Always scan any information downloaded from the internet with an up to date virus scanner before opening the downloaded information. However, we do not accept any liability for any loss, damage or inconvenience, of any kind, as a result of downloading any information from this site. All the downloadable content on this website has been scanned thoroughly for viruses. All information on this website is supplied free of charge, in good faith and without warranty. We make every effort to ensure the information contained here is as accurate as possible, but we will not be responsible for any errors or omissions, or anything resulting thereof. This Website contains a compilation of information already available elsewhere on the internet and therefore considered to be in the public domain. If you collect or restore old radios, crystal sets, early scientific apparatus, vintage test equipment, military surplus, or other unique old technical. Disclaimer Brand names and product names are the property of their respective owners. Sponsored LinksPlease select your desired model below. Heathkit Cr-1 Crystal Radio Manual Free.Heres what the circuit now looks like with two earphones connected to. Most crystal radios use only one half of a radio frequencys wave. When the diode detector chops off part of the radio frequency. The 1,400 KHz signal that has been coupled to the station tuning. 1050 PDF files (Adobe Reader XI) on DVD R FREE SHIPPING ALL AROUND THE WORLD! Imagine that we have a crystal radio like the one above connected to a.