Tricky Charger

Here is a crude but efficient charger for Lead Acid Battery. It uses a 12 volt car bulb as current regulator and charge status indicator. The brightness of the bulb indicates how much charge is flowing into the battery. When the battery becomes fully charged, lamp turns off. If the lamp is staying on with full brightness for more than 30 minutes, it indicates that the battery is dead and is not accepting charge.
Tricky Charger

Posted in Chargers, Circuits, Hobby Circuits, Home projects, Power supply | Tagged , | 1 Comment

Low cost Pilot Lamp

This is the simple way to connect an LED in the Mains to use it as a pilot lamp. It takes little current compared to a neon lamp. It can power low efficiency as well as high efficiency LEDs including White and Blue LEDs.
Low cost Pilot Lamp

Posted in Circuits, Hobby Circuits, Home projects, Indicators, LED | Tagged , | 2 Comments

Solar Inverter Battery Charger

Here is an Energy saving battery charger. It harvests solar energy to replenish 12 volt Inverter battery. It has auto cut off facility to stop charging when the battery attains full charge. The charger uses a 24 volt solar panel as input
Solar charger with Cut off

Posted in Chargers, Hobby Circuits, Home projects, Power supply | 9 Comments

Solar Charger Circuit

Here is a circuit to charge Lead Acid or NiCd batteries using solar energy. The circuit harvests solar energy to charge a 6 volt 4.5 Ah rechargeable battery for various applications. The charger has Voltage and Current regulation and Over voltage cut off facilities.


Posted in Chargers, Hobby Circuits, Home projects, Power supply | 3 Comments

Traffic Alert

This Solar based LED flasher can Alert vehicles in heavy traffic areas or places where road work is going on. It is fully automatic and turns on in the evening. During day time it remains off and charge the battery using solar energy

Posted in Circuits, Higher level Projects, Hobby Circuits, IC4060, Indicators, Protectors | Leave a comment

Telephone Status Indicator

This simple circuit tells you about status of phone such as Line OK, Dialing and Call attended. It also has a lock facility to block outgoing calls keeping the incoming calls as usual. This prevents misuse of telephone. The circuit uses only a few components to do all these jobs
Telephone Status Indicator

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Telephone Lamp

Here is a White LED Lamp that turns on when the telephone rings. The cool white light helps to locate the phone in darkness and also helps to note the message or telephone number. The lamp remains on for three minutes then turns off

Posted in 555 Timer, Hobby Circuits, Home projects, LED, Light | Leave a comment

Power Factor Correction

Power factor correction is the method to reduce the lagging power factor in inductive loads by fixing a high value capacitor across the phase and neutral close to the load. When the Voltage and Current are in phase with each other in an AC circuit, the energy from the source is fully converted into another form to drive the load and in this case power factor is in unity. When the power factor drops, the system becomes less efficient. As a rule a drop from unity to 0.9 in the power factor increases the current requirement to 15% or more.
Article in Word format
Power Factor Correction

Posted in Components, Power supply, Theory | Tagged , | 1 Comment

Solar Powered LED

Here is the simple solution to make an automatic solar powered lamp. It automatically switches on two high power White LEDs in the evening and stays on for 6 hours using a 6 volt 4.5 Ah rechargeable battery.

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Posted in Chargers, Higher level Projects, Hobby Circuits, Home projects, LED, Light, Power supply | Tagged , , | 9 Comments

High power LED

Here is a High power White LED lamp that gives ample light in a room. It is an energy saving lamp and consumes very little power to give sufficient light. The lamp is directly powered from AC hence it is compact and easy to fix inside the switch board box.

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Posted in Circuits, Hobby Circuits, Home projects, LED, Light | Tagged , , | 8 Comments