I'd really prefer a ready-made switch. This is professional=20 equipment and it needs to look that way. dwayne At 06:15 PM 7/31/2012, Nily wrote: >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 > >-- >http://www.piclist.com PIC/SX FAQ & list archive >View/change your membership options at >http://mailman.mit.edu/mailman/listinfo/piclist --=20 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 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .