Circuit, Components, Design, Electronics, Hobby Circuits, Techniques

Bread board Regulated Power Supply


You can use this multi voltage power supply for the bread board projects. Most of the circuits require regulated power supply for errorless operation. This power supply can give regulated 12V, 9V, 6V and 5 V. Charger point for battery charging and Test point for LED and Buzzer are also included.

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Circuit, Components, Design, Electronics, Energy, Home, Techniques

Load ON / OFF Indicator


This  circuit can indicate the ON / OFF status of AC Loads. Two high bright LEDs indicate the power ON and power OFF status of the load connected to the AC outlet. It is highly useful to avoid the wastage of electricity if devices like heater, electric iron, Soldering iron etc are switched on unnecessarily for long time.

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Circuit, Components, Design, Electronics, Energy, Hobby Circuits, Home, Techniques

High Bright LED Emergency Lamp


Here is a High efficiency Emergency Lamp using High bright White LEDs. It automatically turns on when power fails and turns off when power resumes. It is powered by a 6 volt 4.5 Ah rechargeable battery which can power the LEDs for a long period.

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Circuit, Design, Education, Hobby Circuits

Phase Locked Loop (PLL)


The Phase Locked Loop or PLL is a feedback system used in high quality stereo decoders, Frequency shift keying, telemetry applications, wide band FM discriminators, frequency multiplication applications etc. PLL integrated circuits are now available to minimize the component count. This note will give the working principle of PLL integrated circuits.

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