In the 1950s there were lots of DIY electronics designs for sale. They were printed on large sheets of paper (easily up to a metre in width), with precise descriptions of how to build the project — such as an audio amplifier or a radio receiver. In the Netherlands, such ‘plans’ or ‘blueprints’ were published by various companies, including Amroh, originally a transformer manufacturer that found this a good way to boost their turnover.
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