Building block for model railway has flat circuit board or chip carrying control circuit, resting on substrate or support board with electrical contacts and rectangular central aperture

摘要

The building block for model railway has a flat rectangular circuit board or chip (1) carrying a control circuit with several contacts. This circuit board rests on a rectangular substrate or support board (2) with a set of electrical contacts (3) and a rectangular central aperture. The control circuit chip covers the aperture in the support board. The support board may carry further circuits and fuses.