Monday, August 11, 2014
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Fire Alarm
. This schema warns the user against fire accidents. It relies on the smoke that is produced in the event of a fire. When this smoke passes between a bulb and an LDR, the amount of light falling on the LDR decreases. This causes the resistance of LDR to increase and the voltage at the base of the transistor is pulled high due to which the supply to the COB (chip-on-board) is completed. Different COBs are available in the market to generate different sounds.
The choice of the COB depends on the user. The signal generated by COB is amplified by an audio amplifier. In this schema, the audio power amplifier is wired around IC TDA 2002. The sensitivity of the schema depends on the distance between bulb and LDR as well as setting of preset VR1. Thus by placing the bulb and the LDR at appropriate distances, one may vary preset VR1 to get optimum sensitivity.
An ON/OFF switch is suggested to turn the schema on and off as desirable.
Right click and see the image
Fire Alarm
The choice of the COB depends on the user. The signal generated by COB is amplified by an audio amplifier. In this schema, the audio power amplifier is wired around IC TDA 2002. The sensitivity of the schema depends on the distance between bulb and LDR as well as setting of preset VR1. Thus by placing the bulb and the LDR at appropriate distances, one may vary preset VR1 to get optimum sensitivity.
An ON/OFF switch is suggested to turn the schema on and off as desirable.
Right click and see the image
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