After three e-mailed requests to rectify the mistakes made in his book , Mr Wilhelm decided not to answer me . All I want is a proper adendum to the text in his book . A simple turning of the transistors by 180 degrees is not enough . First of all I would like to know if the mistakes made were also made in the Dutch and French translation .If that is not the case I would turn the transistors in the wrong direction would'nt I ? Simple question innit ! Well it's quite on all fronts . Do we see a willful ignoring here or what is it ? The publisher and the writer are now aware of the misrepresentation because their book is NOT for ,,selbstbau ,, ( do it yourself ) . It cannot be done considering the mistakes . So we must conclude that either they are a little slow in responding , or that they could not care less about us , the buyers of their book . If that is so I would advise against buying untill proper rectification , in whatever form is made . Kees