OCR Text |
Show How Pigtail Leads Will Increase Efficiency Pigtail connections are Just as de-olrahle de-olrahle and necessary for a condenser ,s for a variometer or variocoupler. In many condensers the rotor shaft makes contact by rubbing against a little brass or copper strip to which a screw or binding post is attached for making connections. After a period of use the point where the contact Is made becomes black, as you can verify by looking at your own condenser If you are using the ordinary type. This black coating prevents the rotor shaft from making good electrical contact with the brass or copper strip, and thus greatly cuts down, the efficiency of the conductor. However, It Is easy enough (o make your own pigtail connections for your condensers. Get a piece of insulated Iltzendrant wire, or the small flexible leads sold at all radio stores for making mak-ing battery connect ions, and cut off a piece about two inches long. Clean oil' the edge of the rotor shaft where it makes contact with the brass strip and solder one end of the flexible flex-ible lead to this cleaned part of the rotor shaft. The other end of the two-Inch lend is then soldered to the screw or binding bind-ing post used for connections to other par;s of the set. This completes the "pigtail" and will greatly increase the ollleicney of the condenser. In many cases the pressure of the contact strip against the rotor shall serves also to k'-ep the rotor plate properly spaced l.etweecn the s'ali.r plates. If this is the case, the brass strip should not be removed, hut should be used in conjunction with the pigtail connection. |