9 v battery replacement circuit

The target of this project was the design of a small portable mixer supplied by a 9V PP3 battery, keeping high quality performance. The mixer is formed assembling three main modules that can be varied in number and/or disposition to...

charging circuit

Building battery boxes for the Speedster. Although this topic may not seem thrilling, builders converting vehicles to electric drive often discover that the process of making a car run on battery power is relatively straightforward. However, about 50% of the...

Deactivating-battery-sensor

The sensing circuit quickly disconnects the battery voltage and load when the voltage falls below a predetermined threshold. The one-way operation ensures that the circuit does not reconnect the load if the voltage subsequently rises above the threshold. Component Cl...

Car battery condition checker

This circuit utilizes an LED and a 4081 CMOS integrated circuit. A variable resistor is employed to adjust the voltage threshold at which the LED activates. The control should be set so that the LED illuminates when the voltage from...

Car Battery Failure Detector

A car battery deteriorates in use, and its life seldom exceeds four years. When new, its voltage may drop to only 2V while cranking the engine. A car battery, typically a lead-acid type, is essential for providing the necessary electrical energy...

Battery Volt Meter

This circuit is used to measure the voltage on a 12V (nominal) lead acid rechargeable battery system. It was specifically designed for use in solar powered systems, but is general enough that it can be used for automotive or other...

Battery Charging On Board Ship

Batteries serve as one of the energy sources available on vessels, utilized during blackouts and emergency situations aboard a ship. These batteries are employed for low-voltage DC systems, such as bridge navigational instruments, and must be kept charged to provide...

Battery-Voltage Measuring Regulator

This circuit enables a microprocessor system to measure its own battery voltage. A Texas Instruments TI43 precision shunt regulator functions as a precise reference and integrator/amplifier, measuring its own supply through voltage-dependent charge and discharge time intervals. It is important...

Battery-Saving Disconnect Switch

At a predetermined level of declining terminal voltage, the circuit disconnects the battery from the load and halts potentially destructive battery discharge. Q1, a high-side, floating-source MOSFET, acts as the switch. The overall circuit draws about 500 µA when the...