Voltage Detector Circuits

This circuit has a 100-m V hysteresis which can be used in applications where very fast transition times are required at the output, even though the signal input is very slow. ..

Window-comparator

This window comparator generates an output pulse for each event that occurs within a specified window. That is, each output pulse signifies an input voltage pulse or level change that exceeds VREFLOW. but not VREFHIGHÂ· The monostable multivibrators, IC2A and IC2B, produce a 10-l"s pulse at their Q output in response to a rising edge at their A input. Comparator IC1B produces a rising edge when the input exceeds VREF Low and comparator IC2A produces a rising edge.....

Dual-limit-microvolt-comparator

When the upper or lower limit is exceeded, the LED lights up. Positive feedback to one of the nulling terminals creates 5 to 20 p,V of hysteresis on both amplifiers. This feedback changes to offset voltage of the LT1002 by less than 5 p,V. ..

Four-channel-comparator

When operated as an open loop without compensation, the HA-2400 becomes a comparator with four selectable input channels. The clamping network at the compensation pin limits the output voltage to allow DTLor TTL digital circuits to be driven with a fanout of up to ten loads. The circuit can be used to compare several signals against each other or against fixed references; or a single signal can be compared against several references. ..

Voltage detector relay

While the battery is being charged, its voltage is measured at V. If the measured voltage is lower than the minimum the relay will be energized, that wiU connect the charger circuit. When the battery voltage runs over the maximum set point, the relay is deenergized and it will be held that way until the voltage decreases below the minimum when it will be connected again. ..

Electrostatic-detector

The heart of the electroscope is the two junction FETs Ql and Q2 connected in a balanced-bridge circuit. The gate input of Ql is connected to the wire pick-up antenna, while Q2"s gate is tied to the circuit"s common ground through R2. That type of bridge circuit offers excellent temperature stability; therefore, Ql is allowed to operate in an open-gate configuration. ..

Wide-range-peak-detector

ICl and IC2 form an inverting half-wave precision-rectifier/peak-detector circuit. Negative input-signal, swings with peaks larger than the voltage on Cl, cause this capacitor to charge to the new peak voltage. The capacitor holds this voltage until a larger signal peak arrives. When the input swings high, comparator IC4 detects the zero crossing and triggers the one-shot multivibrator. The one shot closes FET switch S2, thereby causing C2 to charge to the peak voltage.....

Null detector

Null detector uses simple LED readout to indicate if test resistor R* is below, equal to, or greater than test resistance Rref. IfR* = Rref, the 741 output sits at midpoint value of 4 volts and LED A lights..

Comparator-latch

The primary advantage of this circuit, when compared to other comparators, is its ability to latch after the input has reached a predetermined threshold level. When the input exceeds the threshold level, the LM311N output increases. This transition enables the strobe input, preventing the output from falling low. A high-level voltage on the reset input will tum off Q1, thereby removing the supply voltage from the open collector output of the LM311N. ..

Isolated Voltage Sensor

A simple voltage-controlled oscillator (VCO), coupled to your instrumentation by an optoisolator, allows you to mea..

Backup Supply Activates By Drop-In Main Supply

A supply monitor using two TL7702A chips monitors the Â± 15-V supplies and activates the back..

Voltage-Programmable Current Source

This, circuit is a programmable current source in which op amp LT1102 (Linear Technology Corp.) is used..

Low voltage detector

The values of Rl, R2, and D1 are selected for the voltage applied. Using a 12-volt battery, Rl = 10 K, R2 = 5 K and D1 is a 5-volt zener diode, or a string of forward-biased silicon rectifiers equaling about 5 volts. Transistor Ql is a general-purpose UJT (Unijunction Transistor), and Q2 is any small-signal or switching NPN transistor. When detector is connected across the battery terminals, it draws little current and does not interfere with other de vices powered by the.....

Audio-level-detector

This circuit draws very little power, less than 5 mA with a single 6-V power supply. making it ideal for portable battery-operated equipment. The small size and low power consumption belie the 90-dB dynamic range and 10.5-I"V sensitivity. De output voltage proportional to the log10 of the input signal level. Thus, a standard 0 -5 voltmeter can be linearly calibrated in decibels over a single 80-dB range. ..

Power Buffer Boosts Reference Current

A method of boosting the output current of a reference and also protecting against overloads is shown..

Analog-peak-detector-with-digital-hold

Analog peak detection is accomplished hy repeatedly measuring the input signal with an a/d converter and comparing the current reading with the previous reading. If the current reading is larger than the previous, the current reading is stored in the latch and becomes the new peak value. ..

Static Detector

This circuit detects the presence of electrostatic fields by using an FET to alter the flash rate of two LEDs. The FET is i..

Ac-line-voltage-announcer

The range of this ac-voltage monitor is 100 to 140 Vac, with a resolution of 1 V. The speech processor interprets an 8-bit binary input code from an analog-to-digital converter. The processor"s pulse-code-mod ulated output then passes through a filter and an amplifier before driving tbe circuit"s speaker to vocalize the corresponding number. Each time switch S1 is _pressed, the speech-processor program enun ciates tbe monitored voltage readings from 100 to 140 V,.....

Frequency-detecting-comparator

A quad comparator forms the basis of a frequency detector that is faster and less expensive than more complex versions designed around frequency-to-voltage converter chips. Positive feedback through a 5MO resistor allows the circuit to resolve changes as small as two percent; the output responds to those changes in about one cycle. When the input frequency is high, V, is pulled low; it"s never allowed to exceed 213 V. When the input frequency is lower than the limit,.....

5-Range Linear-Scale Ohmmeter

Rx is inserted in the feedback path of IC1. A known reference current is selected from reference voltage gene..

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Comparator Circuit | TSAE Project

Comparator Circuit. With Eric's work on the differentiator circuit nearing completion (or as close to completion as we'll be able to get), and Rob's work on the actual program almost finished, it w...

error in lm358 comparator circuit - All About Circuits Forum

Hello everyone,I am designing an signal conditioning unit. Everything is working except the comparator circuit.I have used an lm358 ic to compare the voltage. The supply voltage is 24 and 0.The inv...

Voltage Comparator circuit op amp VS Comparator - All About ...

Hi All, I have built a simple working comparator circuit as shown below comparator.bmp. IC1 is an LM358AN Op amp, the two 10K pots allow me to change the voltage at the two input pins with the two ...

Sharingje: Voltage Comparator Information And Circuits

This page provides basic information about voltage comparator integrated circuits and is to act as reference material for other circuits. The circuits shown are based on the LM339 Quad Voltage Comp...

(Comparative) Successes and Failures | TSAE Project

With the comparator design turning over in my head for days now, I was finally able to make it into lab today and play around with a physical circuit. The single comparator circuit I used last week...

Problem with microphone powering up a comparator circuit - Rqgg

The circuit below is supposed to turn on a LED when the microphone input reaches these levels: 1V, 3V, 5V, 7V..

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