School Bell Alarm
Review: 5 - "A masterpiece of literature" by , written on May 4, 20020
Great

School Bell Alarm

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  • Product SKU: LGKT034
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₹ 499 ₹ 599
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Highlights
  • Product Code: LGKT034
  • Technical Support: upto 30mins Video support
  • Handmade
  • Make in India
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  • 20% Deposit before shipping
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Details
  • Unsoldered PCB and all components to be soldered on PCB.
  • Includes all ICs, Connecting wires and Relay.
  • Documentation: PCB Specifications Component list and Circuit diagram.
  • Power Supply: No battery included, Includes 12 Volt DC adapter with the kit.
  • Video tutorial is available on YouTube.
  • One set of the readymade in working condition.
  • Includes all ICs, Connecting wires and Relay.
  • Documentation: PCB Specifications Component list and Circuit diagram.
  • Power Supply: No battery included, Includes 12 Volt DC adapter with the kit.
  • Video tutorial is available on YouTube.

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Specification

Description

School Bell Alarm Kits have a momentary switch. When the clerk presses it, the school bell rang according to the value of resistance and capacitance. This clock(timing) can be adjusted by changing the value of capacitor and resistance.

In the Kit Bell Alarm, we can change this ‘on’ time by changing the values of resistors and/or capacitors depending upon your requirement. The Microswitch (S1) is adjusted so that when the pen pressed the momentary switch. This press of the switch sends a logic low to the trigger pin2 of the LM555 IC which generates an active high output on pin 3. The IC is used in a mono-stable state. The value of the time for a high pulse on each trigger in the input is dependent on the value of the resistor and the capacitor. The output from the LM555 drives the ULN2803 IC (it acts as a current amplifier to meet the current requirement to drive the relay).

This Current Amplifier Circuit is an inverted IC means when the input is low output is high and vice versa. This IC LM555 drive the relay to activate the light which is a DC buzzer. The relay acts as an electromagnetic switch to switch the high voltage to activate the DC buzzer and activate the DC supply across the buzzer.


Block Diagram

School-Bell-Alarm-block-diagram

Physical Attributes

  • Dimensions (cm) L x W x H : 20 x 15 x 5
  • Weight (gm): 200

Product Video

Customer Reviews

Based on 3 reviews
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k
krishna singh
Perfect

It was neat and very easy to assemble; Everything was perfect .

T
Teja Reddy Chaganti
Loved the simplicity.

This DIY makes it a lot more easier to explain principles of electrniic.Great product

T
Teja Reddy Chaganti
Good

Good Quality