From: nojunk@knology.net   
      
   On 8/17/2018 3:36 PM, Jasen Betts wrote:   
   > On 2018-08-17, amdx  wrote:   
   >> I'm starting to develop a VOX circuit to solve the following problem.   
   >>    Wife got new smart phone after flip phone went in water. We're on a   
   >> boat. Wife's phone is inside now, she's outside working, can't hear the   
   >> phone ring. Won't take the phone outside, I think she thinks she paid   
   >> $0.01 for the flip phone and $200 for the smart phone and won't take a   
   >> chance with it.   
   >>    So I want to build a VOX, it will hear the phone ring and turn on an   
   >> oscillator to drive an already outdoor speaker. Two tone would be nice.   
   >>    So mic amp, This looks good,   
   >   
   > BC109 that's an old one! still available from central though :) or   
   > substitute BC547, 2N3904, BC847 etc.   
   >   
     Ya, I'd use what's in my junk box.   
      
   > meh, leave the microphone off to avoid false triggering :) GSM phones   
   > emit lots of hash when they ring (or receive a text message)   
   >   
      
   My try that, I know my cellphone sure messes with my fm radio when   
   I have them both.   
      
   >> http://www.deserthound.com/amateur-radio/vox.html   
   >>    Can someone tell me what the LS input is? Define LS.   
   >   
   > Loudspeaker level signal that "kills sensitivity" to   
   > avoid false triggering when used on a transceiver.   
   >   
   >   
   >   
      
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