Circuits & Schematics: power supply - 10

91. Switch mode hotwire thermostat
    Stephen Woodward
    Circuits Automation Analogue Design Measurement Supply STMicroelectronics TSB712
    .. it’s operated in linear or pulse mode, high efficiency is virtually guaranteed. This happens simply because when the power pass device and heater are combined, power dissipated isn’t wasted. Instead, by definition, it’s ...
    .. enough that, unlike Figure 2, Figure 1’s Q1 needs no heatsink and the overall circuit runs from only half the supply voltage. Heating efficiency depends on hotwire length, and ranges from 83% for 5 feet, to 94% for 15. These ...
    Sep 18, 2024

92. Mighty 555 and ESR-meter
    Peter Demchenko
    Circuits Measurement STMicroelectronics TS555
    .. current of the plain old 555 timer. From the block diagram in Figure 1 taken from the datasheet of the ST’s TS555 low power single CMOS timer) we can see that the Discharge pin (pin 7) repeats the Output pin (pin 3). In reality, they ...
    Sep 17, 2024

93. One-wire bus powers water-level sensor
    Dale Litwhiler
    Circuits Measurement Maxim DS2423
    .. one-wire bus ( Reference 1 ). The circuit uses approximately 150 µA of current, allowing the circuit to steal its power from the bus via the Schottky diode, D 1 . Because the circuit is sensing water that is part of the electrical ...
    Sep 2, 2024
94. Microcontroller supervises 0- to 20-mA protection circuit
    Anatoly Andrusevich
    Circuits Interfaces Microcontrollers Usage Texas Instruments SN74LVC1G02 SN74LVC1G32 SN74LVC1G74
    .. to convert the current signal into a voltage signal. Accidentally connecting the precision shunts to the current-loop power supply can cause damage, after which you must replace the shunt and recalibrate the system. To avoid that ...
    Aug 29, 2024
95. LED drivers minimize power dissipation
    Fons Janssen
    Circuits Supply Light Analog Devices MAX1951
    .. Unfortunately, most buck converters require a relatively high feedback voltage on the order of 1 V, which dissipates high power in the sense resistor Figure 2. An op amp, IC 2 , increases the LED-current error signal and reduces power ...
    Aug 27, 2024
96. Floating output, variable potential battery simulator
    Jim Williams
    Circuits Measurement Supply Analog Devices LT1010 LT1012 LT1021
    .. and drives a 680 µF capacitor to approximate a battery. Diodes preclude reverse biasing the output capacitor during supply sequencing and the 1µF -150k combination provides stable loop compensation. Figure 1. Battery simulator ...
    Aug 22, 2024
97. An accurate resettable fuse
    Peter Demchenko
    Circuits Supply ON Semiconductor TIP32G
    .. 20 mV the fuse goes “on”. Capacitor C1 provides compensation in the loop. Transistor Q5 should dissipate all power E I × I OUT and its V CE(SAT) should be as low as possible to reduce voltage losses, it also should have ...
    Aug 14, 2024
98. Simple discrete SE-to-differential precision in-amp circuit: High common-mode input range and 50% less power
    Chau Tran Jordyn Rombola
    Circuits Analogue Design Measurement Analog Devices AD629 AD7685 AD8421 ADA4807-2
    .. range to be suitable for these applications. There are many low cost in-amps with the bandwidth, dc accuracy, and low power consumption that can meet all of the system requirements. Another advantage of using an in-amp is that users do ...
    .. This circuit can also be used in power sensitive applications. With a total quiescent current of 5 mA and a dual 5 V power supply, it consumes about 50 mW, which is 50% less than other solutions with primary ADC drivers (for example, the ...
    Aug 8, 2024
99. Visual overload alert
    Nick Cornford
    Circuits Audio Texas Instruments LM393
    .. will slug the response time. DC levels above or below the relevant limits will turn the LED on continuously. Only +V and -V power rails are needed, a central ground being unnecessary, so it can freely be used with either single or split ...
    .. for the 2N5485 shown and largely independent of rail voltages from 9 V to 30 V. Make sure the device can withstand the peak supply voltage, though data sheet values are usually conservative. When built into equipment where the supply is ...
    Aug 6, 2024
100. Temperature compensated lead acid battery float charger
     Dave Conrad
     Circuits Supply Analog Devices LT1086
     .. note:Battery charging in a float or maintenance mode has been around for a while, especially for standby power, emergency lighting, telecom, uninterruptible power, and other critical power needs. The float method of ...
     Aug 5, 2024

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