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Amplifier Circuits:  Operational
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Amplifier -- Main Page
 

Last Updated: November 30, 2017 07:38 AM

 
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Lead-Acid Battery Charger with Voltage Analyser -  Nowadays maintenance-free lead-acid batteries are common in vehicles, inverters, and UPS systems.  If the battery is left in a poor state of charge, its useful life is shortened.  It also reduces __ Electronics Projects for You

LF071 Mic Amplifier -  A high quality microphone preamplifier using a single power supply, suitable for dynamic or electret microphones.  The op-amp used can be any low noise, high performance type, e.  g.  NE5534, TL071, OPA 371 etc __ Designed by Andy Collison

Light Monitor Circuit -  The circuit below takes advantage of a low power op amp with a “rail to rail” feature.  The single resistor R1 defines the light sensitivity of the circuit.  The output voltage is directly proportional to the intensity of light striking the small photodiode . . . Hobby Circuit designed by David A. Johnson P.E.-August, 2010

Linear power driver works from single supply -  07/25/02 EDN-Design Ideas In low-power, single-supply analog applications, it is often desirable to maintain precise control of voltages much greater than the positive-supply rail.  The circuit in Figure 1 allows you to amplify the input voltage, VIN, by a factor, A, which resistors R1 and R2 set.  The output voltage, VOUT, equals AVIN, where A=R2/(R1+R2] __ Circuit Design by Tom Gay, Darmstadt, Germany

Linear Thermometer -  T1 has a built in pair of thermistors with linearizing resistors custom scaled for a specific temperature range.  , 0C to 100C in this example.  The flying capacitor LTC1043 eliminates any dc loading on the precision network to maintain linearity over the entire temperature range.  Amplifier gain is scaled to provide an output __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Linear Timer for General Use -  This simple timer can be used to control any electrical appliance that needs to be switched off after certain time, like a small heater or a boiler, provided the relay-switch parameters __ Electronics Projects for You

Linearized Platinum Resistance Thermometer with ±0.025°C Accuracy Over 0 to 100°C -  Platinum RTD's are typically driven with a constant current so that their resistance value directly translates to a temperature dependant voltage.  Here the LT1001 and the LM129 create a constant current through the input 10K resistor which all flows through the sense resistor.  A second amplifier inverts the signal to provide __ Linear Technology/Analog Devices App Note, Jun 21st 2011



LM741 OpAmp Voltage Indicator -  Plans for a simple voltage high/low indicator built around an LM741 operational amplifier. __ Designed by REUK-Renewable Energy UK website

LME49710 Based Audio Amplifier -  Listening to music on a self-made system is great.  Good-quality audio amplifier circuits can be constructed with minimum components.  Described here is an LME49710 based audio amplifier.  Author’s prototype is shown __ Electronics Projects for You

Low Frequency Sine Wave Generator -  The two circuits below illustrate generating low frequency sine waves by shifting the phase of the signal through an RC network so that oscillation occurs where the total phase shift is360 degrees. __ Designed by Bill Bowden

Low Frequency Wien Bridge Sinewave Oscillators -  Three examples of Wien Bridge oscillators are shown below.  The first uses three bipolar transistors.  The second uses a bipolar and JFET, and the third is the more popular type using an op-amp for minimal parts.  The idea is to generate a 360 degree phase shift at some particular frequency using 2 resistors and caps of equal value.  One cap and resistor are in series, while another cap and resistor are in parallel.  The signal loss through the network is about 66 percent so the amplifier gain needs to be around 3 for a loop gain of 1 __ Designed by Bill Bowden

Low Noise AC Amplifier with Programmable Gain & Bandwidth -  Two LTC6910 programmable gain amplifiers can be combined to provide independent gain and bandwidth control using two 3 bit digital words.  The Gain Control PGA simply varies the circuit gain from 1 to 100.  The Bandwidth Control PGA puts signal gain inside the feedback loop of the amplifier.  As this gain is increased the effective value of feedback resistor R2 is decreased.  This pushes out the upper low pass corner frequency of the ac amplifier. __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Low Noise Hydrophone Amplifier with DC Servo -  The LT1169 achieves a new standard of excellence in noise performance for a dual JFET op amp.  For the first time low voltage noise (6nV/rtHz) is simultaneously offered with extremely low current noise (1fA/rtHz) , providing the lowest total noise for high impedance transducer applications.  Unlike most JFET op amps, the __ Linear Technology/Analog Devices App Note, Jun 21, 2011

Low Noise Single Supply Photodiode Amplifier -  Low Noise Single Supply Photodiode Amplifier Figure 1 shows the LTC6252 applied as a high performance transimpedance amplifier for a photodiode.  A low noise JFET acts as a current buffer, with R2 and R3 imposing a low frequency gain of approximately 1.  Transimpedance gain is set by feedback resistor R1 to 1MΩ.  R4 and __ Designed by Glen Brisebois-Applications Engineer-Linear Technology/Analog Devices App Notes, Feb 4th 2013

Low Noise, Low Power Photodiode Amplifier with DC Precision -  Instead of simply grounding the LT6202 noninverting input, an LTC2050 drives it (and therefore the source) exactly to where it needs to be for zero JFET gate voltage.  Output offset is 200mV and output noise is 2mVP-P measured in a 20MHz bandwidth. __ Linear Technology/Analog Devices App Note, Mar 22nd 2010

Low Part Count UXGA-Resolution Cable Driver on 5V Supply -  LT6557 UXGA-Resolution Cable Driver circuit operating from a single 5V Supply.  This circuit has a 400MHz large signal bandwidth.  Single input biasing system resistor programs eliminates then usual input divider resistors.  High resolution HD quality circuit, one of three shown. __ Linear Technology/Analog Devices App Note, Jul 2, 2012

Low Power Amp Monitors Light -  The circuit below takes advantage of a low power op amp with a “rail to rail” feature.  The single resistor R1 defines the light sensitivity of the circuit.  The output voltage is directly proportional to the intensity of light striking the small photodiode. . . Circuit by David Johnson P.E.-August, 2010

Low Power Comparator with <10uV Hysteresis -  The opamp is used as a precision comparator that drives an NPN transistor to form a logic-level output.  Controlled positive feedback into a trim pin makes precision microvolt hysteresis control practical. __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Low Power Fast Op Amps Have Low Distortion -  DN148 Design Notes __ Linear Technology/Analog Devices

Low Power Op-Amp-Audio Amp Intercom -  The example below illustrates using an op-amp as an audio amplifier for a simple intercom.  A small 8 ohm speaker is used as a microphone which is coupled to the op-amp input through a 0.1uF capacitor.  The speaker is sensitive to low frequencies and the small value capacitor serves to attenuate the lower tones and produce a better overall response.  You can experiment with different value capacitors to improve the response for various speakers.  The op-amp voltage gain is determined by the ratio of the feedback resistor to the series input resistor which is around one thousand in this case __ Designed by Bill Bowden

Low Power, Bidirectional 60V Precision Hi Side Current Sense -  Using a very precise zero-drift amplifier as a pre-amp allows for the use of a very small sense resistor in a high voltage supply line.  A floating power supply regulates the voltage across the pre-amplifier on any voltage rail up to the 60V limit of the LT1787HV circuit.  Overall gain of this circuit is 1000.  A 1mA change in __ Linear Technology/Analog Devices App Note, Mar 31st 2010

Low Side Current Sense -  Sensing the amount of current through a load on the low side has the disadvantage of raising the return connection to the load from ground.  The advantage of such an approach is that it is very easy to implement using a basic non-inverting gain stage.  The LTC6081 operates linearly down to ground also in this single supply example. __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Low-Cost Hearing Aid -  This hearing aid circuit offers the advantages of high sensitivity, low current consumption, low cost and light weight.Audio signals are sensed by the condenser microphone and amplified by two op-amps built __ Electronics Projects for You

LT1056 Improved JFET Op Amp Macromodel Slews Asymmetrically -  DN43 Design Notes __ Linear Technology/Analog Devices

LT1792/LT1097 Low Noise Hydrophone Amplifier with DC Servo -  The LT1792 achieves a new standard of excellence in noise performance for a JFET op amp.  The 4.2nV/ÖHz voltage noise combined with low current noise and picoampere bias currents make the LT1792 an ideal choice for amplifying low level signals from high impedance capacitive transducers. __ Linear Technology/Analog Devices App Note, Jun 21, 2011

LT1806: 325MHz Low Noise Rail-To-Rail SOT-23 Op Amp Saves Board Space -  DN254 Design Notes __ Linear Technology/Analog Devices

LT1880 SOT-23 Superbeta Op Amp Saves Board Space in Precision Applications -  DN266 Design Notes __ Linear Technology/Analog Devices

LT1970 Op Amp Provides On-The-Fly Adjustable Current Limit for Flexibility & Load Protection in High Current Applications -  DN298 Design Notes __ Linear Technology/Analog Devices

LT1991 Individual Battery Cell Monitor for a 4-Cell Battery -  High input impedance of LT1991 P3 and M3 inputs, (150K) , is used to eliminate errors introduced by the analog switch resistance which is very low compared to LT1991 input resistance.  The MSB signal is used to change the common mode voltage when reading the cells on the battery stack. __ Linear Technology/Analog Devices App Note, Jul 2, 2012

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