Circuits & Schematics: -Wire Barometer 5/10 Volt Design vrs - 8

71. Microcontroller Solves Complex Temperature Polynomial Equations
    Ricardo Jimenez Roberto Solorio
    Circuits Microcontrollers Usage Theory LM103 PIC16F887
    .. a sampling time of 50 µs. The thermistor’s voltage reading is stored in binary format in the variable “ volt ” with the instruction ADCIN 0, volt . Then, this reading is multiplied by 48,828 to convert it to decimal, ...
    .. is the polynomial “Steinhart-Hart” equation (S-H), which has an error of 0.1 C. The temperature range for this design is from 0 C to 100 C. Three thermistor coefficients A, B, and C are required to implement the S-H equation. ...
    May 20, 2015

72. Schmitt trigger uses two transistors
    Circuits Analogue Design
    .. term depends on the gain of Q 2 , the measured voltage is usually somewhat different, but is typically in the 2 to 3 volt range. The current in RIN also adds into the voltage on R 2 (Eq. 9), and if R 1 is too small, the current will ...
    .. Abell EDN This Design Idea shows how to add positive feedback to a Darlington pair to create a Schmitt trigger with very high ...
    Sep 24, 2015
73. High Power RGB LED Color Mixing
    Circuits Light Power CAT4101
    .. utilizing 1 amp maximum constant current drivers that are adjustable with trimmer potentiometers and powered from a 5 volt DC supply. Figure 1. Constant current drive circuit. With a 500 millivolt minimum above VF of the LED die, this ...
    .. aspect of high powered RGB LEDs on which we will focus. In order to produce consistent and repeatable colors, the first design criteria that must be met is that of a constant drive current for each of the RGB die. As shown in Figure 1, ...
    Mar 18, 2015
74. Linear ramp generator uses one op-amp
    Circuits Analogue Design Oscillators
    .. follower, with D1 D2 clamping the input to one diode drop above or below the output. When the input step-changes by a volt or more, the diodes will keep the voltage across R2 at a nearly constant 0.3 V (because the output will follow ...
    .. Abell EDN This Design Idea demonstrates a simple way to turn a step input into a ramp of nearly constant slew rate. The basic ...
    Nov 11, 2015
75. Simple circuit turns scope, function generator into JFET curve tracer
    Circuits Measurement Texas Instruments LM358
    .. to (I DS )×(R1). Op-amp U1B inverts this voltage and buffers it out for plotting, scaled at either 1 mA or 10 mA per volt. Figure 1. The curve tracer circuit is a simple transimpedance amplifier that converts the device test's I DS ...
    .. Reeve Electronic Design Commercial curve tracers have existed for decades. But designers without access to one can create a simple ...
    Jun 20, 2018
76. Two Terminal Bipolar Power Supply
    Victor Khasiev
    Circuits Supply Analog Devices LT8714
    .. positive output are shown in Figure 2. Figure 2. The topology of a 2-quadrant operation with a positive output. When the volt-second balance is in a steady state, the duty cycle can be derived from the expression: To verify the design, ...
    Oct 14, 2019
77. Ultralow Noise, 48 V, Phantom Microphone Power Supply Using a Tiny DC-to-DC Boost Converter
    Christopher Jarboe Thomas Mosteller
    Circuits Audio Supply Analog Devices LT8362
    .. of 63 V means that the required caps are both big and expensive. A second approach would be to increase the LT8362 output a volt or two and add an LDO regulator to the output. This requires a high voltage LDO regulator, which usually costs ...
    .. doubling up on bulk output cap C4 to maintain equivalent performance. References Nelson, Carl. Application Note 19: LT1070 Design Manual. Analog Devices, Inc., June 1986. Williams, Jim. Application Note 101: Minimizing Switching Regulator ...
    Jun 2, 2020
78. Precision active load operates as low as 2V
    Circuits Analogue Design Measurement Supply Texas Instruments LM10
    .. clockwise. On Range C, an external voltage source that connects to R 13 controls the load current at a rate of 1 A per volt with P 1 set fully clockwise. You can drive the external input with a function generator to test a power ...
    .. This Design Idea presents a self-powered, precision-active-load circuit that improves on a previously published design ...
    Sep 10, 2020
79. Scalable current load offers constant resistance mode
    Circuits Measurement Supply
    .. effective the voltage drop across the source resistor must be comparable to the threshold, making it a large fraction of a volt. The consequence is that the equalizing resistors dissipate large power, and the voltage drop across them eats ...
    .. voltage inversion at the output of the adder. Figure 3. This diagram illustrates the voltage summation at V OUT . In this Design Idea, a simpler way of adding the voltage drops is shown, using the resistors R 7 and R 8 and just one op ...
    Dec 17, 2020
80. Single IC Can Produce Isolated or Nonisolated ±12 V Outputs from 30 V to 400 V Input
    Circuits Supply Analog Devices LT8315
    .. C FLY , a second inductor L2, a catch diode D4, and the negative output capacitor C O2 . According to the inductor volt-second balance for the circuit loop of C O1 -L1-C FLY -L2, the average voltage across L1 and L2 is zero, so the ...
    .. output voltage is sensed when the secondary current is almost zero to achieve excellent load regulation. In a dual output design, this unique sensing scheme allows each output to be closely regulated both outputs can dominate the ...
    Jan 13, 2021

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