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[JMac]

For what it's worth I did the modification in the second posted thread above, and here are my numbers for the modified SH10:

"The SH10A modification involved bypassing the piezo speaker wires and routing both to the (added) binder posts.  A diode was added to the ”circuit board-piezo speaker” (negative) wire.  This allows for a DC output to the binder posts (added to the side of the case).  The activation of the Power Horn and subsequent change in DC output to the sensitive relay will power the relay controlled outlet.  (The DC voltage of the SH10A will change from 5.73 volts to 20.57 volts with activation.)"

Not to cloud the issue - FYIO

[desi77]

I have done some of the thing suggested for Siren mod.
I will post picture of what I did for more help..
I am seeing one issue, I can measure voltages up to relay coils pins boy on out put of relay
I am not getting any voltage, what might be the reason?
Thanks

[Brian H]

A picture may help.
Like where you are measuring the voltage. Across the coil or exactly where.
You are not seeing the relay switch On the external power supply to the siren?

[desi77]

DAMN...IT didn't work...yes today i don't have to go to my part time job..i will upload pictures..
---i have two mini horns, one with mod and one without...one without mod works ....but with mod i didn't try it before moding, is not working.  Maybe i can only have on mini horn? or my first one is on A1 and second one should be at A2?

[Brian H]

The SC1200 uses two X10 Addresses. The House Code and Unit Code you set in the SC1200 and the same House Code and the Unit Code +1.
So if you are using A1 as your first address. A2 is the second one.
All of them can be on the same address, but you may want to try A2 since it is send second. May make a difference but I don't think setting them to A1 would unselected them with the A2 being sent.

[desi77]

Okay it can't be a1 or A2 issues .. Like u said
This is how I connected
--2 wires from tiny transformer (left and right)
--right wires goes to diode (black band side connected to reed relay)
-- so wire from diode is sadder with coil side and output side
---capacitor connected to (plus side) same place where diode is..coil and output
--other side of capacitor connected to other side of relay to coil only
--stay with me now it's confusing lol
---one out put of coil (not sadder to anything) it goes to my siren
----second wire from my transformer is connected to coil side(where capacitor negative is connected to relay
--- from this same place second wire goes to siren
... When I test siren with dc out put it works ... Not with my system
I will post again with picture maybe someone will catch my mistake
Thanks

[Brian H]

Are you using an external power supply for the siren?
It can not be run from the voltage on the relay coil and it sounds like that maybe what you are trying to do.
The relay coil, diode and capacitor use the voltage from the Powerhorn's siren driver.
The external siren is powered by an external power supply and switched On and Off by the relays contacts.

If you can add a photo it would help.

[desi77]

you are correct that's what i was trying to do...also i am trying to upload picture...but can't ...help?

[Brian H]

Sorry picture not showing.

[desi77]

i try few time to post picture but arent' working..
i am using "insert Image" icon but northing showing in picture...
[img ...path to my picture.../img]

[Brian H]

You may want to try the additional Options and then the attach function.

[desi77]

here is the picture but my text is too small to see now, but ask away where these wires coming from lolz

[desi77]

here is bit better pic

[Brian H]

The relay what RS part number?
The relay contacts {Outputs} can not be tied to the coil connections as the small voltage from the internal siren driver circuit will not drive the siren. An external isolated power supply is needed.
Also since the SH10A uses a AC derived power supply. Only the two Isolated Relay contacts should be routed outside of the case. The white wires from the siren driver have live AC connections through the internal electronics.

                 Diode
White wire -------->|---------Relay Coil.
                             |
                             + Capacitor
                             - Capacitor
                             |
White Wire -------------------Relay Coil
                    

                                Relay Contact ------------------- Siren +
                                Relay Contact ------------------- External Power supply +
                                External Power Supply - --------- Siren -                              

[desi77]

Brian you the man...
your diagram makes easy to do this lolz
i already connected it now i all i have to do is try it a home..
if this all works well. i`ll create new post and post this info within, for guys like me who have limited electric skills can use this info...

ps: my relay is R44-1D2-12 (IF101J)

I just tried it at home it works great 
Now I will make post of this with all info and pictures
Thanks all for help