Showing posts with label Alarm Indicator. Show all posts
Showing posts with label Alarm Indicator. Show all posts
Thursday, October 27, 2011
Doorbell Sound with CD4001 CD4060
The doorbell sound circuit was two-tone sound. With the switch S1. working of the circuit, IC1 is a frequency division circuit, and a sound frequency generator came out.by C1, R1 is the frequency generator.
This audio signal from pin 7 and pin 4 to pin 1 and pin 8 of the IC2a, IC2c respectively. The IC2b of a frequency converter to control IC2c.When control signal during the low (Low) 1.25 kHz frequency coincides with IC2a.At same time, the control signal is in a high state IC2b (high) , 300 Hz frequency IC2c parties. Output on pin 3 of low IC2a under the same conditions, production and IC2c IC2a IC2d.Which is sent to act as a signal and the output transistors act as switches Q1 and tones amplifiers.The can be heard as two strokes. R3 acts as a volume, add more value to make the softest sound, but softer, a source of 6 volts.
This audio signal from pin 7 and pin 4 to pin 1 and pin 8 of the IC2a, IC2c respectively. The IC2b of a frequency converter to control IC2c.When control signal during the low (Low) 1.25 kHz frequency coincides with IC2a.At same time, the control signal is in a high state IC2b (high) , 300 Hz frequency IC2c parties. Output on pin 3 of low IC2a under the same conditions, production and IC2c IC2a IC2d.Which is sent to act as a signal and the output transistors act as switches Q1 and tones amplifiers.The can be heard as two strokes. R3 acts as a volume, add more value to make the softest sound, but softer, a source of 6 volts.
Monday, August 15, 2011
Doorbell circuit using NE555 IC
The main part of this circuit Doorbell two timer NE555 ICs.When someone hit the switch S1 momentarily, the speaker emits a sound of the bell, if the time period of the monostable multivibrator built around IC1.
When the switch S1 pressed, IC1 is enabled in your pin 2 and pin 3 output is high for a period of time previously set by the values of R4 and POT POT R5.When ofIC1 restores the IC2 output is high and starts to swing to make a bell sound through the speaker.The IC2 is configured as an astable multivibrator whose oscillation frequency can be varied with the help of POT R5.By adjusting the values of R4 and R5, changes in tone are possible
Notes.
- The circuit has to assembled on a good quality PCB or common board.
- The IC1 & IC2 has to be mounted on IC holders.
- Power the circuit from a 9V battery or 9V DC power supply.
- Switch S1 is push button switch.
Tuesday, June 28, 2011
Simple Door Alarm circuit
Simple Door Alarm circuitThis is a simple - easy to build - alarm circuit. For power - I used a small 9-volt battery. But the circuit itself will work from 5 to 15-volts - just choose a buzzer that's suitable for the voltage you're using. The standby current is virtually zero - so the battery life is good.
If SW1 is fitted to a door - every time the door opens the Buzzer will give a short beep. In an unattended shop - or reception area - the sound of the beep will alert you to the fact that you have a customer. How long the output lasts depends on the values of R2 and C2. With the values shown - it will last for somewhere between 3 and 5 seconds.
But - by increasing these values - you can achieve an output time of up to half-an-hour or more. So if you replace the Buzzer with a relay - and use the relay to switch a Siren - you have a Simple Intruder Alarm that you can fit almost anywhere.
I've drawn SW1 as a magnetic-reed switch; but you can use any type of switch that suits your application. If you have more than one door or window to protect - you can use more than one switch. Just wire all of your switches in series.
Changing the Output Time
Generally speaking - the length of the output time is proportional to the values of R2 and C2. In other words, if you double the value of either R2 or C2 - you will double the output time. If you halve the value of either R2 or C2 - you will halve the output time.
For example, if you replace R2 with a 4M7 resistor you will increase the output time by a factor of about 5. If you replace C2 with a 470uF capacitor you will increase the output time by a factor of about 100. If you use both a 4M7 resistor and a 470uF capacitor together, you will increase the time by a factor of about 5 X 100 = 500. This should give you an output of around half-an-hour or more.
If you want an accurate output time - use a variable-resistor (or preset) in place of R2. Then simply adjust the resistor until you get the output time you require.
Via : www.circuitdb.com
If SW1 is fitted to a door - every time the door opens the Buzzer will give a short beep. In an unattended shop - or reception area - the sound of the beep will alert you to the fact that you have a customer. How long the output lasts depends on the values of R2 and C2. With the values shown - it will last for somewhere between 3 and 5 seconds.
But - by increasing these values - you can achieve an output time of up to half-an-hour or more. So if you replace the Buzzer with a relay - and use the relay to switch a Siren - you have a Simple Intruder Alarm that you can fit almost anywhere.
I've drawn SW1 as a magnetic-reed switch; but you can use any type of switch that suits your application. If you have more than one door or window to protect - you can use more than one switch. Just wire all of your switches in series.
Changing the Output Time
Generally speaking - the length of the output time is proportional to the values of R2 and C2. In other words, if you double the value of either R2 or C2 - you will double the output time. If you halve the value of either R2 or C2 - you will halve the output time.
For example, if you replace R2 with a 4M7 resistor you will increase the output time by a factor of about 5. If you replace C2 with a 470uF capacitor you will increase the output time by a factor of about 100. If you use both a 4M7 resistor and a 470uF capacitor together, you will increase the time by a factor of about 5 X 100 = 500. This should give you an output of around half-an-hour or more.
If you want an accurate output time - use a variable-resistor (or preset) in place of R2. Then simply adjust the resistor until you get the output time you require.
Via : www.circuitdb.com
Monday, May 30, 2011
Audio Light Modulator Schematic Circuit
Audio Light Modulator Schematic CircuitAudio ablaze modulations add to the amusement of music during functions organised at home or outdoors. Presented actuality is one such simple ambit in which ablaze is articulate application a baby atom of the audio achievement from the apostle terminals of the audio amplifier. The achievement from the apostle terminals of audio amplifier is affiliated to a agent (output agent acclimated in transistor radios) through a non-polarised capacitor.
The use of agent is capital for isolating the audio antecedent from the ambit in The acuteness ascendancy potentiometer VR1 provided in the ascribe to transistor T1 may be adapted to ensure that advice takes abode alone afterwards the AF exceeds assertive amplitude. This ascendancy has to be adapted as per audio antecedent level. The audio arresting Proper earthing of the ambit is absolutely essential. The diode arch provides pulsating DC achievement and acts as a bouncer ambit amid the mains ascribe and pulsating DC output. Extreme affliction is all-important to abstain any electric shock
The use of agent is capital for isolating the audio antecedent from the ambit in The acuteness ascendancy potentiometer VR1 provided in the ascribe to transistor T1 may be adapted to ensure that advice takes abode alone afterwards the AF exceeds assertive amplitude. This ascendancy has to be adapted as per audio antecedent level. The audio arresting Proper earthing of the ambit is absolutely essential. The diode arch provides pulsating DC achievement and acts as a bouncer ambit amid the mains ascribe and pulsating DC output. Extreme affliction is all-important to abstain any electric shock
Saturday, April 23, 2011
Alarm Water Level Indicator
Alarm Water Level Indicator CircuitThis ambit not alone indicates the bulk of baptize present in the aerial catchbasin but additionally gives an anxiety back the catchbasin is full.
The ambit uses the broadly accessible CD4066, mutual about-face CMOS IC to announce the baptize akin through LEDs.
When the baptize is abandoned the affairs in the catchbasin are accessible circuited and the 180K resistors pulls the about-face low appropriately aperture the about-face and LEDs are OFF. As the baptize starts bushing up, aboriginal the wire in the catchbasin affiliated to S1 and the + accumulation are shorted by water. This closes the about-face S1 and turns the LED1 ON. As the baptize continues to ample the tank, the LEDs2 , 3 and 4 ablaze up gradually.
The no. of levels of adumbration can be added to 8 if 2 CD4066 ICs are acclimated in a agnate fashion.
When the baptize is full, the abject of the transistor BC148 is pulled aerial by the baptize and this saturates the transistor, axis the buzzer ON. The SPST about-face has to be opened to about-face the buzzer OFF.
Remember to about-face the about-face ON while pumping baptize contrarily the buzzer will not sound!
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