Do you want a ready made switch or may be a DIY one ? -----Mensaje original----- De: piclist-bounces@MIT.EDU [mailto:piclist-bounces@MIT.EDU]En nombre de Dave Enviado el: Martes, 31 de Julio de 2012 04:54 p.m. Para: Microcontroller discussion list - Public. Asunto: Re: [EE] Need switch with low acoustic noise Add a short delay in the audio going out! Dwayne Reid wrote: >At 04:02 PM 7/31/2012, Roger Furer wrote: > >>Here is a link to Switchcraft Industrial Lever Switches: >>http://www.switchcraft.com/productsummary.aspx?Parent=3D527 >> >>I'm not sure how big these are, but you can read the specs yourself. >> >>One thing I'm unsure of; if it is a control voltage that is being >>switched, what kind of noise is being generated? Is there a >>prolonged contact bounce? Or is it the mechanical noise of the switch itself? > >Yeah - those Switchcraft switches are one style of the telephone >lever switches that I mentioned. Pye makes another version with >significantly less depth but they are also too long (deep) for the enclosure. > >The problem is the acoustic noise that occurs when the switch is >slammed between its end-stops. The announcer is wearing a >sportscasters broadcast headset (with cardioid mic and stereo >headphones) and the announcer box (with the switch) is only 16 or so >inches away from the mic. > >The noise is lessened when I install a rubber boot on the switch and >is eliminated if the announcer grasps the switch toggle between thumb >and forefinger, then moves it between the on and off >positions. However, the announcer doesn't like doing that - he would >rather just slam his hand up or down to operate the switch. I can't >replace the announcer, so I need to replace the switch . > >There is a slight RC delay on the control voltage that operates the >FET audio switches - this gives a rapid fade up and down of the mic's >audio rather than an abrupt change. This delay means that the noise >of the switch being turned ON is much less than that of the switch >being turned OFF. > >Unfortunately, I haven't yet figured out a way to detect that the >announcer is about to turn his mic OFF before he actually does it >. > >Thanks for the suggestions, and please keep them coming. > >dwayne > > > >-- >Dwayne Reid >Trinity Electronics Systems Ltd Edmonton, AB, CANADA >(780) 489-3199 voice (780) 487-6397 fax >www.trinity-electronics.com >Custom Electronics Design and Manufacturing > >-- >http://www.piclist.com PIC/SX FAQ & list archive >View/change your membership options at >http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .