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Pcb Unpopulated
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PCB-CB232F ComBoard Adapter RS-232 DB-9F (DCE), Unpopulated 2 Sided PCB, 1.40 x 1.50 in (35.6 x 38.1 mm) List Price: $6.90 Sale Price: $5.90  |
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The PCB-CB232F is a bare PCB to build the CB232F logic-level to RS-232 adapter. This is an unpopulated board and no parts are included. The BOM (bill of materials) and schematic diagram are available at www.BusBoard.us/parts/cb232f/ to construct the circuit. Soldering is required and prior experience with electronic assembly is recommended. A PCB soldermask helps prevent solder bridges on tracks and a silkscreen legend provides part locations. The CB232F provides an RS-232 interface for microcontroller projects. It can be used with RS-232 converter ICs using the MAX202 or MAX3232 16-pin DIP pinout. A power LED provides a visual indication of power status. The CB232F provides a DCE RS-232 serial port with a DB9 female connector. All thru-hole construction allows for easy assembly, maintenance, and modification. A DIP IC socket can be used to allow easy IC replacement to use different voltage/feature parts or to replace damaged parts. The CB232F uses the ComBoard standard for interchangeable serial interface modules. Various build options are possible including 4-wire serial, 1x10-pin ComBoard header, or a 2x5-pin shrouded header for use with ribbon cables. The CB232F can be used with solderless breadboards, microcontroller dev boards, or soldered onto prototyping boards. |
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PCB-CB232M ComBoard Adapter RS-232 DB-9M (DTE), Unpopulated 2 Sided PCB, 1.40 x 1.50 in (35.6 x 38.1 mm) List Price: $6.90 Sale Price: $5.90 |
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The PCB-CB232M is a bare PCB to build the CB232M logic-level to RS-232 adapter. This is an unpopulated board and no parts are included. The BOM (bill of materials) and schematic diagram are available at www.BusBoard.us/parts/cb232m/ to construct the circuit. Soldering is required and prior experience with electronic assembly is recommended. A PCB soldermask helps prevent solder bridges on tracks and a silkscreen legend provides part locations. The CB232M provides an RS-232 interface for microcontroller projects. It can be used with RS-232 converter ICs using the MAX202 or MAX3232 16-pin DIP pinout. A power LED provides a visual indication of power status. The CB232M provides a DTE RS-232 serial port with a DB9 male connector. All thru-hole construction allows for easy assembly, maintenance, and modification. A DIP IC socket can be used to allow easy IC replacement to use different voltage/feature parts or to replace damaged parts. The CB232M uses the ComBoard standard for interchangeable serial interface modules. Various build options are possible including 4-wire serial, 1x10-pin ComBoard header, or a 2x5-pin shrouded header for use with ribbon cables. The CB232M can be used with solderless breadboards, microcontroller dev boards, or soldered onto prototyping boards. |
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PCB-CB485 ComBoard Adapter RS-485, Unpopulated 2 Sided PCB, 1.40 x 1.50 in (35.6 x 38.1 mm) List Price: $6.90 Sale Price: $5.90 |
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The PCB-CB485 is a bare PCB to build the CB485 logic-level to RS-485 adapter. This is an unpopulated board and no parts are included. The BOM (bill of materials) and schematic diagram are available at www.BusBoard.us/parts/cb485/ to construct the circuit. Soldering is required and prior experience with electronic assembly is recommended. A PCB soldermask helps prevent solder bridges on tracks and a silkscreen legend provides part locations. The CB485 provides an RS-485 interface for microcontroller projects. It can be used with a wide number of RS-485 converter ICs using the common MAX483 and MAX485 half-duplex 8-pin DIP pinout. A DIP IC socket can be used to allow easy IC replacement to use different speed/feature parts or to replace damaged parts. The CB485 provides a RS-485 to logic level adapter. The ComBoard RTS input line controls the driver enable line. Either a 4 position terminal block (5mm pitch) or RJ45 connectors can be fitted for the RS-485 connector. All thru-hole construction allows for easy assembly, maintenance, and modification. The CB485 uses the ComBoard standard for interchangeable serial interface modules. Various build options are possible including 4-wire serial, 1x10-pin ComBoard header, or a 2x5-pin shrouded header for use with ribbon cables. The CB485 can be used with solderless breadboards, microcontroller dev boards, or soldered onto prototyping boards. |
Concepts of Printed Circuit Board Design
A Printed Circuit Board (PCB) refers to the bare unpopulated board without components. The aim of the electronic manufacturing industry has long been to achieve a reliable printed circuit board design with repeatable electrical characteristics, good mechanical properties and to be of an acceptable appearance. Up until the 1950s, electrical printed circuit boards and systems were assembled using individual wires to connect each of the components. The components were then mounted on what were known as tag strips and sockets.
In response to the needs of the consumer for repeatable performance, smaller sizes and above all lower costs, it was necessary to develop assembly schemes that would allow for greater manufacturing efficiency. One method that proved very successful was the use of printed circuit boards to provide the contact between components. These were made from a laminate of an insulating material and were typically about 1.6 mm thick. One side had a layer of copy foil fixed onto it.
The foil was then selectively removed to leave a pattern that interconnected the components in the desired manner. Holes were then drilled through the laminate material to enable components to be fixed to the non-copper side. The components had flexible leads as their connection points and these were passed through the laminate. Electrical connection was achieved by soldering these to the remaining foil. The foil provided the required electrical connection between the components.
The process met the needs of volume manufacture in that it could be relatively easily automated and created a final product which gave repeatable electrical performance and had sound mechanical strength.
Early printed circuit boards were simple designs comprising a small number of components and limited interconnections. Layout level design took place by manually constructing the artworks (or interconnection patterns) for each layer using tape on transparent sheets. Due to only the one layer of connection available to the printed circuit board designer, no connections could be permitted to corss, otherwise a short circuit would occur. These patterns were then photographed to produce the masks for fabrication. As printed circuit board densities began to increase it was necessary to allow for more and more layers of interconnect to enable the complexity of design. This resulted in a more and more intricate design problem and it became apparent that some degree of automation would be needed to manage the increasing difficulty inherent in the design process.
The design and manufacture of modern electronic equipment has taken these principles to the extreme. There are now up to 32 layers of interconnect possible between any two points on a printed circuit board, and depending on the manufacturing process, even more may be possible. The numbers of layers of interconnect means that the surface area on the printed circuit board can be much reduced and more components fitted onto the smaller area. The type and shape of components being used in the design are also continually reducing and new features are being added. The printed circuit board design process must itself be adaptable and able to keep up to date with these changes. Finally, the level of complexity of printed circuit boards now means that they can only be effectively designed by using computer-based design tools.
Introduction to PCB Technology. “1.1 Introduction.” Concepts of Printed Circuit Design. 26 Oct. 2009 [http://www.ami.ac.uk/courses/ami4809_pcd/unit_01/index.asp#1].
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