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VOX- Voice operated Relay with mods.

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amdx
Guest

Fri Aug 17, 2018 9:45 pm   



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, >
http://www.deserthound.com/amateur-radio/vox.html
Can someone tell me what the LS input is? Define LS.
It might be useful because where the phone is will probably have the
TV audio playing. (I think that starts another project TV audio to that
input) I can probably get around that by good placement.
So the phone ring triggers the mic amp and the detector then triggers
the 556 two tone oscillator.
> http://www.circuitstoday.com/dual-tone-train-horn-circuit

Any thought, simplification?
I can probably just use the first part of the VOX circuit.

Mikek

Jasen Betts
Guest

Fri Aug 17, 2018 10:36 pm   



On 2018-08-17, amdx <nojunk_at_knology.net> wrote:
Quote:
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 Smile or
substitute BC547, 2N3904, BC847 etc.

meh, leave the microphone off to avoid false triggering Smile GSM phones
emit lots of hash when they ring (or receive a text message)

Quote:
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.



--
ت

amdx
Guest

Sat Aug 18, 2018 2:45 am   



On 8/17/2018 3:36 PM, Jasen Betts wrote:
Quote:
On 2018-08-17, amdx <nojunk_at_knology.net> 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 Smile or
substitute BC547, 2N3904, BC847 etc.

Ya, I'd use what's in my junk box.


Quote:
meh, leave the microphone off to avoid false triggering Smile 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.

Quote:
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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