H - Electricity – 05 – K
Patent
H - Electricity
05
K
356/12, 356/25
H05K 1/03 (2006.01) H05K 1/05 (2006.01) H05K 1/16 (2006.01)
Patent
CA 1137649
Abstract of the Disclosure A porcelain coated metal substrate bearing a printed circuit and in which a lossy capacity effect is created between the substrate and the circuit to eliminate unwanted frequencies. The capacitor may be formed by having a ground connection to the metal substrate or by providing a further capacitance from the substrate to another conductive member which is itself ground. The invention is of particular use for audio equipment, e.g. a pushbutton switch for telecommunications equipment is which high frequency signals are to be eliminated.
355876
Chaput Guy J.
Sich Edward M.
Austin Reginald J.
Northern Telecom Limited
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