The circuit was constructed using a few components that is powered by a 9 V battery for sensing the presence of bugs transmitting within the frequency modulation range. Frequency Modulation (FM) – ...

Fig. 1: A simplified linear detector circuit of the Bose FM multiplex detector from the patent documents. Fig. 2: John Bose enjoys a hearty meal in the Alpine FM transmitter building in July, 1939.

Home Data Center “Crowdsourcing spin detection” — http://ping.fm/aGjZd by Mark Gibbs ...

At the time of original publication, the author was senior scientist at Continental Electronics. He retired in 2017. The text below is as originally published in 2010 and is provided here as an ...