GB1003181A - Improvements in modular electrical units - Google Patents

Abstract

1,003,181. Circuit assemblies. GLOBE-UNION Inc. June 21, 1962, No. 23878/62. Heading H1R. In a modular electric unit, a semi-conductor device and other electrical devices mounted on one face of an insulating plate, through which are sealed conductive paths from said devices, are housed in a container into which the plate is sealed. As shown, a 4-stage transistor amplifier assembly comprises a ceramic disc 10, Fig. 2, having a plurality of apertures in which are mounted leads 1, 2, 3, 5, 6 (see also Fig. 1), which shows the top face of the disc 10. The leads are soldered at 36 to conductive areas 38 around each aperture which is lined with a layer 45 of silver paint &c., or an eyelet, or a cup-shaped connector. Resistors 22, 28, 34 of, e.g. stencil-screened carbon-containing paint, are applied to the top of disc 10 and connected into the circuit by conductive layers 88, 89, 93, 102, 103, 116, which may contain Ag and be screened on and then fired, and a wire lead 91; an insulating coating 39 is applied over the resistors. To the under face of the disc 10, Fig. 3, are applied resistors 12, 14, 16, 18, 20, 24, 26, 30, 32, conductive areas 70, 74, 76, 86, 90, 96, 99, 106, 108, 120, 122, and an insulating layer 37; transistors 40, 42, 44, 46, Fig. 4, and then soldered to relevant conductive areas. Four quadrantal capacitors such as 50, 54, Fig. 2, a full-disc capacitor 56, and a thin capacitor 58 are connected into circuit by means of ribbon leads 68, 72, 78, 82, 92, 94, 98, 104, 112, 118, 126, Figs. 3, 4. The whole assembly is sealed in a metal container 62 by solder 64 to which terminal lead 4 is connected.