5V Powered Thermistor Heating/Cooling Automatic Thermostat
The LTC1040 is a monolithic CMOS
dual comparator manufactured using Linear Technology’s enhanced LTCMOS
TM silicon gate process. Extremely low operating power levels are achieved by internally switching the comparator ON for short periods of time. The CMOS
output logic holds the output information continuously while not consuming __ Linear Technology/Analog Devices App Note, Mar 30th 2010
A Seven-Nanosecond Comparator for Single Supply Operation
Linear Technology AN72 __ Designed by Jim WilliamsMay 1st, 1998
Absolute Value (Full-Wave Rectifier)
For negative inputs, the first section operates as a closed-loop inverter (A=-1) and the second stage is simply a buffer for the positive output. When the input signal is positive, the first opamp output remains saturated near ground and the diode becomes high-impedance, allowing the signal to pass directly to the buffer stage non inverted. The composite effect is a full-wave rectified waveform at the output of the buffer. __ Linear Technology/Analog Devices App Note, Jun 21, 2011
Absolute-value comparator touts accuracy, size
03/07/02 EDN-Design Ideas A typical window comparator uses two comparators and a single op amp to determine whether a voltage is inside or outside a boundary region. Figure 1 shows a typical implementation. IC1 is an inverting op amp with a gain of –1. VREF and –VREF create the wi__ Circuit Design by Teno Cipri, Engineering Expressions Consulting, Sunnyvale, CAEDN Design Idea March 7, 2002
Absolute-Value Delivers High Bandwidth
15-May-03 EDN-Design Ideas Most absolute-value circuits have limited bandwidth and high component count, and they require several matched resistors. The circuit in Figure 1 uses three fewer components than most absolute-value circuits require, and only two of the resistors must have 1% tolerance to obtain 1% accuracy. This circuit's output voltage is an accurate representation of the absolute value of the input signal,__ Circuit Design by Ron Mancini, Texas Instruments, Bushnell, FL
AC Peak Detector that is Precise
This unique circuit uses a very inexpensive voltage comparator to form a peak detector. The DC voltage produced tracks the positive peak of the input signal. It works from about ten millivolts to about 10 volts peak to peak. The maximum frequency is about . . . Hobby Circuit designed by David Johnson P.E.-February, 2002
Acceptable Voltage Indictor
I have used this circuit many times in custom test fixtures where a simple go-no go indication was needed. The circuit can also be used to adjust a particular voltage be within specific high or low limits. The three LEDs will indicate if the voltage is. . . Circuit by David Johnson P.E.-February, 2002
Add Hysteresis to a Voltage Comparator
4-Mar-10 EDN-Design Ideas Positive feedback is a typical technique for distributing hysteresis around a comparator, provided that you have a resistive path between the comparator's output and the noninverting input. Positive feedback forms two threshold voltages that have (or assume] fixed values. In addition, they depend on the saturation values of the comparator's output stage__ Circuit Design by Luca Bruno, ITIS Hensemberger Monza, Lissone, Italy
Amplifier for a Xenon Lamp Flash Detector
This circuit has a very low standby current requirement yet has very high sensitivity toward the light flashes from a xenon lamp. When connected to a flip/flop it can serve as an on on/off Controller. . . Circuit by David Johnson P.E.-February, 2002
AN13High Speed Comparator Techniques
Linear Technology AN13 __ Designed by Jim WilliamsApr 1st, 1985
AN72A Seven-Nanosecond Comparator for Single Supply Operation
Linear Technology AN72 __ Designed by Jim WilliamsMay 1st, 1998
Analog comparator recognizes three signal relations
07/23/13 EDN-Design Ideas Several years ago we were developing a clamp-on photometer, a hand-held instrument that could be clamped onto a communications optical fiber to indicate the presence of light, its direction of travel, and the presence of combinations of low-frequency test tone modulation. Its purpose was to positively identify a particular__ Circuit Design by Glen Chenier
Analog Comparison, Digital Result
Comparators are very useful for comparing two analog voltages and providing a digital result. In this case, if the light source is dim, a red LED is enabled. If the light source is bright, a green LED is enabled. However, once comparators are understood, they can be useful for driving small robots or helping a microcontroller. __ Contact: David Cook
Battery Charge Current Indicator
This circuit turns on a LED whenever it detects at least 25ma of battery charge current. . . Circuit by David Johnson P.E.-July, 2006 |