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datzent83

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Reply with quote  #1 
Is it possible for the K126 to be activated by a bell? Basically what I need is when someone rings the intercom/bell of my building I need the relay to short two wires and then release the short.

The video below demonstrates this by tapping sound with some other relay, but can this work with the K126 and a bell/buzzer?

https://www.electronickits.com/mini-sound-activated-switch/

Frank

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Reply with quote  #2 
The kit will trigger on any sound so if the microphone can pick up the sound from the bell/buzzer then it should work.

BTW: That is not a link to a video, just the resellers website.
datzent83

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Reply with quote  #3 
Here is the video:

Frank

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Reply with quote  #4 
Not the same kit!!!
datzent83

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Reply with quote  #5 
I realize it's not the same as your kit, but will your kit serve the same function?
Frank

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Reply with quote  #6 
Yes
datzent83

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Reply with quote  #7 
Is it possible to remove the mic and connect the pair of wires coming from the intercom directly to the board? The intercom generates a tone which is played through a speaker. There is no voltage on that pair. Its a very basic intercom like in the link below.

https://goo.gl/images/9Fw8j8
Frank

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Reply with quote  #8 
Hard to say as it depends on how the intercom output is configured.

At the least you will need to remove both the mic and resistor R8 from the K126 board.

You may also need to add a series resistor between the intercom output and K126 input rather than a direct connection. My guess is that you may also need to drop the sound level from the intercom. The adjustment on K126 is to boost the signal level from the mic but the intercom output may be too high to begin with.
datzent83

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Reply with quote  #9 
I received this kit yesterday and soldered everything according to the instructions and board layout. I plug in the 12v transformer but nothing happens. Please see photo.
board.jpg 

datzent83

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Posts: 7
Reply with quote  #10 
It turns out the adapter was bad. I found another adapter which powers on the K126. However, the relay doesn't work on voice activation. The LED just stays on no matter how much I adjust the sensitivity. Please advise.
Frank

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Reply with quote  #11 
The LED is connected to the same output (transistor Q1) as the relay. If the LED is on the relay should also be on.

I would re-check all your soldering. The above issue with the LED/relay indicates as much and the problem with sensitivity could also be related to soldering.

Please upload a photo of the solder side of the board.
datzent83

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Posts: 7
Reply with quote  #12 
Please see the back side of the board.

Attached Images
Click image for larger version - Name: image.jpeg, Views: 3, Size: 226.30 KB 

Frank

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Reply with quote  #13 
There are a few solder joints that look suspect to me. I would touch up the whole board again.

Touch up doesn't mean just adding lots of solder. A small amount so that the solder joints look shiny and smooth.
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