Circuits & Schematics: power supply - 8

71. Supply Voltage Indicator
    Circuits Supply
    .. Adzic - Serbia Montenegro Description A novel supply voltage monitor which uses a LED to show the status of a power supply. Notes This simple and slightly odd circuit can clearly show the level of the supply voltage (in a ...
    Dec 15, 2009

72. Power Fail Alert
    Circuits Supply LM317
    .. R1, trickle current being several milliamps. Q2, Q3, R5 and BZ1 ( a piezo sounder) form a solid state alarm. As long as the power is on, D3 and R4 positively bias Q2 into saturation. Q2 collector will be close to zero, and hence Q3 and the ...
    .. Collinson Description In this circuit an electricity supply (domestic or industrial) is continually monitored. Should the supply be interrupted then an alarm will sound ...
    Sep 27, 2010
73. 1.3 Volt Power Source
    Circuits Supply
    .. Collinson Description This is a replacement power source for 1.3V mercury cells or other small batteries. It has many uses and I use this circuit in my computer ...
    .. Notes This circuit takes it power from a PC. The power connectors have colour coded wiring, red and black are the 5V supply, black and yellow are the 12V supply. These are extremely high current so absolute care must be taken to ...
    Oct 4, 2010
74. Single-/Dual-Supply Precision Analog Limiter Handles Wideband Signals
    Alex Rysin
    Circuits Analogue Design Linear Technology LT1810
    .. in Figure 1 precisely limits the wideband input signal Vi at the V REF level and can be used with both single and dual power supplies. Figure 1. This analog circuit, based on the LT1810 op amp, precisely limits input signal V I at ...
    Aug 17, 2017
75. Very Low-Power Inrush-Current Limiter Protects Hot-Pluggable Apps
    Circuits Power
    .. Pezeshkian Inrush current occurs in many circuits that are hot-plugged into a power supply or battery, causing the input load capacitor to experience a sudden surge of current. This surge can ...
    Nov 10, 2010
76. High Power LED mood Lamp
    Circuits Microcontrollers Usage Light
    .. fading lamp, that looks amazing! The purpose of this page is to try to give some hints building it successful. This high power led mood light is based on PIC16F628 and the ability of this mcu to produce PWM pulses. Varying pulse width we ...
    .. pause on a desired color. Finally we will make some power dissipation measurements to help us select an appropriate power supply unit. Housing for best color diffuse You can use your imagination to find a housing that will be able to ...
    Nov 8, 2010
77. 5 volt charger adapter using LNK616PG controller
    Circuits Supply Power Power Integrations LNK616PG
    .. very simple 5 W constant voltage ,constant current (CV/CC) universal-input power supply for cell phone or similar charger applications can be designed using the LNK616PG product from the ...
    Jan 14, 2011
78. Low-Power, Battery Powered Square Wave Oscillator with Hibernation Mode
    Chau Tran
    Circuits Analogue Design Oscillators Analog Devices ADA4807-2
    .. components. Figure 1. The square wave oscillator. The circuit of Figure 1 employs an ADA4807-2 , which is a dual, low power, low noise, rail to rail voltage feedback amplifier. The first op-amp, A, is the main square waveform ...
    .. oscillate automatically. When the capacitor reaches each threshold, the charging source is switched from the negative power supply to the positive power supply and vice versa. The system is in unstable equilibrium if both the inputs and ...
    Apr 4, 2016
79. Delay Circuitry Controls Supply-Voltage Startup Sequence
    John Betten
    Circuits Supply Vishay SI2308DS Si2337DS
    .. several negative and/or positive voltages. The larger voltages are generally used to ring the phone, and the lower voltages power the phone while it's off-hook. As an example, consider a design that requires output voltages of 51 V, +60 ...
    .. some ICs, supply voltages should be applied in a particular sequence. One example is the subscriber line interface circuit ...
    Dec 13, 2021
80. Isolated-FET Pulse Driver Reduces Size, Power Consumption
    Jaime Castelló José María Espí Rafael García-Gil
    Circuits Power APT APT40GF120JRD
    .. controlled rectifiers and inverters, matrix cycloconverters, and cascaded power stages typically comprise large numbers of power transistors, each with its own driver circuit. The circuit in ...
    .. A single transformer provides galvanic isolation, and the circuit consumes little power from its 15 V primary-side power supply. Tested satisfactorily using several MOSFETs and IGBTs with input capacitances as high as 5 nF, the driver ...
    Mar 30, 2022

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