Circuits & Schematics: power supply - 2

11. Efficient LED power supply has battery backup
    Circuits Supply Light LT3517 LT3518 LTC4412 PB137
    .. Yu, Juno Lighting Group, Des Plaines Power three to six LEDs from an ac- or dc-power source and charge a backup battery. LEDs find wide use in emergency ...
    .. or two capacitors filter into dc. The battery (not shown) is a 12 V lead-acid type. IC1 compares the battery voltage to the supply voltage. When the rectified voltage drops below the battery voltage, the battery takes over to provide LED ...
    Aug 3, 2010

12. Multimeter on ATmega8 for power supply unit
    Circuits Microcontrollers Usage Measurement
    .. function of the multimeter is that it can control (switch on and off) an electric fan used to cool the main heatsink. The power threshold at which the fan switches on can be adjusted using One Touch Button Setup. Technical Specifications - ...
    .. where the current sense shunt resistor is connected in series with load at the negative voltage rail. It needs only one supply voltage that can be acquired from main PSU. An additional function of the multimeter is that it can control ...
    Aug 13, 2010

13. Power-supply circuit operates from USB port
    Circuits Interfaces Beginners Supply Power
    .. has a USB (Universal Serial Bus) port that can supply 5V 5% at 500 mA for peripherals. Powered USB hubs also provide this power. You can use a USB port to power an external circuit, which is useful when you have no other dc source ...
    Oct 14, 2010
14. 0-1000 Volt Regulated High Voltage Power Supply
    Circuits High Voltage Supply Power
    Input voltage from high voltage DC DC converter is 12V AC at 800mA current and then converted to DC through a bridge rectifier Diode 1A. The voltage output of converter circuit can be adjusted in the range of 0-1000V DC. This high voltage DC DC ...
    Dec 15, 2010
15. 30V power supply with +5V
    Circuits Supply Power
    .. Inoue I made the power supply which makes about +30V with +5V power supply. The direct current is changed into the alternating current ...
    Jan 6, 2011
16. Switch Mode Power Supply +5V
    Circuits Supply Power National Semiconductor LM2671 LM2674
    .. Switch Mode Power Supply circuit use the IC from National Semiconductor has been producing and designing ICs for use in ...
    Jan 6, 2011
17. Power Supply Monitor for TTL
    Circuits Beginners Supply Power Linear Technology LTC1042
    .. simple TTL power supply monitor circuit monitors the 5-volt level TTL power line and gives a signal whether the supply voltage ...
    Feb 24, 2011
18. Circuit Combines Power Supply and Audio Amplifier
    Susanne Nell
    Circuits Audio Supply LM317
    .. circuit in Figure 1 can help if you must transfer dc power and audio over a pair of copper wires. One application for such a circuit is a low-cost door-opening system ...
    .. is a low-cost door-opening system with speech input. The circuit uses only one IC, the well-known LM317 , a low-cost power-supply regulator. Using this chip, you can modulate the adjustment-pin input with the audio signal from an electret ...
    Apr 4, 2016
19. Minimize Noise in Power-Supply Measurements
    John S Lo Giudice
    Circuits Measurement
    .. excess noise from an oscilloscope probe yields better measurements You must minimize noise when measuring ripple in power rails because the ripple’s amplitude can be low. Oscilloscope probes are essential measurement tools, but ...
    .. socket or a vertical socket, similar to those in Figure 1. Solder the center leg of the socket to the output of the power supply and solder the other leg to the power-supply return. Connect a 0.1-uF surface-mount, stacked ceramic ...
    Mar 12, 2012
20. Double the protection of a laser driver using a 1V power supply
    Circuits Light Power
    .. current and light emission. Figure 1. You can use this dc-dc step-up circuit and dual current-control transistors to safely power this laser from an almost-discharged battery. In Figure 1, the transistors Q 1 , Q 2 , and Q 3 compose a ...
    Dec 29, 2013

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