Alarm buzzer flashing

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Philips alarm clock Radio (AJ3231) Description: Wake up to sounds from your favorite radio station or a buzzer. Simply set the alarm on your Philips Clock radio to wake you with the radio station you last listened to or choose to wake up with a buzzer sound. When the wake up time is reached, your Philips Clock radio will automatically turn on that radio station or trigger the buzzer to sound. Wake up to your favorite radio tune or a buzzerDual alarm to wake you and your partner at different timesRepeat alarm for additional snoozeFM/MW tuner for radio enjoymentSleep timer for easy falling asleep to your favorite musicMP3 Link for portable music playbackEasy to use adjustable display brightness for comfort viewingBattery back-up ensures memory of time during power failure Specifications Output power: 100 mW RMS Antenna: MW antenna, FM antenna Alarms: radio alarm, buzzer alarm, 24 hour alarm reset, repeat alarm (snooze) Dimensionsweight: 0.9 kgdepth: 61 mmheight: 140 mmwidth: 140 mm PowerBattery type: 6F22 9VBattery voltage: 9 VNumber of batteries: 1Power type: AC Input. 1 Year Warranty.

FAST AFFORDABLE COURIER SHIPPING TO SOUTH AFRICA Descriptions: Work Voltage: 3.3-5V With fixed bolt hole for easy installation PCB Dimension: 3.3 x 1.3cm DuPont line length: 21cm Module adopts 9012 transistor drive Feature: No oscillation source, need square wave (frequency 2K-5K) to drive. Sound frequency control, you can make a "do re mi fa sol la si" effect. Pin Definitions: VCC: 3.3V-5V GND: The Ground I/O: I/O Interface of SCM Package included: 10 x Passive Buzzer Module 10 x 3pin DuPont line 10Pcs 3.3-5V Passive Buzzer Alarm Module For Arduino 10Pcs 3.3-5V Passive Buzzer Alarm Module For Arduino 10Pcs 3.3-5V Passive Buzzer Alarm Module For Arduino

Scope: Mainly used in battery (9V or 12V) voltage monitoring, simple and practical, support sound and light alarm. Features: When the buzzer low voltage will "DiDiDi" sounds and the red LED lights up, when the battery voltage rise above to the set value, buzzer will stop alarm. Size: 2.9 x 3 cm The main chip: LM358 9V Battery: When a battery over-discharge (battery voltage drops below about 8V), the red lights and the buzzer calling to achieve sound and light alarm, to achieve control battery discharge status, prevent over-discharge battery, and damage battery; 12V Battery: When a battery over-discharge (battery voltage less than 10.4V), the red lights and the buzzer calling to achieve sound and light alarm, to achieve control battery discharge status, prevent over-discharge battery, and damage battery; Advantages: With a sound and light alarm, simple and practical. The module input with reverse protection, if reverse polarity power input will not burn. But without overvoltage protection, if the input exceeds 15V, the chip above the module will burn out. Adjustment method: 9V Battery: Input 9V, the LM358 voltage adjustment between 2 feet and 4 feet to about 5.78V, the alarm voltage is 8V (we has set it before shipment, so you don't need to adjust it again). Clockwise adjustment, 2 feet and 4 feet voltage is reduced, the sensitivity increased. 12V Battery: Input 12V, The LM358 voltage adjustment between 2 feet and 4 feet to about 6.05V, the alarm voltage is 10.4V (we has set it before shipment, so you don't need to adjust it again). Clockwise adjustment, 2 and 4 feet voltage is reduced, the sensitivity increased. Package includes: 3 x Battery Over-discharge Protection Module

Scope: Mainly used in battery (9V or 12V) voltage monitoring, simple and practical, support sound and light alarm. Features: When the buzzer low voltage will "DiDiDi" sounds and the red LED lights up, when the battery voltage rise above to the set value, buzzer will stop alarm. Size: 2.9 x 3 cm The main chip: LM358 9V Battery: When a battery over-discharge (battery voltage drops below about 8V), the red lights and the buzzer calling to achieve sound and light alarm, to achieve control battery discharge status, prevent over-discharge battery, and damage battery; 12V Battery: When a battery over-discharge (battery voltage less than 10.4V), the red lights and the buzzer calling to achieve sound and light alarm, to achieve control battery discharge status, prevent over-discharge battery, and damage battery; Advantages: With a sound and light alarm, simple and practical. The module input with reverse protection, if reverse polarity power input will not burn. But without overvoltage protection, if the input exceeds 15V, the chip above the module will burn out. Adjustment method: 9V Battery: Input 9V, the LM358 voltage adjustment between 2 feet and 4 feet to about 5.78V, the alarm voltage is 8V (we has set it before shipment, so you don't need to adjust it again). Clockwise adjustment, 2 feet and 4 feet voltage is reduced, the sensitivity increased. 12V Battery: Input 12V, The LM358 voltage adjustment between 2 feet and 4 feet to about 6.05V, the alarm voltage is 10.4V (we has set it before shipment, so you don't need to adjust it again). Clockwise adjustment, 2 and 4 feet voltage is reduced, the sensitivity increased. Package includes: 10 x Battery Over-discharge Protection Module

Specifications: Color: Black Material: Plastic Power supply: EU plug cable or 2 x AAA batteries (Not included) Size: Approx. 11.5x8.5x4.4cm / 4.53x3.35x1.73'' Radio frequency: FM87.5-108MHz Dual alarm clock radio: Buzzer or radio, buzzer volume at an average while radio alarm at your preset Feature: Digital FM radio, you can store your favorite 10 channels to be easily found LED display with red backlight, easy to read and convenient to use at night When the device is on, press button on/off repeatedly to turn on the radio or mode Set the sleep function to fall asleep with the radio and the device will turn off automatically after a specified time Dual alarm clock radio with snooze function, radio alarm clock with adjustable volume and remains in the parameter Start and enjoy a beautiful day with a radio alarm clock Package includes: 1 x Digital FM Alarm Clock Radio 1 x Cable  

Feature: With simple circuit, easy soldering, this kit is very suitable for the teenagers to learn circuit and soldering. The feature of this kit is small size, high sensitivity. It uses the sound and light to finish the alarm, and it can be used to detect the temperature. In conclusion, it has high practicability Circuit introduction: The circuit of this suite is very simple, it is consisted of three triodes (two S09014 and one S9015), one active buzzer, one LED and one thermistor. Adjust the potentiometer to set the temperature threshold value, use two S9014 triode to drive the buzzer, when the temperature is higher than the threshold value, the LED lights and the buzzer alarms; when the temperature is lower than the threshold value, the LED does not light, the buzzer does not alarm. Parameter: Working voltage: DC3-5V PCB size: 21 x 30mm Schematic diagram:

5Pcs 3.3-5V Passive Buzzer Alarm Module For Arduino Descriptions: Work Voltage: 3.3-5V With fixed bolt hole for easy installation PCB Dimension: 3.3 x 1.3cm DuPont line length: 21cm Module adopts 9012 transistor drive Feature: No oscillation source, need square wave (frequency 2K-5K) to drive. Sound frequency control, you can make a "do re mi fa sol la si" effect. Pin Definitions: VCC: 3.3V-5V GND: The Ground I/O: I/O Interface of SCM Package included: 5 x Passive Buzzer Module 5 x 3pin DuPont line

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FAST AFFORDABLE COURIER SHIPPING TO SOUTH AFRICA Note: This is a DIY kit, you need to assemble it, easy to install, not supply instructions. Working principle: When no light hits the photosensitive resistor, the transistor turns on and the buzzer gets the power to start tweeting. When there is light on the photosensitive resistor, the transistor is turned off, the buzzer is powered off, stop tweet. Transistor used here as an electronic switch. Feature: Laser: 5mw Working voltage 3V Package includes: 5 x DIY Infrared Laser Kit 5Pcs DIY Infrared Laser Aiming Anti-theft Burglar Alarm Module Kit 5Pcs DIY Infrared Laser Aiming Anti-theft Burglar Alarm Module Kit 5Pcs DIY Infrared Laser Aiming Anti-theft Burglar Alarm Module Kit