remote controlled alarm circuit schematic

Remote Controlled Alarm circuit

A very interesting remote controlled alarm circuit using TSOP1736. Routing of an electric cable to attach a calling bell switch near the bed of an old age/patient is not a good idea. Here is an ultra simple battery operated remote controlled alarm to help old age members/patients in bed, especially at home/hospital. Any tv/video infrared remote control handset (36Khz) can be used to arm the alarm!

How does the remote controlled sound alarm works

At the heart of the circuit is the popular integrated infrared sensor TSOP1736.The TSOP1736 is a miniaturized receiver for infrared remote control systems. PIN diode and preamplifier are assembled on lead frame, the epoxy package is designed as an infrared filter. Further, a bandpassfilter, an integrator stage and an automatic gain control are used to suppress unwanted noise disturbances.

When a person needs immediate attention of someone, he should firmly press and hold any button in the keyapad of the remote control handset and aim the handset towards the sensor (IRRX) of the alarm circuit.

tsop1736 7805Instantly, the active piezo-buzzer stars beeping in tune with the modulated infrared signals emitted by the handset. Sametime, a good visual alert is provided by the red colored 10mm LED(D2).

After construction, enclose the whole remote controlled siren unit in a transparent cabinet with the Infrared sensor at the front side of the box. Now power the circuit through a suitable 9V compact alkaline battery. Insertion of an ordinary on/off toggle switch in the positive rail is a good idea. After successful testing, mount the unit in a proper point at the wall of the room/hall, as per the requirement. Finally, the lab prototype is connected to a multidirectional 5V dc buzzer. However, you can use an ordinary 5V dc buzzer or any kind of 5V active piezo-sounder.

Remote Controlled Audio Alarm Circuit Schematic

remote controlled alarm circuit schematic


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  • Dheeraj

    Where’s the sensor and remote in the circuit??

  • Arun

    Hi, i wanted to understand ur circuit. I could understand all other things except these two:

    1. Reason for placing diode between TSOP and transistor.
    A controlling current must flow from TSOP to txr.Wouldnt it be blocked by a reverse biased diode?

    2. What is the role of variable capacitor placed across TSOP?

    pls reply…

  • Name *

    if one time buzzer works, can we use,remoet to stop it

  • J. Muffalo

    I am a novice to most aspects of electronics, circuit building, schematics and much of the terminology. I have a fingernail grasp of things such as resistors, capacitors, diodes their properties and role in a given circuit from when I got my HAM Radio license. Fortunately I recently found what I think is a great web site called who provide, free of charge(so far), what seem to be fairly comprehensive tables of such things as Electrical symbols and electronic circuit symbols. Here’s their Home address and the url of the page with electrical info: if anyone’s interested.
    I really love your Electro Schematics web site. I want to get started, as soon as possible getting hands on practice building circuits of my own. I have a dream of developing some ideas for practical inventions and tools that have been on the back burner for years until I could find a collaborator to help with the electrical controller aspect which has stymied me for so long. As a beginner, I’m unsure where to start. That is, in terms of self training via hands-on circuit building, which of the hundreds of projects should I embark upon? I’m interested in alarms so I think I’ll just try to find something that looks interesting and go for it. Any suggestions?

  • vikaschavan7

    can i use TSOP1738 IR RX

  • shrey kesarwani

    can we operate this circuit with any remote? aur isme koi programming ki to zaroorat nhi padegi na? aur ye diode D1(1N4148) ye normal p-n diode he hai na?

  • bet

    great post i just got in to remote controlled vehicles myself!

  • monika

    means where’s the circuit pf remote??
    please reply on my email i.d.

  • monika

    means where’s the circuit pf remote??
    please reply on my email i.d.

  • sandy


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