Panic Button. Home Utility Circuit 23


panic-button-2This Panic Alarm helps old aged people and those who are in bed rest to catch the attention of others in case of an emergency . It generates a loud Ambulance Siren when its Button is pressed. It can also be used as a Personal alarm during travelling. If there is any threat or emergency situation, it can help you to invite the attention of others. It is too compact ,handy , battery operated and can be kept in the bag or pocket. Its cost is just Rs.80 including battery.
Designed and developed by D.Mohankumar
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Siren Generator


UM 3561 is an excellent Siren generator IC widely used in Toy applications and Surveillance systems to generate different tones. It a ROM (Read Only Memory) IC which can be operated in 2 pen cells and it functions normally down to 2.4 volts.

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Music Bell with In / Out Indicator


Here is a simple Music Bell with  In and Out indicator. The bell as well as the display turns on for 2 minutes and stop automatically. The circuit uses the popular ROM IC UM66 to generate music tone and a common cathode 7 segment display to show In or Out.

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Siren Generator


UM 3561 is an excellent Siren generator IC widely used in Toy applications and Surveillance systems to generate different tones. It a ROM (Read Only Memory) IC which can be operated in 2 pen cells and it functions normally down to 2.4 volts. Using only a few components, it is very easy to construct a siren generator. The IC is designed to generate sirens like Police siren, Ambulance siren, Fire brigade siren and Machine gun sound.

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