Alarm circuit
This is a fire alarm system utilizing the IC TD2002 suite to detect fire incidents. The alarm is crucial in residential complexes, allowing for early detection. It operates by detecting fog generated by fire, which reduces the light reaching the light-dependent resistor (LDR). This reduction increases the resistance of the LDR, generating a voltage in the COB chip that activates the alarm sound. Additionally, there is a police siren circuit using the popular IC 555. The IC on the right acts as an alarm tone generator, while the IC on the left functions as a 1 Hz astable multivibrator. The output from the left IC modulates the frequency of the right IC, creating alternating frequency signals of 440 Hz and 550 Hz at a 1 Hz rotation ratio. Furthermore, an overheat detector alarm switch employs the temperature sensor IC LM35. This circuit utilizes the LM35 to provide an accurate linear output in millivolts over a temperature range of 0 to +155 degrees Celsius. The output connects to a comparator using a CA3130 op-amp, which is set with a threshold voltage via a voltage divider network. When the temperature exceeds the threshold, the comparator output goes high, activating a transistor that powers an oscillator circuit using a 555 timer, which drives a piezoelectric buzzer to produce an alert. The circuit can also control a relay for high-power devices. Additionally, a water level sensor and alarm circuit using a CD4066 indicates water levels and triggers an alarm when the tank is full. The circuit operates by closing a switch when water fills the tank, turning on LEDs and activating a buzzer when the tank is full. Lastly, a wailing alarm siren using dual 555 IC timers produces a warbling sound, suitable for toys or security alarms. The first oscillator generates the audio frequency, while the second produces a modulating signal, creating a warbling effect.
The fire alarm system based on the IC TD2002 is designed for effective detection of fire through fog and smoke. The light-dependent resistor (LDR) serves as a critical component, responding to changes in light intensity caused by smoke. The increased resistance of the LDR translates to a voltage change within the circuit, which activates the alarm, ensuring timely notification in emergency situations.
The police siren circuit illustrates the versatility of the IC 555, a well-known timer IC that can be configured in various modes. The dual configuration allows for a sophisticated sound generation system, where one IC generates a steady tone while the other modulates it, creating a realistic siren sound. The frequency modulation achieved through this setup can be adjusted by varying the capacitor values, allowing customization of the alarm tone.
The overheat detector alarm leverages the precision of the LM35 temperature sensor, which is known for its linear output characteristics. The comparator circuit, built around the CA3130 op-amp, provides a reliable method for temperature monitoring. The adjustable threshold voltage allows users to set the desired activation temperature, making this circuit adaptable for different applications. The integration of a piezoelectric buzzer ensures that the alarm is loud enough to alert individuals in the vicinity.
The water level sensor circuit using the CD4066 not only measures water levels but also provides visual and audible alerts. The use of resistors and switches ensures that the circuit remains efficient and responsive to changes in water levels. This design is particularly useful for automated water management systems.
Lastly, the wailing alarm siren circuit showcases the creative use of dual 555 timers to produce a complex sound output. The ability to change capacitor values allows for fine-tuning of the sound frequency, providing flexibility in application. This circuit can be effectively used in various security systems or as a playful addition to toys. Overall, these circuits exemplify the diverse applications of integrated circuits in safety and alarm systems.This is Fire Alarm using IC TD2002 suite, to identify if there is a fire. This alarm is very important in crowd residential complex, so that we can know earlier. This alarm works if there is a fog that generated by the fire cross the lamp and LDR sensor, so that the incoming light in LDR is reduced, this cause the resist in LDR is higher to genera te the voltage in COB chip to be on/off to make a sound/alarm. Rangkaian ini adalah Sirine Mobil Polisi Negara Inggris dengan IC 555, di sini kita menggunakan IC yang paling populer di dunia, yaitu IC Clock Generator 555. IC 555 yang berada di sebelah kanan berfungsi sebagai pembangkit nada alarm, dan IC 555 yang berada di sebelah kiri berfungsi sebagai Multivibrator Astable 1 Hz.
Keluaran (output) pada IC 555 yang berada sebelah kiri adalah sebagai masukan untuk memodulasikan frekwensi terhadap IC 555 yang berada di sebelah kanan. Hal ini menyebabkan sinyal frekwensi yang dihasilkan bergantian antara 440Hz dan 550Hz dengan rasio putaran sebesar 1Hz.
This is Overheat Detector Alarm Switch using Temperature Sensor IC LM35 Electronic Suite Diagram, at the heart of this overhead detector (fire alarm) circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an accurately linear and directly proportional output in mV, over the zero to +155 degrees C temperature range. This can be used as part of fire smoke detectors but do not use it as a home fire alarm system. Here the output of the LM35 is applied to the non-inverting input of a comparator wired around a CA3130 opamp (IC2).
A voltage divider network R3-P1 sets the threshold voltage, at the inverting input of the opamp. The threshold voltage determines the adjustable temperature trip level at which the circuit is activated. When the measured temperature exceeds the user-defined level, the comparator pulls its output High to approx.
2. 2 V causing transistor T1 to be forward biased instantly. T2 is also switched on, supplying the oscillator circuit around IC3 with sufficient voltage to start working. The 555 set up in astable mode directly drives active piezoelectric buzzer Bz1 to raise a loud alert.
Components R7, R8 and C4 determine the on/off rhythm of the sounder. A transistor based relay driver may be driven off the emitter of T1 (TP1). Similarly, replacing the piezo sounder with a suitable relay allows switching of high-power flashers, sirens or horns working on the AC mains supply. This is Water Level Sensor and Alarm Circuit using CD4066 Circuit Schematic, forcircuit not only indicates the amount of water in the tank head, but also gives an alarm when the tank is full.
If the water is empty the wires in the tank are open circuit and the 180K resistors pulls the switch to open the little switches and LEDs are off. When the water begins to fill the first wire connected to the reservoir in the S1 and the + supply are shorted by water.
This closes the S1 and turns the LED1 ON. As the water further into the tank, LEDS2, 3 to 4 pm light gradually filled. If the water is full, the base of the transistor BC148 is pulled up with water and saturate the transistor, turning the buzzer ON. The SPST switch has to be opened to turn off the ringer. This is Wailing Alarm Siren using Dual 555 IC Timer circuit produce warbling sound, you can use it in your toys or in security alarm.
The circuit use two 555 IC oscillator. In this alarm siren circuit, the first oscillator is employed to produce audio frequency. The second oscillator is employed to produce a modulating signal. This modulating signal make this alarm siren generates warbling sound. You can try to change the capacitor C1 to change the warbling frequency. Using the component shown in the schematic diagram, this alarm siren gives 6 seconds warbling period. You can lower the C1 capacitor value to get higher warbling frequency, for example, you can try some values between 10 uF to 47 uF to get the suit
🔗 External reference
The fire alarm system based on the IC TD2002 is designed for effective detection of fire through fog and smoke. The light-dependent resistor (LDR) serves as a critical component, responding to changes in light intensity caused by smoke. The increased resistance of the LDR translates to a voltage change within the circuit, which activates the alarm, ensuring timely notification in emergency situations.
The police siren circuit illustrates the versatility of the IC 555, a well-known timer IC that can be configured in various modes. The dual configuration allows for a sophisticated sound generation system, where one IC generates a steady tone while the other modulates it, creating a realistic siren sound. The frequency modulation achieved through this setup can be adjusted by varying the capacitor values, allowing customization of the alarm tone.
The overheat detector alarm leverages the precision of the LM35 temperature sensor, which is known for its linear output characteristics. The comparator circuit, built around the CA3130 op-amp, provides a reliable method for temperature monitoring. The adjustable threshold voltage allows users to set the desired activation temperature, making this circuit adaptable for different applications. The integration of a piezoelectric buzzer ensures that the alarm is loud enough to alert individuals in the vicinity.
The water level sensor circuit using the CD4066 not only measures water levels but also provides visual and audible alerts. The use of resistors and switches ensures that the circuit remains efficient and responsive to changes in water levels. This design is particularly useful for automated water management systems.
Lastly, the wailing alarm siren circuit showcases the creative use of dual 555 timers to produce a complex sound output. The ability to change capacitor values allows for fine-tuning of the sound frequency, providing flexibility in application. This circuit can be effectively used in various security systems or as a playful addition to toys. Overall, these circuits exemplify the diverse applications of integrated circuits in safety and alarm systems.This is Fire Alarm using IC TD2002 suite, to identify if there is a fire. This alarm is very important in crowd residential complex, so that we can know earlier. This alarm works if there is a fog that generated by the fire cross the lamp and LDR sensor, so that the incoming light in LDR is reduced, this cause the resist in LDR is higher to genera te the voltage in COB chip to be on/off to make a sound/alarm. Rangkaian ini adalah Sirine Mobil Polisi Negara Inggris dengan IC 555, di sini kita menggunakan IC yang paling populer di dunia, yaitu IC Clock Generator 555. IC 555 yang berada di sebelah kanan berfungsi sebagai pembangkit nada alarm, dan IC 555 yang berada di sebelah kiri berfungsi sebagai Multivibrator Astable 1 Hz.
Keluaran (output) pada IC 555 yang berada sebelah kiri adalah sebagai masukan untuk memodulasikan frekwensi terhadap IC 555 yang berada di sebelah kanan. Hal ini menyebabkan sinyal frekwensi yang dihasilkan bergantian antara 440Hz dan 550Hz dengan rasio putaran sebesar 1Hz.
This is Overheat Detector Alarm Switch using Temperature Sensor IC LM35 Electronic Suite Diagram, at the heart of this overhead detector (fire alarm) circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an accurately linear and directly proportional output in mV, over the zero to +155 degrees C temperature range. This can be used as part of fire smoke detectors but do not use it as a home fire alarm system. Here the output of the LM35 is applied to the non-inverting input of a comparator wired around a CA3130 opamp (IC2).
A voltage divider network R3-P1 sets the threshold voltage, at the inverting input of the opamp. The threshold voltage determines the adjustable temperature trip level at which the circuit is activated. When the measured temperature exceeds the user-defined level, the comparator pulls its output High to approx.
2. 2 V causing transistor T1 to be forward biased instantly. T2 is also switched on, supplying the oscillator circuit around IC3 with sufficient voltage to start working. The 555 set up in astable mode directly drives active piezoelectric buzzer Bz1 to raise a loud alert.
Components R7, R8 and C4 determine the on/off rhythm of the sounder. A transistor based relay driver may be driven off the emitter of T1 (TP1). Similarly, replacing the piezo sounder with a suitable relay allows switching of high-power flashers, sirens or horns working on the AC mains supply. This is Water Level Sensor and Alarm Circuit using CD4066 Circuit Schematic, forcircuit not only indicates the amount of water in the tank head, but also gives an alarm when the tank is full.
If the water is empty the wires in the tank are open circuit and the 180K resistors pulls the switch to open the little switches and LEDs are off. When the water begins to fill the first wire connected to the reservoir in the S1 and the + supply are shorted by water.
This closes the S1 and turns the LED1 ON. As the water further into the tank, LEDS2, 3 to 4 pm light gradually filled. If the water is full, the base of the transistor BC148 is pulled up with water and saturate the transistor, turning the buzzer ON. The SPST switch has to be opened to turn off the ringer. This is Wailing Alarm Siren using Dual 555 IC Timer circuit produce warbling sound, you can use it in your toys or in security alarm.
The circuit use two 555 IC oscillator. In this alarm siren circuit, the first oscillator is employed to produce audio frequency. The second oscillator is employed to produce a modulating signal. This modulating signal make this alarm siren generates warbling sound. You can try to change the capacitor C1 to change the warbling frequency. Using the component shown in the schematic diagram, this alarm siren gives 6 seconds warbling period. You can lower the C1 capacitor value to get higher warbling frequency, for example, you can try some values between 10 uF to 47 uF to get the suit
🔗 External reference
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