Circuit World: Volume 7 Issue 2


Table of contents

Using Hydrogen Peroxide/Sulphuric Acid Spray Circuit Etchant

Fred W. Kear

Among the many types of printed circuit board etchant now available, there are a variety of notable advantages and disadvantages. This is confusing to the PCB manufacturer because…

Improved Laser Trimming Geometry for Thick Film Resistors—Philosophy and Example

R.G. Aggleton

Laser trimming method suitable for close tolerance film resistors is examined further and a simple analysis leading to an outline computer programme is described.

Circuit World Visits Plessey Circuits: Secretary of State for industry opens £5 million PCB plant

In a climate of economic unrest and limited job availability, it is always encouraging to hear of industrial ventures which help to alleviate the gloomy situation. The North East…

Round the Circuit

By arrangement with Loraid Services Limited, Bakelite UK Limited has established a stock of copper‐clad paper and epoxide glass laminates at Loraid's Littlehampton warehouse. A…

Institute News

Institute members are reminded that the Second Printed Circuit World Convention is to be held in Munich from Tuesday, the 9th of June to Friday the 12th June 1981, both dates…

Screen Printing for Printed Circuit Boards

C.A. Walter

Silk screen printing is a much used method of producing the required images on printed circuit boards. This paper discusses in detail the techniques and limitations of the process.

Treatment of Copper Surfaces in Printed Circuit Manufacture

G.D.M. Menzies

Copper surfaces of laminates can be damaged by abrasively brushing prior to chemical processing. This is especially important where gold plated edge connectors are made to the…

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Emerald Publishing Limited

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  • Associate Professor Pooya Davari