decals, an operator’s manual, and a safety manual.

- Intelligent off set is accomplished with a smart hydraulic cylinder for telescoping the mold mounting system. This provides G+ the ability for repeatable mold offset. The trimmerhead and mold have independent vertical adjustments for raising and lowering.

- The G+ radius software for the control system allows the operator to program the size of the radius into the controller. As the Xtreme GT-3600 approaches the radius, with the values already dialed in, the operator activates the radius program, and the curb and gutter machine slipforms around the radius. It’s now easy for any operator to pour a radius.

The powerful trimmerhead features a direct drive radial piston hydraulic motor that provides maximum torque for tough trimming applications.

• Xtreme Hydraulic Package ‒ Independent hydraulic travel control to each track allow G+ to control each individual track speed through a radius.

All-Track Positioning (ATP) provides easy setup for slipforming sidewalks. This GT-3600 is slipforming a five foot (1.52 m) wide sidewalk with a side-mounted mold.

GOMACO’s Hook-and-Go mold mount system has no pins or latches and makes it quick and easy to change molds. Simply drive the GT-3600 up to the mold and hook the mount to a special attachment plate. The mold is then hydraulically lifted up and can go to work slipforming the project... just hook and go. GT-3600 molds are built for this system and existing molds can easily be retrofitted in the field.