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 12V systems. Lead acid batteries normally spend their working lifetime in the voltage range of 11-15 Volts. This meter circuit was designed to show the voltage range of 10-15V on an analog meter movement, it can be used to show the battery charge state from empty to full. source
Power supply circuits
Subcategories
Switching-regulator output goes below Vref
The feedback arrangement of typical switching regulators doesn’t allow the regulated outputs to go lower than the reference voltage. If you try to lower the output by modifying the feedback network, the compensation components the manufacturer recommends may no longer stabilize the regulator’s error amplifier. An external reference voltage helps overcome this problem. source
Synchronized regulator produces coherent noise
By using a gated-oscillator architecture instead of a clocked-PWM one, gated-oscillator-type switching regulators permit high efficiency over extended ranges of output current. This architecture eliminates the housekeeping currents associated with the continuous operation of fixed-frequency designs. Gated-oscillator regulators simply self-clock at whatever frequency is necessary to maintain the output voltage. Typically, loop-oscillation frequency ranges from a few hertz to the kilohertz region, depending on the load.source
Programmable diode biases bridge
A programmable reference diode, such as the Motorola TL431A, can supply constant-current bias for a silicon pressure-sensor bridge. This circuit is simpler than using an op amp and separate reference diode or than using a current diode, which requires temperature compensation.source
Multiple Output Flyback Power Supply for Audio Amplifier
The universal input power supply shown in Figure above has multiple outputs, ±26 VDC, ±15 VDC, and +5 VDC. The ±26 V outputs can each deliver a minimum output current of 2.42 A peak (thermally limited) and 1.45 A continuous. Additionally, the voltage regulation and, importantly, transient response is excellent over the entire load range (no-load to full load).source