UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Electret microphones with very high frequency response? (~120kHz)

Andrew2 · 28th Feb 2014, 2:18 pm

Just resurrecting this thread to report that after continuing poor results with all manner of electret inserts, I ordered some 40 KHz TX and RX piezo transducers from CPC. I'm now actually getting very good sensitivity up around 40KHz plus and minus 5KHz, but of course the response drops off quickly beyond these limits.
I stuck one of the TX ones on the output of my sig gen for the initial test and almost blew the little batphone speaker to bits! Cor, it came through LOUD.
I still haven't found any 'ordinary' transducer that works over a wide range.

28th Feb 2014, 2:18 pm	#13
Andrew2 Nonode Join Date: Mar 2010 Location: Dukinfield, Cheshire, UK. Posts: 2,038	Re: Electret microphones with very high frequency response? (~120kHz) Just resurrecting this thread to report that after continuing poor results with all manner of electret inserts, I ordered some 40 KHz TX and RX piezo transducers from CPC. I'm now actually getting very good sensitivity up around 40KHz plus and minus 5KHz, but of course the response drops off quickly beyond these limits. I stuck one of the TX ones on the output of my sig gen for the initial test and almost blew the little batphone speaker to bits! Cor, it came through LOUD. I still haven't found any 'ordinary' transducer that works over a wide range. __________________ Andy G1HBE.