Installation of microcircuits of the K155 series by winding the wire. Scheme, description

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Installation of microcircuits of the K155 series by winding the wire. 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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The prototyping of amateur radio devices is usually associated with repeated soldering of parts. This negatively affects the state of the microcircuit pins, and the process of dismantling microcircuits is very laborious. To facilitate the prototyping process and ensure the safety of microcircuits and other details, you can use the installation of a wire winding method.

Installation of microcircuits of the K155 series by winding the wire

The essence of the method is that all connections in the device are made with bare copper wire, tightly winding it around the leads of the parts. In order to ensure reliable contact in the connection and facilitate this operation, there are various tools and devices. One of them is described below.

Its basis is the insert-holder of the stylus from the drawing compass (a holder with a through axial hole is suitable). A brass tube 4 about 80 mm long is pressed onto the holder shank. Two brass strips 6 sized 25x5 mm and about 0,5 mm thick with a hole at the end are soldered to the upper (according to the figure) end of the tube. These strips form a coil holder 8 with a supply of mounting wire; screw 7 serves as the axis of the coil. Two steel tubes cut from the needles of medical syringes are clamped into the cartridge 3 of the lead holder.

The tube 1 has a diameter of 0.8 and a length of 35 mm (from the needle of article 0840), and the tube 2 has 1,2 and 25 mm, respectively (from the needle of article 1240). Tube 2 serves as a guide for the mounting wire and at the same time as a cutter that removes a film of oxide or insulating varnish from the wire (the presence of a cutter allows installation with an insulated PEV-1 winding wire). The protruding end of this tube needs

sharpen perpendicular to its axis on the grinding wheel; edges should be sharp but free of burrs. The edges of the opposite end of the tube are smoothed and a guide tube 5 about 100 mm long made of rigid polyvinyl chloride is put on it.

Tube 1 is, as it were, the hollow axis of the entire instrument - this tube is put on the output of the microcircuit and the instrument is rotated, pressing the end of the mounting wire with a finger to the board. In this case, the mounting wire is pulled out of the tube 2 and tightly wound onto the output. Tube 1 should protrude 4 mm from the cartridge, and tube 2 should protrude 3.7 mm.

After winding the wire on one terminal, the device is transferred to another terminal, and so on. ns breaking the wires, connect the required number of pins. The necessary tension of the wire is set with the screw nut 7. As tests have shown, the connections made by the winding method with the described tool are very reliable.

Author: G. Kunakov, Moscow; Publication: N. Bolshakov, rf.atnn.ru

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