N.O. triggered sirin: what do I need to trigger on signal?

Question

I am looking at triggering any number of low voltage devices from simple alarm contacts, yet I do not know the name of what I need.

It needs to have 2 separate circuits, 1 for signal and 1 for outputting 9-24v DC when the signal circuit is closed.

Thank you.

jw0752 · Answer

Hi Pastor,

Here are a couple of simple circuits. This first one will sound the alarm as long as the sensor switch is activated.

This second circuit will latch and continue to power the alarm until the Reset Switch is pushed. Both of these circuits use the same power supply for the sensor and the output device.

John

jw0752 · Answer

Hi Pastor, For safety sake you should have the low voltage supply powered from your mains using something like an AC adapter. This will isolate the high voltage from your system. Then the simplest arrangement would be to use a relay in series with your switch and low voltage power supply. The relay could then control a different circuit with a different voltage. If the voltage of your lights and cymbal monkey are the same as the low voltage circuit just eliminate the relay and put the cymbal monkey in series with the N/O switch and the power supply. Since I do not know your level of expertise it is difficult to describe in more detail. You mentioned an IR detector which would make the system more complicated as the sensor would need support circuitry to act as a proper switch. To get the best information you may want to check out these instructions for submitting a question that shabaz wrote to help with clarification of presented questions. How to Ask Questions using the Create Discussion tool John

jw0752 · Answer

Hi Pastor, Here is a circuit that I used to demonstrate the function of a Parallax Brand PIR (Passive Infra Red Sensor). The PIR in this circuit is powered with 5 volts and therefore a 5 volt voltage regulator 7805 is required. The sensor measures the temperature of its sensor area. Once the sensor field is stable the sensor will reset and the output will go to 0 volts. If the temperature changes due to someone or something moving in the sensor field the output of the sensor will go high to 5 volts and this in turn will turn on the MOSFET which will turn on the load. The alarm will sound until the sensor field is once again stable. Newark listing of the PIR: http://www.newark.com/parallax/555-28027/pir-sensor-180-degree-sensor/dp/11X5850?ost=Parallax+PIR&selectedCategoryId=&categoryName=All+Categories&categoryNameResp=All%2BCategories Schematic of PIR Circuit: John

N.O. triggered sirin: what do I need to trigger on signal?

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