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PH508 modification to triger wirelessly an outdoor siren

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GPL:
The X10 security system lacks a strong outdoor siren/strobe device. To overcome this problem I modified a PH508 Power Horn to drive wirelessly one or more outdoor sirens when it is triggered by the X10 security console.
To do so I made a circuit that takes the signal that drives the horn piezo elements. After the signal is rectified and filtered,  it turns on a transistor which acts as a solid state relay and provides power to an RF transmitter module. The module transmits a coded signal, as long as the PH508 is activated, i.e. as long the PH508 is sounding .
In case you would like to use a wired siren, you can connect a relay instead of a TX Module and use its contacts to activate the siren.
A correspondent  relay receiver,  receives the signal and after decoding  turns on a relay that can trigger an outdoor strobe/siren or any other device you would like.
I have installed two of those receiver modules into two sirens in my house and work flawlessly since  some years.
The RF modules are bought from Ebay. The transmitter works with a SAW oscillator and the receiver is a super heterodyne one. The set provides a good range, far better compared to the X10.
Three wires are soldered on the PH508 printed circuit board as shown. The provide power (5V and ground) and the sound signal to the added driver and transmitter circuit.
The driver circuit is made of a small PCB. Some parts are soldered on the other side.
The added boards are mounted in the spare space inside the power horn.
A relay receiver module is mounted inside a strobe/siren.

Moose:
Are there supposed to be photos with this post? I do not see them? ???

Brian H:
There are no photos attached. It looked like the photos where in supposed to be in the middle of the post text.

It does sound like there should have been some.

Not sure if photos in between the text lines is OK.

Newbie status has some limitations. I believe attached photos is one of them or they where too large. I thought you got a warning about that when trying to attach photos and it didn't happen.

GPL:

--- Quote from: Moose on June 16, 2020, 02:18:33 PM ---Are there supposed to be photos with this post? I do not see them? ???

--- End quote ---
I am sorry for the problem. I have seen the photos in the preview but they were probably available to me but not in public view.
I made a change and now anyone can see them.

Moose:
That is what I thought might have happened. Stumbled upon it once before on a different forum. :) ;)

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