Save energy by installing an Automatic lighting system in your home. Connect the external lights to the system, so that it turns on the lights in the evening and turns off in the morning. No daily switching is needed and, it will light the premises of home even if nobody is there. It is too small and can be enclosed in a small plastic case.
Continue reading “Automatic Lighting System. Home Utility Circuit 6”
Sometimes we need higher sound output from Audio based circuits using either Buzzer or Speaker. This simple Transistor based Audio amplifier will give loud sound from the Speaker or Buzzer.
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This simple White LED lamp can be used in areas where little light is needed. It uses a High bright white LED and its brightness depends on the ambient light in the room. In dark, it give maximum light and in light it switches off. If the light intensity is low, it gives moderate light.
Continue reading “Varying brightness LED Lamp.Sensor Circuit 11”
This simple circuit gives an LED indication when the 6 V emergency lamp battery enters into the deep discharge state. As long as the battery voltage is above 4 volts, LED remains off and it turns on when the battery voltage drops below 4 volts.
Continue reading “Low Battery Indicator. Beginner’s Trial 10”
You can add this Simple Battery Monitor to Inverter circuit or Emergency Lamp circuit to indicate the level of battery. It can be used to monitor 6 volt or 12 volt battery. Two LED indicators are provided. Green LED lights, if the battery voltage is higher than the set level and Red LED lights when the battery voltage drops below the set level.
Continue reading “Battery Status Indicator. Design Trick 17”