Bread board. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Bread board. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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Before finally installing the parts on a circuit board or printed circuit board, it is advisable to mock up the design - assemble it in a draft and check the operation of all cascades. After all, the parts you purchased, especially transistors, will certainly differ in parameters from those indicated in the description. You will have to adjust their modes by selecting the appropriate resistors. This purpose is served by the breadboard. It is simply indispensable for the independent development of various devices.

Bread board

One of the breadboard designs is shown at the top of the figure. This is a kind of stand on which you can solder the parts of the device under test and, using variable resistors, select the desired mode of operation. To connect the power source, clamps (or just sockets) are installed on the board, and a switch is used to supply power.

Cut out the board from getinaks, textolite or other durable insulating material with a thickness of 1.5 ... 2 mm. Drill several rows of holes in the board with a diameter of 3 .. 4 mm and insert contact petals cut out of tin from a can into them. Spread the ends of the petals on the reverse side of the board to the sides, and be sure to irradiate the surface of the petals on the front side of the board. In the upper and lower rows, install 3-4 petals each and connect them with a thick (0,7 ... 1 mm) tinned copper wire - these are power buses. Connect the upper bus through the switch contacts with a negative clamp, and the lower bus with a positive one.

To install variable resistors, fasten a 1 ... 1,5 mm thick sheet metal corner with holes at the top so that the axes of the resistors are parallel to the board. On the corner, you can place the resistors most commonly used when setting up kinaructs, commemorating 1 kOhm. 10 kΩ, 100 kΩ, 470 kΩ, 1 MΩ

For ease of use, the breadboard should be tilted to the table surface. Therefore, attach racks of metal strips 1,5..2 mm thick, 10 mm wide and about 200 mm long on the sides of the board.

Now about how to use the breadboard. The conclusions of the parts that must be connected to each other are soldered to the contact petals. Moreover, they are not shortened yet, but are used completely. When mounting structures with pnp transistors, those parts that are connected to the power minus are soldered to the top bus. The lower bus serves as a common wire, and the conclusions of the parts are soldered to it, connected according to the scheme with a plus power supply. When mounting devices with n-p-n-transistors, a plus of the supply voltage is supplied to the upper bus, and a minus to the lower bus.

Author: B.S. Ivanov

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