Power Supply Box

This Power supply box can be used to interface with the High current Bench power supply made from the SMPS of Computer. The Power supply box has a DC-DC Converter cum Booster module, A Volt Meter and an Ammeter to show output voltage and current consumed by the load. Continue reading “Power Supply Box”


Battery Chargers. Design Note 32

IMAGEPresenting here three circuits to make efficient Battery chargers. The 12 volt Lead Acid Car battery requires high current for fast charging. If we provide high current, the battery will charge within 1-2 hours fully. Usually a Lead Acid battery takes high current initially, which drops to 500 mA or less after 10-20 minutes. As a rule, it is advisable to charge the battery with a current that is 10 times lesser than the battery capacity. The Car battery is 32 Amps or 45 Amps so it requires 3.2 Ampere and 4.5 Ampere current respectively. So the charger should provide 14 volts with a current of 5 Amperes.

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VU meter

The VU Meter ( Volume Unit Meter) is the simple analogue moving coil meter used in audio equipments to measure the intensity of sound in Volume Units (VU).The level of measurement is in dB and time in seconds. The design of the VU meter is based on the way by which human ear perceives sound in volume.VU meters are well suited to indicate continuous audio signals than the fast transient audio signals.

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