Breadboard for microcircuits. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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For prototyping of structures with digital microcircuits, I propose to make a special board from double-sided foil of glass fiber laminate. The board is designed to install a standard 18-pin DIP connector on it.
The upper side of the board (Fig. 1) is working. It is mounted on caps, each of which is connected to its "own" output of the microcircuit (Fig. 2), and four L-shaped foil areas. The pads can be connected to each other at points A - D with a drop of solder, thereby forming power buses of the required length or simply a common wire connecting several external elements. The gaps between the pads are given a special shape, which ensures their low capacitance, which is important when prototyping high-frequency devices.
Since the board is designed for multiple soldering, it is recommended to preliminarily determine the quality of the fiberglass on a small segment by heating it with a powerful (100 W) soldering iron and quickly cooling it in water. For a good material, after several cycles of heating - cooling, the foil should not peel off.
The drawing is applied and the board is etched by one of the known methods. After etching, the printed conductors on the side of the microcircuit should be stripped and tinned with low-melting solder. Hollow mounting caps are inserted and riveted into holes with a diameter of 2,5 mm, and then a connector is installed under the microcircuit. The connector pins and caps are soldered from the bottom side of the board, after which it is recommended to cover this side with a thick layer of epoxy resin or heat-resistant varnish to prevent accidental short circuits of the conductors.
Prototyping on the finished board is carried out in a certain order: first, external parts are mounted on caps and foil sections, then a microcircuit is inserted into the connector and the supply voltage is applied. At the end of the adjustment, the layout is disassembled in the reverse order.
The board is designed for prototyping devices with a wide variety of microcircuits having from 8 to 18 pins. In addition, two microcircuits with eight pins or a microcircuit and transistors (from KT315 to KT815) can be inserted into the connector.
A similar prototyping board can be made to test devices with microcircuits for a larger number of pins or with other packages.
Author: A.Pakhomov, Zernograd, Rostov region
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