Transistor Yang Sama Sm 7580

ALL ABOUT SM All about Surface Mount components.. SM transistor database, soldering and testing. Buying SM transistors, capacitors, resistors, diodes and SM Prototyping PC boards.. Click for SURFACE-MOUNT Marking Code-to-Transistor List 1 Philips only Click for SURFACE-MOUNT Marking Code-to-Transistor List 2 Philips & others Click for SURFACE-MOUNT Transistor-to-Marking Code Reverse of List 1 above Click to buy SURFACE MOUNT packs. DESIGNING WITH SM It all depends on the type of circuit you are going to design, but if you want the final result to look really professional and up-to-date, I recommend using SURFACE MOUNT technology. You don't have to make the whole project SM. You can combine SM with through-hole components, as some items are not available (or not suitable) in SM form.

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You may want to use chips that can be inserted and removed (such as microcontroller chips) or air spaced coils (for high frequency oscillators) or a potentiometer with a knob. Even a combination of components looks very neat and if you buy your components from Talking Electronics, you can produce very low-cost prototypes. When it comes to production costs, SM becomes the cheaper alternative when very large quantities are ordered.

In the meantime, you can start with TE surface-mount prototyping boards and develop your skills in this area. The following SM prototyping boards are available and these are mainly designed for SM IC's. See below for PC board prices. You simply cannot design a circuit around a chip that only comes in surface-mount, without a designer board. The pin spacing does not fit any other prototyping boards and you cannot solder to the pins without placing the chip on a board.

Some chips come in both surface-mount and standard pin spacing. A history of english literature in urdu. You have to be careful, sometimes the surface-mount variety behaves differently.

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We found this to be the case with the CD 40106 Schmitt trigger IC. There are 5 boards in the set: 8 pin, 14 pin, 16 pin, 20 pin & 28 pin - only 4 boards are shown: (the boards are considerably smaller than shown here - the pin spacing is 20 pins per inch for DIL TYPES! The normal spacing is 10 pins per inch.). Standard components can be placed around the SM chip and all the parts are placed on the track-side of the board.

This saves turning the board over during development. The layout is called 'birds nest' or 'rats nest' and although it doesn't look tidy, it's the only way to experiment as each item can be fitted, removed and tested without turning the board over and losing your concentration. Once you get the circuit working you can tidy up the layout and reduce the size of the board. When it comes to SM, the board is considerably smaller than a conventional design and it is cheaper to produce as it does not require drilling. The 28 pin board can take an 8 pin and 14 or 16 pin.

When loading the boards by hand, SM assembly time is about the same as conventional assembly and most of our assemblers prefer SM as they can line-up 20 to 50 boards and fit one component at a time with tweezers, without having to turn the boards over. Once you master the 3-Step process of soldering SM, you will want to design everything in this medium. SOLDERING SM To solder SM, you need three items. A very fine-tipped soldering iron with adjustable temperature. A set of fine tweezers.

Fine solder - and I mean really fine solder! You may also need a magnifying glass (magnifying lamp) to help with placement, soldering and inspection.

IDENTIFYING SM RESISTORS All SM resistors conform to a 3-digit code: (See 4-digit code below) A 330k SM resistor The first two digits represent the two digits in the answer. The third digit represents the number of zero's you must place after the two digits. The answer will be OHMS. For example: 334 is written 33 0 000.