{"id":953,"date":"2014-11-19T15:18:17","date_gmt":"2014-11-19T14:18:17","guid":{"rendered":"http:\/\/www.pa3hcm.nl\/?p=953"},"modified":"2021-01-18T17:13:29","modified_gmt":"2021-01-18T16:13:29","slug":"simple-signal-tracer","status":"publish","type":"post","link":"https:\/\/www.pa3hcm.nl\/?p=953","title":{"rendered":"Simple signal tracer"},"content":{"rendered":"\n
\"[Image]\"<\/a>
The completed original version of the signal tracer.<\/figcaption><\/figure><\/div>\n\n\n\n

I found a really simple project<\/a> for kids to attract them to homebrewing and hamradio. It is also very nice for people who want to learn soldering electronics. It’s a “signal tracer”, which means it detects all kinds of RF signals radiated by devices around you. It demodulates the signal, allowing the user to actually “hear” signals produced by a TV, computer, LED light, electrical wiring in the walls, etc. I showed it to different people, they all went walking around the room for a while and curiously listened to all the different signals.<\/p>\n\n\n\n\n\n\n\n

I built two versions. The first version sticks to the original design. This design begins with a piece of wood and a handful of drawing pins. The pins have to be put into the wood according to a given pattern. Then some electronic components and wires are soldered onto these pins. The design also includes a switch you have to make your own, using drawing pins and a paper-clip. The antenna is made of some solid wire, shape and size are not critical.<\/p>\n\n\n\n