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PIC16F628 2 Input Alarm Circuit - (10,112 view(s))

Friday, July 27th, 2012
PIC16F628 2 Input Alarm Circuit - ElectroSuite.com

ElectroSuite.com – PIC16F628 2 Input Alarm Circuit. The program uses the internal 4MHz oscillator and if any other frequency is used, the timer values will need to be changed.

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PIC16F84A Alarm Clock - (8,369 view(s))

Friday, June 1st, 2012
PIC16F84A Alarm Clock - ElectroSuite.com

ElectroSuite.com – PIC16F84A Alarm Clock. This clock counts seconds, minutes, hours and day of the week. Time is displayed on 4 seven segment LED displays, and is adjustable with three buttons at start time (up, down, enter).

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Homemade GSM Car Security System - (30,536 view(s))

Tuesday, April 10th, 2012
Homemade GSM Car Security System - ElectroSuite.com

ElectroSuite.com – This Homemade GSM Car Security System super simple circuit design of a GSM car security system really works.

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SCR Alarm Circuit Exit and Entry - (5,109 view(s))

Saturday, December 10th, 2011
SCR Alarm Circuit Exit and Entry - ElectroSuite.com

ElectroSuite.com – SCR Alarm Circuit Exit and Entry. The basic alarm has a single zone with “Exit/Entry” delays. This will be adequate in many situations. However – larger buildings are better divided into zones.

SCR Alarm Circuit Exit and Entry - ElectroSuite.com
SCR Alarm Circuit Exit and Entry – schematicwiring.com

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555 Power Out Alarm - (6,907 view(s))

Wednesday, November 9th, 2011
555 Power Out Alarm - ElectroSuite.com

555 Power Out Alarm – techmag2003.tripod.com

ElectroSuite.com – 555 Power Out Alarm. This circuit can be used as a audible ‘Power-out Alarm’.

555 Power Out Alarm - ElectroSuite.com

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Fire Alarm using IC TD2002 - (5,932 view(s))

Monday, August 15th, 2011
Fire Alarm using IC TD2002

Fire Alarm using IC TD2002

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 generate the voltage in COB chip to be on/off to make a sound/alarm.

The alarm / sound amplified by the IC Amplifier of TDA2002 to gain the sound higher.

Fire Alarm using IC TD2002

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Sirine Mobil Polisi Negara Inggris dengan IC 555 - (12,376 view(s))

Tuesday, July 26th, 2011
Sirine Mobil Polisi Negara Inggris dengan IC 555

Sirine Mobil Polisi Negara Inggris dengan IC 555

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.

Transistor 2N3055 berfungsi untuk membantu memperkuat sinyal ke speaker.

Sirine Mobil Polisi Negara Inggris dengan IC 555
Sumber : http://home.roadrunner.com/~randylinscott//feb21.htm

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Overheat Detector Alarm Switch using IC LM35 - (7,475 view(s))

Thursday, July 21st, 2011
Overheat-Detector-Alarm-Switch-using-Temperature-Sensor-IC-LM35

Overheat Detector Alarm Switch using IC LM35

This is Overheat Detector Alarm Switch using IC LM35 electro suite. The LM35 series are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature.

Features

  • Calibrated directly in ° Celsius (Centigrade)
  • Linear + 10.0 mV/°C scale factor
  • 0.5°C accuracy guaranteeable (at +25°C)
  • Rated for full −55° to +150°C range
  • Suitable for remote applications
  • Low cost due to wafer-level trimming
  • Operates from 4 to 30 volts
  • Less than 60 μA current drain
  • Low self-heating, 0.08°C in still air
  • Nonlinearity only ±1⁄4°C typical
  • Low impedance output, 0.1 W for 1 mA load

Components

  • R1 = 1k
  • R2, R4 = 12k
  • R3 = 10k
  • R5 = 2k2
  • R6 = 1M
  • R7 = 220k
  • R8 = 22k
  • P1 = 10k
  • C1, C4 = 10µ/16V
  • C3 = 1µ/16v
  • C5 = 47µ/16v
  • C6 = 100µ/16v
  • IC1 = LM35
  • IC2 = CA3130
  • IC3 = LMC555
  • BZ1 = Buzzer 5v
  • T1, T2 = BC547

Pin Configuration

 

Electro Suite

Overheat-Detector-Alarm-Switch-using-Temperature-Sensor-IC-LM35
Created by P. Marian

Source

  • http://www.national.com/ds/LM/LM35.pdf
  • http://electroschematics.com

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Overheat Detector Alarm Switch using Temperature Sensor IC LM35 - (1 view(s))

Friday, July 8th, 2011

Overheat Detector Alarm Switch using Temperature Sensor IC LM35

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.
The LM35 develops an output voltage of 10 mV/K change in measured temperature.
Designed to draw a minimal current of its own, the LM35 has very low self heating in still air.

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.

Overheat Detector Alarm Switch using Temperature Sensor IC LM35

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Water Level Sensor and Alarm Circuit using CD4066 - (1 view(s))

Thursday, July 7th, 2011

Water Level Sensor and Alarm Circuit using CD4066

This is Water Level Sensor and Alarm Circuit using CD4066 Circuit Schematic, for circuit not only indicates the amount of water in the tank head, but also gives an alarm when the tank is full.

This circuit uses the widely available to show IC number CD4066 bilateral switch CMOS IC to the water level through LEDs.
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.
No. Levels of the display to 8 if 2 can CD4066 ICs are used to increase similarly.

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.
Remember, the switch ON while pumping water otherwise the buzzer does not sound!

Water Level Sensor and Alarm Circuit using CD4066

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Wailing Alarm Siren using Dual 555 IC Timer - (1 view(s))

Wednesday, July 6th, 2011

Wailing Alarm Siren using Dual 555 IC Timer

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 suitable effect. This alarm siren circuit works with 5-15V power supply, but note that the 555 IC would suffer a significant self-heating when you use 12 volts or higher, and this may cause a shorter lifetime for the 555 IC chip.

Wailing Alarm Siren using Dual 555 IC Timer

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