At 03:08 PM 7/30/2012, Nily wrote: >Could we know its intended use. AC, DC, audio switching ? The switches control low-current DC control voltages into the=20 solid-state audio switches. I don't recall, but I think that the=20 control voltage currents are somewhere between 100uA through 1mA=20 (really don't remember, but my favorite pull-up or pull-down resistor is 10= K). dwayne >-----Mensaje original----- >De: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]En nombre de >Bob Ammerman >Enviado el: Lunes, 30 de Julio de 2012 01:54 p.m. >Para: Microcontroller discussion list - Public. >Asunto: Re: [EE] Need switch with low acoustic noise > > >You might even be able to find a push on/push off key switch like the old >CAPS LOCK. Some of these even have an LED in them to indicate the down >state. > >-- Bob Ammerman >RAm Systems > >----- Original Message ----- >From: "peter green" >To: "Microcontroller discussion list - Public." >Sent: Monday, July 30, 2012 4:41 PM >Subject: Re: [EE] Need switch with low acoustic noise > > > > Dwayne Reid wrote: > >> One option I have been considering is to replace the toggle switch > >> with a keyboard switch module. These are highly reliable pushbutton > >> switches that were designed for use in computer keyboards before the > >> current keyboard designs came along. I would then just add an > >> electronic alternate-action circuit with indicator LED to show that > >> the mic was live. > >> > >> I've used these keyboard switches as pushbuttons for similar purposes > >> in years gone by but I simply don't have enough of them around and > >> I'm pretty sure that they have been obsolete for a couple of decades. > >> > > Conventional keyboard switches are still made, some people preffer the > > feel > > of mechanical keyboards and there are also applications wherecustom > > keyboards are needed and the volume is too small to jusitfy the complex > > mouldings that current keyboards use. > > > > http://www.cherrycorp.com/english/switches/key/mx.htm > > -- > > 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 > > >----- >No virus found in this message. >Checked by AVG - www.avg.com >Version: 2012.0.2197 / Virus Database: 2437/5165 - Release Date: 07/30/12 > >-- >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 .