![]() The dimensions of the output transformer to the extent above indicated were achieved by use of extremely fine wire in the windings and use of a small core of high permeability material. This latter condenser-resistance coupling can also be combined with input transformers of small dimensions in the case of point contact or other transistors where the emitter current is large. Alternatively, an input transformer may be replaced by a condenser-resistance coupling of the type shown in certain of the figures. In the case of the input transformer, if one is used, it also can have very small dimensions when used with an NPN type transistor because of the very small base current involved. H03F3/04- Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices onlyĪs illustrating in a general way the space saving that is achieved by the invention in avoiding the necessity of transmitting the feed current through the primary winding of the output transformer, a consequent reduction in size of 25 to l was found possible in an audio transformer in one instance considered typical.audio preamplifiers with semiconductor devices only H03F3/183- Low frequency amplifiers, e.g.H03F3/181- Low frequency amplifiers, e.g. ![]()
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