T.A. Babu is an electronics consultant in Chennai, India. He holds a BSc in physics with electronics from MK University, Madurai, India. Email address: babutbabu@hotmail.com
2 results found for T.A. Babu, displaying items 1 - 2
March 26, 2009[Ideas For Design] Alarm Sounds When Refrigerator Door Remains Open Too Long
Not properly closing a refrigerator door will no doubt invite huge electricity bills. This gadget is an alert device that beeps if you leave the refrigerator door open for more than 20 seconds. When the door opens, the lamp illuminates and the IC (a 4060B counter/oscillator) starts counting down. After a preset delay of 20 seconds, the piezoelectric buzzer beeps intermittently for 20 seconds and then stops for the same amount of time. This cycle...
June 12, 2008[Ideas For Design] Switch Tricks Electronic Ballast ICs Into Working On Low Voltages
Ballast-control ICs from International Rectifier and other similar half-bridge gate drivers feature an undervoltage lockout (UVLO) on the high-side output. This function protects the driven MOSFETs or insulated gate bipolar transistors (IGBTs) in the event that VB drops to potentially dangerous low levels. When designing an electronic ballast for operation off a 12-V dc (10.5 V to 13.6 V) battery, however, the UVLO creates a challenge ...
