| 摘要 |
<p>The printed circuit board mfr. includes insulating the particular metallised holes of those formed in the surface of the board, where the normal component connections are formed by distance soldering. Instead of using a mask to cover the particular holes, each hole has a pin with a surrounding insulating tube inserted in it before the soldering procedure. The pins are subsequently removed to allow the particular connections to be made. Pref. the tubes of these pins are colour coded in accordance with the dia. of the wire required to form the connections. The method of insulating selected holes is flexible and applicable to various printed circuit boards, with the problems involved in removal of the mask avoided.</p> |
