Connect this circuit to any of your home appliances (lamp, fan, radio, tc) to make the appliance turn on/off from a TV, VCD or DVD remote control. The circuit can be activated from up to 10 metres. The 38kHz infrared (IR) rays generated by the remote control are received by IR receiver module TSOP1738 of the circuit. Pin 1 of TSOP1738 is connected to ground, pin 2 is connected to the power supply through resistor R5 and the output is taken from pin 3. The output signal is amplified by transistor T1 (BC558).
Saturday, March 5, 2011
Brake Failure Indicator
Do you want to get an early warning of brake failure while driving? Here is a brake failure indicator circuit that constantly monitors the condition of the brake and gives an audio-visual indication. When the brake is applied, the green LED blinks and the piezobuzzer beeps for around one second if the brake system is intact. If the brake fails, the red LED glows and the buzzer stops beeping. The circuit will work only in vehicles
with negative grounding. It also gives an indication of brake switch failure. In hydraulic brake systems of vehicles, a brake switch is mounted on the brake cylinder to operate the rear brake lamps.
Friday, March 4, 2011
USB Power Socket
Today, almost all computers contain logic blocks for implementing a USB port. A USB port, in practice, is capable of delivering more than 100 mA of continuous current at 5V to the peripherals that are connected to the bus. So a USB port can be used, without any trouble, for powering 5V DC operated tiny electronic gadgets.
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Do you want to get an early warning of brake failure while driving? Here is a brake failure indicator circuit that constantly monitors the... -
Today, almost all computers contain logic blocks for implementing a USB port. A USB port, in practice, is capable of delivering more than 1... -
Connect this circuit to any of your home appliances (lamp, fan, radio, tc) to make the appliance turn on/off from a TV, VCD or DVD remote c...