I've been having a lot of fun experimenting with zinc negative resistance oscillators. I've used tips from K7NS, Nyle Steiner's "Spark Bang Buzz" website: http://home.earthlink.net/~lenyr/zincosc.htm to create working audio and RF oscillators using negative resistance devices made from galvanized sheet metal. While it takes patience to find the sensitive zinc oxide spots and the power level is very low, they do work surprisingly well.
K7NS used an LC circuit to make an oscillator on the broadcast band, but I thought crystal control would be interesting to try, and to my delight, the output is clean and stable. I've had success with both an old 1196 khz crystal that I had in my junkbox, and a 3.58 mhz TV color crystal. It's definitely QRPp, but coupled to an antenna, the signal can be heard around the house. I've also had good results using a backwards audio-output transformer fed from a CD player as an AM modulator. It's pretty cool to transmit music with good fidelity using a transmitter made our of junk! Take a look at my short video: http://www.youtube.com/watch?v=cDBpBYkRw0Q I'd love to hear from others who are interested in experimenting with this kind of stuff. 73, Bob W9RAN ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
