Flasher and siren circuits for ne555. A simple single-tone siren for notifying important events. Light controlled generator
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Chip NE555(analogue of KR1006VI1) - a universal timer, designed to generate single and repeating pulses with stable time characteristics. It is not expensive and is widely used in various amateur radio circuits. It can be used to assemble various generators, modulators, converters, time relays, threshold devices and other electronic equipment components...
The microcircuit operates with a supply voltage from 5 V to 15 V. With a supply voltage of 5 V, the voltage levels at the outputs are compatible with TTL levels.
Dimensions for different types of housings
CASE - DIMENSIONS
PDIP (8) - 9.81 mm × 6.35 mm
SOP - (8) - 6.20 mm× 5.30 mm
TSSOP (8) – 3.00 mm× 4.40 mm
SOIC (8) – 4.90 mm× 3.91 mm
NE555 block diagram
Electrical characteristics
| PARAMETER | TEST CONDITIONS | SE555 | NA555 NE555 SA555 |
UNITS MEAS. | |||||
|---|---|---|---|---|---|---|---|---|---|
| MIN | TYP | MAX | MIN | TYP | MAX | ||||
| Voltage level at THRES pin | V CC = 15 V | 9.4 | 10 | 10.6 | 8.8 | 10 | 11.2 | IN | |
| V CC = 5 V | 2.7 | 3.3 | 4 | 2.4 | 3.3 | 4.2 | |||
| Current (1) through THRES pin | 30 | 250 | 30 | 250 | nA | ||||
| TRIG pin voltage level | V CC = 15 V | 4.8 | 5 | 5.2 | 4.5 | 5 | 5.6 | IN | |
| T A = –55°C to 125°C | 3 | 6 | |||||||
| V CC = 5 V | 1.45 | 1.67 | 1.9 | 1.1 | 1.67 | 2.2 | |||
| T A = –55°C to 125°C | 1.9 | ||||||||
| Current through TRIG pin | at 0 V on TRIG | 0.5 | 0.9 | 0.5 | 2 | µA | |||
| Voltage level at the RESET pin | 0.3 | 0.7 | 1 | 0.3 | 0.7 | 1 | IN | ||
| T A = –55°C to 125°C | 1.1 | ||||||||
| Current through RESET pin | with V CC on RESET | 0.1 | 0.4 | 0.1 | 0.4 | mA | |||
| at 0 V on RESET | –0.4 | –1 | –0.4 | –1.5 | |||||
| Switching current on DISCH in closed state | 20 | 100 | 20 | 100 | nA | ||||
| Switching voltage on DISCH in open state | V CC = 5 V, I O = 8 mA | 0.15 | 0.4 | IN | |||||
| Voltage on CONT | V CC = 15 V | 9.6 | 10 | 10.4 | 9 | 10 | 11 | IN | |
| T A = –55°C to 125°C | 9.6 | 10.4 | |||||||
| V CC = 5 V | 2.9 | 3.3 | 3.8 | 2.6 | 3.3 | 4 | |||
| T A = –55°C to 125°C | 2.9 | 3.8 | |||||||
| Low output voltage | V CC = 15 V, I OL = 10 mA | 0.1 | 0.15 | 0.1 | 0.25 | IN | |||
| T A = –55°C to 125°C | 0.2 | ||||||||
| V CC = 15 V, I OL = 50 mA | 0.4 | 0.5 | 0.4 | 0.75 | |||||
| T A = –55°C to 125°C | 1 | ||||||||
| V CC = 15 V, I OL = 100 mA | 2 | 2.2 | 2 | 2.5 | |||||
| T A = –55°C to 125°C | 2.7 | ||||||||
| V CC = 15 V, I OL = 200 mA | 2.5 | 2.5 | |||||||
| V CC = 5 V, I OL = 3.5 mA | T A = –55°C to 125°C | 0.35 | |||||||
| V CC = 5 V, I OL = 5 mA | 0.1 | 0.2 | 0.1 | 0.35 | |||||
| T A = –55°C to 125°C | 0.8 | ||||||||
| V CC = 5 V, I OL = 8 mA | 0.15 | 0.25 | 0.15 | 0.4 | |||||
| High output voltage level | V CC = 15 V, I OH = –100 mA | 13 | 13.3 | 12.75 | 13.3 | IN | |||
| T A = –55°C to 125°C | 12 | ||||||||
| V CC = 15 V, I OH = –200 mA | 12.5 | 12.5 | |||||||
| V CC = 5 V, I OH = –100 mA | 3 | 3.3 | 2.75 | 3.3 | |||||
| T A = –55°C to 125°C | 2 | ||||||||
| Current consumption | V CC = 15 V | 10 | 12 | 10 | 15 | mA | |||
| V CC = 5 V | 3 | 5 | 3 | 6 | |||||
| Output low, no load | V CC = 15 V | 9 | 10 | 9 | 13 | ||||
| V CC = 5 V | 2 | 4 | 2 | 5 | |||||
(1) This parameter affects the maximum values of timing resistors R A and R B in the circuit Fig. 12. For example, when V CC = 5 V R = R A + R B ≉ 3.4 MOhm, and for V CC = 15 V the maximum value is 10 mOhm.
Performance characteristics
| PARAMETER | TEST CONDITIONS (2) | SE555 | NA555 NE555 SA555 |
UNITS MEAS. | |||||
|---|---|---|---|---|---|---|---|---|---|
| MIN. | TYPE. | MAX. | MIN. | TYPE. | MAX. | ||||
| Initial error time intervals (3) |
T A = 25°C | 0.5 | 1.5 (1) | 1 | 3 | % | |||
| 1.5 | 2.25 | ||||||||
| Temperature coefficient of time interval | Each timer, monostable (4) | T A = MIN to MAX | 30 | 100 (1) | 50 | ppm/ °C |
|||
| Each timer, astable (5) | 90 | 150 | |||||||
| Changing the time interval depending on the supply voltage | Each timer, monostable (4) | T A = 25°C | 0.05 | 0.2 (1) | 0.1 | 0.5 | %/V | ||
| Each timer, astable (5) | 0.15 | 0.3 | |||||||
| Output pulse rise time | C L = 15 pF, T A = 25°C |
100 | 200 (1) | 100 | 300 | ns | |||
| Output pulse decay time | C L = 15 pF, T A = 25°C |
100 | 200 (1) | 100 | 300 | ns | |||
(1) Conforms to MIL-PRF-38535 and has not been field tested.
(2) For conditions specified as Min. and Max. , use the appropriate value specified in the recommended operating conditions.
(3) The error of the time interval is defined as the difference between measured meaning and average value random sample from each process.
(4) Values are for a monostable circuit with the following component values R A = 2 kΩ to 100 kΩ, C = 0.1 μF.
(5) Values are for an astable circuit with the following component values R A = 1 kOhm to 100 kOhm, C = 0.1 µF.
Metal detector on one chip
Coil diameter 70-90 mm, 250-290 turns of wire in varnish insulation (PEL, PEV...), with a diameter of 0.2-0.4 mm.
Instead of a speaker, you can use headphones or a piezo emitter.
Video of this metal detector in action
Voltage converter from 12V to 24V
Toy animation
Together with counter 4017 and 555, you can make a “running fire” to animate some kind of toy or souvenir. When the power is turned on, the 555 generator starts running for just a few minutes, then turns off. At the same time, the current consumption drops - the batteries will last for a long time. The time is set with a 500 kOhm variable resistor.
Light controlled generator
Dark detector with LM555. This scheme will generate sound when light hits the Cds photo sensor.
This circuit generates alarm when The light from the sun, fire or lamp hits the LDR sensor. And the 555 has a multivibrator with a generation frequency of about 1 kHz when detecting light. When exposed to light, the sensor closes the circuit and the 555 generates oscillations around 1 kHz via open transistor BC158.
Musical keyboard
A very simple musical instrument (keyboard) for playing music can be made using a 555 chip. You can build an unusual musical instrument in the photo above. Graphite is used as a keyboard and a sheet of paper with notes is represented as holes in the paper.
The same circuit, but with ordinary resistors and buttons.
Timer for 10 minutes
The timer is started by button S1 after 10 minutes. LED1 and LED2 blink alternately. The time is set by a 550 kOhm resistor and a 150 µF capacitor.
Car alarm simulator
The LED flashes as if the car has an alarm. Install the LED in a visible place. The thief will see that the car is under alarm and will avoid it :)
A simple police siren simulator
The circuit is assembled on a breadboard.
Using two NE555s you can make a simple police siren generator. It is recommended that you make the following timer parameters: R1=68 kOhm (timer No. 1) is set to slow generation mode and the timer with R4=10 kOhm (timer No. 2) is set to fast generation mode. MYou can change the timer characteristics. The output frequency is changed by a chain of resistors R1, R2 and C1 for timer components No. 1 and R4, R5 and C3 for timer No. 2.
A similar circuit below with a transistor at the output:
Liquid Level Sound Generator
You can
Installation of collectors on the roof is usually carried out by specialists, but this work can be done on your own by purchasing a set of necessary equipment.
How to extend the “life” of a light bulb? How to repair an incandescent lamp? How to increase the service life of a flashlight?
The answer to these questions is to replace the conventional incandescent lamp with an LED. With one replacement we will immediately “kill two birds with one stone” - our new light bulb will shine and last longer. LEDs have a longer service life and lower current consumption.
Description.
This circuit is a police siren sound simulator based on NE55 Timer IC.The circuit uses two NE555 timer ICs and each of them is connected as a multivibrator. The circuit can be powered from different voltages (from 6 to 15V DC), and with the use of an additional power amplifier, you can get quite loud sound.
IC1 is connected as a low-frequency astable multivibrator with a frequency of about 20 Hz @ 50% (50% square wave) and IC2 has a higher frequency of about 600Hz. The signal from the output of the first multivibrator is connected to the voltage control input (pin5) on IC2.That is, the signal IC2 modulates the signal IC1 creating a siren effect.In simple words, the output frequency of IC2 is controlled by the output of IC1.
Notes.
* The author used 12V DC to power the circuit.
* Instead of using two NE55 timer ICs, you can also use one NE556 timer.
* NE556 is 2 NE555 ICs in one package.
*See the details of NE555 NE556 and have a clear understanding of them.
* Speaker (speaker) can be 64ohm, 500mW to 1W.
Source - http://www.circuitstoday.com/category/555-timer-ic
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This simple alarm circuit was developed for the protection of warehouses and utility rooms, garages and the like.
The alarm does not contain scarce components and can be assembled on a breadboard. The basis of the device is (IC1).
Description of the alarm operation on NE555
In this case, the timer is connected according to a one-shot circuit, which, based on a signal from the sensors, generates a control signal at the output. This signal subsequently turns on the sound generator (siren). The duration of the siren sound is regulated by variable resistor VR1 and can be up to 3 minutes.
Pin 2 of the 555 timer monitors negative signals from six sensors, which in the initial state have normally open contacts. When any of the sensors “triggered,” the capacitor is charged through its closed contacts and a series-connected diode. This results in a negative pulse appearing on pin 2 of the timer. After which, a high level voltage appears at output 3 of the NE555 timer, which leads to the activation of the electromagnetic relay RLY1.
The relay connects the sound emitter to the power source with its contacts, and the siren sounds during the entire monostable period of the timer operation. In addition, relay RLY1 also includes relay RLY2 through diode D9 and relay contacts through D10. This means that the flashes of light from the lamp (which is connected to the normally open contacts) will continue until the alarm is turned off (via a hidden switch).
At the end of the monostable period, the electromagnetic relay RLY1 will turn off and the alarm siren will turn off. The circuit will return to its original state and can again monitor the status of any of the six sensors.
Sensors can be all kinds of detectors with normally open contacts, for example, reed switches, various pressure mats, infrared detectors and glass break detectors.
http://nte-electronicscircuit.blogspot.fr/2013/01/simple-6-input-alarm.html