Avoiding Hand-Capacity

Radio Record, Volume V, Issue 26, 8 January 1932, Page 15

Avoiding Hand-Capacity

THE small semi-variable compression type condensers are usually made up of two metal plates or sets of plates with interleaving sheets of mica. Capacity is varied by a set screw, the rotation of which tends to reduce or increase the spacing between the plates. It is important to notice that to mini mise hand capacity effect the set of plates which makes metallic contact with the adjusting screw should be joined to the earth or low potential end of the circuit. Identification marks are not normally provided for the terminals, but their. internal connections are easily traced without dismantling by making an electrical test. Before doing so, however, it is, of course, essential that the control knob should be screwed home sufficiently for contact to be made between the screw and the metal plates.