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ugn 3503

ugn 3503

When we do not drive our cars for extended periods of time, the abandoned rechargeable batteries become fully discharged. Sometimes, these get damaged, too. Batteries have self-discharging rates that depend on their type and capacity, and may vary from a few milliamperes to tens of milliamperes. Also, the electrical installations in a car have leakage

When we do not drive our cars for extended periods of time, the abandoned rechargeable batteries become fully discharged. Sometimes, these get damaged, too. Batteries have self-discharging rates that depend on their type and capacity, and may vary from a few milliamperes to tens of milliamperes. Also, the electrical installations in a car have leakage

Here is the simple automatic changeover circuit wherein a DC load like a series of LEDs are driven either by a battery or an AC-DC power supply.

Automatic Changeover Switch Circuit using 555 Timer

Here is the simple automatic changeover circuit wherein a DC load like a series of LEDs are driven either by a battery or an AC-DC power supply.

Multipurpose White-LED Light

Multipurpose White-LED Light

Temperature Controlled DC Fan using ATmega8 Microcontroller Circuit Diagram

Temperature Controlled DC Fan using ATmega8 Microcontroller

Temperature Controlled DC Fan using ATmega8 Microcontroller Circuit Diagram

Humidity Indicator and Controller

Humidity Indicator and Controller

This proximity detector using an infrared detector (Fig. 1) can be used in various equipment like automatic door openers and burglar alarms. The circuit primarily consists of an infrared transmitter and an infrared receiver. The transmitter section consists of a 555 timer IC functioning in astable mode. It is wired as shown in the figure. …

This proximity detector using an infrared detector (Fig. 1) can be used in various equipment like automatic door openers and burglar alarms. The circuit primarily consists of an infrared transmitter and an infrared receiver. The transmitter section consists of a 555 timer IC functioning in astable mode. It is wired as shown in the figure. …

PC-Based Candle Ignitor

PC-Based Candle Ignitor

Strobe lights are widely used by disco lovers to create wonderful visual effects in disco halls and auditoria. The circuit of a battery operated portable miniature strobe light, which can be constructed using readily available inexpensive components, is described here. For convenience and simplicity, an ordinary neon lamp is used here in place of the …

Strobe lights are widely used by disco lovers to create wonderful visual effects in disco halls and auditoria. The circuit of a battery operated portable miniature strobe light, which can be constructed using readily available inexpensive components, is described here. For convenience and simplicity, an ordinary neon lamp is used here in place of the …

This digital thermometer can measure temperatures up to 150C with an accuracy of +_1C. The temperature is read on a 1V full scale-deflection (FSD) moving-coil voltmeter or digital voltmeter. Operational amplifier IC 741 (IC3) provides a constant flow of current through the base-emitter junction of npn transistor BC108 (T1). The voltage across the base-emitter junction …

This digital thermometer can measure temperatures up to 150C with an accuracy of +_1C. The temperature is read on a 1V full scale-deflection (FSD) moving-coil voltmeter or digital voltmeter. Operational amplifier IC 741 (IC3) provides a constant flow of current through the base-emitter junction of npn transistor BC108 (T1). The voltage across the base-emitter junction …

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