single cell power supply circuit

A DC shunt regulator power supply circuit is presented, which operates in parallel with a radio circuit. The circuit begins with an AC voltage of 22V, which is stepped down to 8V using a transformer. The 8V AC voltage is...

Mobile Phone Battery Charger

A small and portable unit that can be assembled on a veroboard. Mobile phone chargers available in the market are quite expensive. The circuit presented here comes... The described circuit is a compact and cost-effective mobile phone charger designed for assembly...

Low Power consumption 5V regulator circuit

The circuit described below is notable for its low power consumption. With a 9V input and no load at the output, it draws only 50 mA, which is significantly lower than the quiescent current of a 78L05 regulator. The circuit...

DC arc welding machine no-load power path from 2

The DC arc welding machine is connected to the secondary load path of the power circuit as illustrated in the figure. This circuit is designed for use during extended downtime, approximately lasting a few minutes, and is not suitable for...

Automatic Switching for Battery USB Power Connection

This is a simple circuit for automatic switchover between battery and USB port. This circuit uses a more general step-up converter architecture. The circuit designed for automatic switchover between a battery and a USB power source employs a step-up converter...

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...

micro power pulse generator

This circuit generates clean logic pulses with minimal current consumption. It is designed to produce short 2 ms pulses at a frequency of one pulse per second, drawing only 1 microamp from a 9-volt battery. The described circuit operates efficiently by...

Control a processor`s power supply in real time

In battery-powered applications in which power management is key, a microprocessor may adjust its core voltage corresponding to an increase or a decrease in clock speed, allowing full processing power when necessary but not wasting excess power when idle. The...

Battery-capacity-tester

The test circuit indicates the remaining capacity of a battery by measuring the duration, in seconds, that an LED remains illuminated after the test switch (S1) is activated. This circuit has demonstrated reliability in testing nickel-cadmium (NiCad), carbon, and alkaline...