Circuits & Schematics: power supply - 7

61. Understanding amplifier power ratings. RMS power. DIN power. PMPO (Peak Music Power). Speaker power ratings. Methods for making 4 ohm speaker to appear as 8 ohm. Dampling factor. What is amplifier "bridging" or "monoblocking"?
    Circuits Audio Measurement
    .. are different methods for measuring the power ratings for amplifiers and speakers. And different measuring methids give different values so it is vital to ...
    .. of nominal value both at input and output. The continous power is measured when the amp is supplied by its normal power supply. It must then be able to deliver the rated power at 1 kHz for at least 10 minutes while the maximum THD does ...
    Sep 4, 2005

62. Minimize Input-Supply Ripple Current In LED Driver Applications
    Circuits Supply Light Intersil EL7801
    .. voltage was multiplied by two and the LED voltage was post-regulated by an internal low-dropout regulator. But some high-power LEDs require much higher current before they start emitting light. Therefore, most of today's ...
    .. the duty cycle. This simple approach works very well for dimming the LEDs, but it injects high ripple current on the input supply. In some systems, this becomes unacceptable because it drags down the input supply voltage. The peak-to-peak ...
    Jul 4, 2020
63. Enablement of Batteryless Applications with Wireless Power
    Circuits Supply Analog Devices LTC3588-1 LTC4123 LTC4124 LTC4126 LTC6992-1
    .. Vitunic, Analog Devices Analog Dialogue Question: My application doesn’t have a battery. Is it possible to power it wirelessly? Answer: Yes, sure a simple integrated nanopower solution originally designed for energy ...
    .. in the vicinity of it, then it can be wirelessly powered on demand. Enter the LTC3588-1 nanopower energy harvesting power supply. Although originally designed for energy harvesting (EH) applications powered from a transducer (for example, ...
    Jul 11, 2020
64. Short DC Power-Line Pulses Afford Remote Control
    Tom Hornak
    Circuits Supply Light Texas Instruments CD74HC14
    .. controlled light source to an existing ceiling lamp controlled by a wall switch, you may find that stringing a second power line is impossible. First, you can replace the wall switch by the circuit in Figure 1. Pushing the on switch S ...
    .. resistor R 1 creates a 60-Hz square wave across the 6 V zener diode, D 3 . Diode D 1 and filter capacitor C 2 generate a dc supply voltage of V DD = 5 V for the control circuit's active elements. Two two-stage RC filters connected to W ...
    Nov 3, 2022
65. Gnat-power sawtooth oscillator works on low supply voltages
    Circuits Oscillators TS12011 TS12012
    .. circuit, drawing less than 3.2 uA and working at under 1 V, is a useful building block that fits the bill for extremely low-power consumption and operation to low supply voltages. It could be used as the basis for a PWM control loop, a ...
    Dec 19, 2013
66. Power resistor varies in value
    Bogdan Raducanu
    Circuits Measurement Supply
    .. power supplies or discharging batteries usually requires a constant-current load. Sometimes, however, you must study ...
    .. with low-cost components. Depending on the op amp’s input range, the circuit requires an external dual power supply. Figure 2 shows a prototype of the tested and built circuit using a potentiometer for changing the equivalent ...
    Jul 16, 2020
67. Flash an LED from ac-mains power
    T A Babu
    Circuits Supply Light Fairchild LM317
    .. Babu EDN LED technology is opening the door to a variety of high-power-illumination applications. The circuit in Figure 1 can let you know when ac power is available. To drive a ...
    .. the total design. You can also simplify the circuit to run on dc power, which lets you use it from automotive batteries to supply light at night. Figure 1. This circuit uses a simple DIAC relaxation oscillator, which activates a ...
    Jul 26, 2020
68. Single-Supply Circuit Measures -48 V High-Side Current
    Circuits Supply AD629 AD8603
    .. operational amplifier, both from Analog Devices, to measure current at 48 to 60 V and operates from a single positive-power supply. Figure 1 shows how the AD629 and AD8603 measure current in the presence of a 48 V common-mode voltage. ...
    .. 60V. Measuring its current draw typically requires components that operate on 15V dual supplies. Eliminating the negative supply would reduce system complexity and cost. This Design Idea uses an AD629 difference amplifier and an AD8603 ...
    Apr 9, 2008
69. IC Performs Delayed System Reset Upon Power-Up
    Circuits Microcontrollers Usage Theory Maxim MAX6805
    .. for a certain period of time before you can apply the reset, or active low. The circuit in Figure 1 proves useful during power-up when there is no need to press the reset button once the device powers up, because reset occurs ...
    .. the transistor discharges C 2 . Once this action happens, Q 1 turns off. R 1 charges up the negative side of C 1 to the supply voltage, V DD . Because the positive side of capacitor C 1 cannot change instantly, it appears to be charged ...
    Apr 11, 2008
70. Mains sockets switched automatically by a Control Socket Up to 1000W switched power
    Circuits Domestic Supply
    .. appliances will be automatically switched off. A further application is the control of a High Fidelity chain, plugging the Power Amplifier in the Control Socket and - for example - CD Player, Tape Recorder, and Tuner in the Switched ...
    .. if the control appliance is on or off. This could also happen when devices connected to the mains by means of plug-in power supply adapters are used as control appliances, due to their lack of a mains switch. In spite of this restriction, ...
    Jul 20, 2009

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