Making a much louder Lost Model Locator

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Peter Olcott - 08 Oct 2009 15:14 GMT

http://www.radioshack.com/product/index.jsp?productId=2062405
http://www.skykingrcproducts.com/accessories/lostmodel/lost_rc_model_alarm.html
I need to know how to get or make a device that feeds power
to the above 102 decibel Radio Shack siren, only when the
transmitter is turned off. The Lost Model Locator on the
next link already does this, but, this device has much less
range because it is not nearly as loud.

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Tim Wescott - 09 Oct 2009 01:19 GMT

> http://www.radioshack.com/product/index.jsp?productId=2062405
> http://www.skykingrcproducts.com/accessories/lostmodel/lost_rc_model_alarm.html
> I need to know how to get or make a device that feeds power to the above
> 102 decibel Radio Shack siren, only when the transmitter is turned off.
> The Lost Model Locator on the next link already does this, but, this
> device has much less range because it is not nearly as loud.

Use the SkyKing products for the signal processing, cut off it's sounder
and replace it with an appropriate detector/amplifier for the siren.

If you're lucky they use a piezo that just needs power, and all you'll
have to do is switch a transistor with it. If you're not lucky, they'll
give some AC signal to the piezo, and you'll have to rectify and amplify
it.

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www.wescottdesign.com

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Peter Olcott - 09 Oct 2009 01:55 GMT

>> http://www.radioshack.com/product/index.jsp?productId=2062405
>>
[quoted text clipped - 21 lines]
> rectify and amplify
> it.

Maybe if I could just understand the signals coming form the
receiver, I could hook up a relay to the very loud radio
shack siren. The siren must have 12 volts. I am a software
engineer.

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RogerN - 09 Oct 2009 11:57 GMT

>>> http://www.radioshack.com/product/index.jsp?productId=2062405
>>>
[quoted text clipped - 16 lines]
> could hook up a relay to the very loud radio shack siren. The siren must
> have 12 volts. I am a software engineer.

The signal from the receiver to the servo is a pulse that ranges from about
1mS to 2mS and the servo gets somewhere around 40-50 pulses per second,
IIRC. Perhaps a diode to resistor to charge a capacitor to a comparator
circuit would trigger when no pulses are present.

RogerN

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Peter Olcott - 09 Oct 2009 02:58 GMT

>> http://www.radioshack.com/product/index.jsp?productId=2062405
>>
[quoted text clipped - 21 lines]
> rectify and amplify
> it.

http://www.dimensionengineering.com/PicoSwitch.htm
Maybe this could work? Its output might have to be wired
through a relay so that on and off are toggled, and
hopefully lost signal is interpreted as off, thus turning
the siren on.

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Model Forum / Radio Controlled / Air Models / October 2009

Making a much louder Lost Model Locator