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</html><thumbnail_url>https://forum.brickrknowledge.com/content/uploads/2016/06/18_11_1-1024x768.jpg</thumbnail_url><thumbnail_width>1024</thumbnail_width><thumbnail_height>768</thumbnail_height><description>In circuit 18.7 we talked about to the use of relays in early computers. In the arithmetic unit of a Zuse-Computer, NOT functions have been implemented similars as we will do in the current experiment. The high level at the output is always present if the button has not been pressed. The input signal of [&hellip;]</description></oembed>

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