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Amplifier Circuits:  Differential 
Differential Amplifiers:    #'s - C    D - K    L - Z 

Amplifier -- Main Page

 

Last Updated: November 30, 2017 07:37 AM


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

LCD-Bias Generator Uses Main Microcontroller as Control IC -  11/26/09  EDN-Design Ideas Control a buck-boost switch-mode regulator with the same microcontroller that sends data to an LCD __ Circuit Design by Tom Hughes, Dannemora, Auckland, New Zealand

Logic Probe -  An useful and easy to build Logic Probe with Pulse injector.  An schematic of a "digital version" is included. __ Designed by Jose Pino

Logic probe -  This logic probe uses a single CMOS IC and shows three logic conditions, High, Low and Pulsing.  In addition if the probe input is neither hi or low (the high impedance state of tri-output logic IC's) then no LED's will light.    Power from the logic probe is taken from the logic circui __ Designed by Andy Collison

Logic Probe1 with pulse TTL/CMOS -  One of the most frustrating problems with experimenting is not be able to check the logic state of TTL or CMOS ic's without the use of a triggered oscilloscope. The schematic diagram above shows a simple and inexpensive way of building a 'Logic Probe' yourself. It will provide you with three visible indicators; "Logic 1"(+, red led), "Logic 0"(-, green led), and "Pulse"(yellow led) __ Designed by Tony van Roon  VA3AVR

Logic Probe2  with pulse TTL/CMOS -  This circuit uses the four 2 input NOR gates contained within the 4001 CMOS IC, and is primarily intended for testing CMOS circuits.  The probe derives its power from the supply of the circuit being tested.  The first gate, N1, has its inputs tied together so that it operates as an inverter, and it is biased by R1 so that roughly half the supply potential appears at its output __ Designed by Tony van Roon  VA3AVR

Logic Probe3 Audible TTL/CMOS -  A logic tester with an audible indicator can be handy when troubleshooting or testing a crowded circuit board.  It allows you to keep your eyes on the circuit, rather than on a LED on the tester.  The project described in this article is just such a tester.  It provides an audible indication of the logic level of the signal presented to its input __ Designed by Tony van Roon  VA3AVR

Logic Tester -  This is a simple logic level tester with pulse stretch capability. __ Designed by The Electronic Lives Manufacturing-presented Chan

LOPIC Logic Probe with Pulser -  This project is a combinationLogic Probe and Logic Pulser.  It is capable of testing all sorts of digital and microcomputer projects.  You will find it extremely handy when designing a project as the golden rule is totest everything in steps and stages during the design-and-construction process.  If you are not sure how a Logic Probe or Pulser works

Low Voltage Instrumentation Amplifier -  Circuit Ideas for Designers App Note __ Advanced Linear Devices, Inc

Low-cost isolation Amplifier suits industrial applications -  02/03/00  EDN-Design Ideas The circuit in Figure 1a is a low-cost isolation amplifier for instrumentation applications that provIdeas as much as 500V of galvanic isolation between input and output.  The amplifier uses only one small, low-cost transformer and with little modification __ Circuit Design by Andrew Russell, Philips Semiconductors, Hazel Grove, England

Low-Cost LCD-Bias Generator Uses Main Microcontroller as Control IC -  26-Nov-09 EDN-Design Ideas Control a buck-boost switch-mode regulator with the same microcontroller that sends data to an LCD __ Circuit Design by Tom Hughes, Dannemora, Auckland, New Zealand

LT1167: Single Resistor Sets the Gain of the Best Instrumentation Amplifier -  DN182 Design Notes __ Linear Technology/Analog Devices

Lux Meter -  This is a simple Lux Meter that is suitable for beginners. __ Designed by The Electronic Lives Manufacturing-presented Chan

MAX038 Function Generator -  This is a function generator that can generates 10Hz through 20MHz in six ranges.  Analog output can select one of any wave forms, sine, triangle or square.  TTL output can select 50% fixed duty or variable pulse width. __ Designed by The Electronic Lives Manufacturing-presented Chan

Megaohm Input Impedance Gain of 10 Difference Amplifier -  THE USEFULNESS OF DIFFERENCE AMPLIFIERS IS LIMITED BY THE FACT THAT THE INPUT RESISTANCE IS EQUAL TO THE SOURCE RESISTANCE.  THE PICO-AMPERE OFFSET CURRENT AND LOW CURRENT NOISE OF THE LT1077 ALLOWS THE USE OF 1M SOURCE RESISTORS WITHOUT DEGRADATION IN PERFORMANCE.  IN ADDITION, WITH MEGAOHM RESISTORS MICROPOWER OPERATION CAN BE MAINTAINED.  This is a classic difference amplifier configuration, but with unusually hi-value resistors.  The particular input characteristics of this opamp provide the ability to retain accuracy with such high resistances without introducing undue error from noise or dc offset. __ Linear Technology/Analog Devices App Note, Jun 21, 2010

New Instrumentation Amplifiers Maximize Output Swing on Low Voltage Supplies -  DN323 Design Notes __ Linear Technology/Analog Devices

OpAmp Doubles as Instrumentation Amp -  09/15/94 EDN-Design Ideas The circuit in Fig 1 shows an ordinary, off-the-shelf, general-purpose op amp configured as an instrumentation amplifier.  Such a configuration yields an instrumentation amplifier having higher bandwidth than currently available dedicated instrumentation/ __ Circuit Design by Moshe Gerstenhaber and Mike Gianino, Analog Devices, Wilmington, MA09/15/94

Picoampere Input Current, Triple Op Amp Instrumentation Amplifier with Bias Current Cancellation -  The upper three opamps form a standard instrumentation amplifier.  The additional opamp at the bottom is used to provide a bias current into all the inputs so that the source signal loading is minimized.  The circuit takes advantage of the close matching of sections within the IC so that when the lower section is bias-canceled, __ Linear Technology/Analog Devices App Note, Jun 21, 2011

Port-Powered Temperature Meter -  This is a four-channel temperature measurement adapter that works without external power supply.  It will suitable for measuring temperature and logging its data with a PC. __ Designed by The Electronic Lives Manufacturing-presented Chan

Precision level shifter has excellent CMRR -  15-Apr-04 EDN-Design Ideas Most designers make level shifters with op amps and 1%-tolerance discrete resistors.  Discrete-resistor mismatching limits the op amp's CMMR(common-mode rejection ratio] to 40 dB, so you cannot use op amps in circuits that require high CMRR.  Differential amplifiers contain precision matched internal resistors, so ICs such as the INA133 can readily achieve CMRRs of approximately 90 dB __ Circuit Design by Ronald Mancini, Texas Instruments, Bushnell, FL

Precision Null Detector -  Precise determination of null point in AC/DC bridges helps us to evaluate accurate values of circuit components like L and C.  Here’s a null detector that has the following merits: • Same __ Electronics Projects for You

Precision peak Detector uses no precision components -  10-Jun-04 EDN-Design Ideas When you need a precision peak detector, you would usually implement it with one or several op amps and a few other associated components.  This technique usually works well unless your design requires operation higher than a few kilohertz.  In designs requiring such operation, the accuracy of the circuit severely deteriorates unless at least one of the amplifiers has a high slew rate and frequ __ Circuit Design by Jim McLucas, Longmont, CO

Precision Single-Ended to Differential Conversion -  The LT5400 is a quad resistor network with excellent matching specifications over the entire temperature range.  All four resistors can be accessed and biased independently, making the LT5400 a convenient and versatile choice for any application that can benefit from matched resistors.  These resistor networks provide precise ratiometric stability required in highly accurate difference amplifiers, voltage references and bridge circuits. __ Linear Technology/Analog Devices App Note, Mar 23, 2010

Precision, Low Power, Single-Supply, Fully Integrated Differential ADC Driver for Industrial-Level Signals  -  A PC with Windows® 2000 or Windows XP equipped with a USB 2.0 port is needed to run the PulSAR evaluation software.  , Getting Started Connect the AD7982 evaluation board to the CED1Z board.  Install the software as described at http://www.  analog.  com/en/analog-to-digital-converters/ad-converters/ad7982/products/evaluation-boardstools/CU_PulsarADC_evaluation_tools/resources/fca.  html#EVAL-CED1Z , Setup and Test An Audio Precision AP2700 source was used to provide the input signal to the AD8475.  The PulSAR evaluation software, which is LabVIEW® based, can be used to control the Audio Precision input signals and also to monitor the ADC inputs and output. __ Analog Devices from the Lab

Radio Spectrum Monitor -  This is an experimental project to analyze radio band in FFT. __ Designed by The Electronic Lives Manufacturing-presented Chan

Resistor Compensates for Instrumentation-Amp Gain Drift -  8-Oct-09 EDN-Design Ideas Temperature makes instrumentation amp's gain drift; a resistor corrects it __ Circuit Design by Kenneth Gustafsson, Karlskoga, Sweden

Resistor Network Sets Gain for Fixed-Gain Differential Amplifier -  7-Jan-10 EDN-Design Ideas Get the right amount of gain for your op-amp application __ Circuit Design by Miles Thompson, Maxim Integrated Products, Sunnyvale, CA

Revolution Meter -  Revolution meter by measuring method of strobe synchronization.  It can measure up to 100, 000 rpm in two ranges. __ Designed by The Electronic Lives Manufacturing-presented Chan

RF Isolator Uses Differential Amplifiers -  An RF isolator is a seemingly magic device that allows signals to pass in only one direction.  Signals applied to the input port are sent to the test port and signals coming into the test port can only go to the output port.  This one-way property is usually accomplished with special non-linear ferrite/magnet structures operating at very high frequencies.  Fig.1 shows an active RF isolator __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Single Amplifier Precision High Voltage Instrument Amp -  DN25 Design Notes __ Linear Technology/Analog Devices

Single Battery, Micropower, Gain = 100, Instrumentation Amplifier -  This is a classic two-opamp instrumentation configuration.  The low voltage and micropower characteristics of the LT1078 provide operation on a 3V coin-cell supply. __ Linear Technology/Analog Devices App Note, Jun 21, 2011

Single Resistor Sets the Gain of the Best Instrumentation Amplifier LT1167 -  DN182 Design Notes __ Linear Technology/Analog Devices

Single-Ended-To-Differential Converter Has Resistor-Programmable Gain -  EDN-Design Ideas -- 11/18/12    Accurately convert single-ended signals into differential with a pair of amplifiers. __ Circuit Design by moshe gerstenhaber & Sandro Herrera

Three Op Amp Instrumentation Amplifier -  Matched amplifiers are ideal for minimizing errors in a differential input gain stage.  This stage is followed by a conventional difference amplifier to provide a single ended output signal.  Resistor adjustments optimize the circuit to reject both ac and dc common mode input signals. __ Linear Technology/Analog Devices App Note, Jun 21, 2011

Transient Protection of Darlington gain block Amplifiers -  AN-60034  Application Note __ MiniCircuits.com

Transistor Differential Amplifier -  Look under the hood of most op amps, comparators or audio amplifiers, and you'll discover this powerful front-end circuit, the differential amplifier.  A simple circuit able to amplify small signals applied between its two inputs, yet reject noise signals common to both inputs.  This circuit has a unique topology: two inputs and two outputs.  Although you can tap the signal from one output only, taking the difference between (spice design)

TTL/CMOS Logic Probe1 with Pulse -  One of the most frustrating problems with experimenting is not be able to check the logic state of TTL or CMOS ic's without the use of a triggered oscilloscope. The schematic diagram above shows a simple and inexpensive way of building a 'Logic Probe' yourself. It will provide you with three visible indicators; "Logic 1"(+, red led), "Logic 0"(-, green led), and "Pulse"(yellow led) __ Designed by Tony van Roon  VA3AVR

TTL/CMOS Logic Probe2 -  This circuit uses the four 2 input NOR gates contained within the 4001 CMOS IC, and is primarily intended for testing CMOS circuits.  The probe derives its power from the supply of the circuit being tested.  The first gate, N1, has its inputs tied together so that it operates as an inverter, and it is biased by R1 so that roughly half the supply potential appears at its output __ Designed by Tony van Roon  VA3AVR

TTL/CMOS Logic Probe3 -  A logic tester with an audible indicator can be handy when troubleshooting or testing a crowded circuit board.  It allows you to keep your eyes on the circuit, rather than on a LED on the tester.  The project described in this article is just such a tester.  It provides an audible indication of the logic level of the signal presented to its input __ Designed by Tony van Roon  VA3AVR

Two Instrumentation Amps Make Accurate Voltage-To-Current Source -  14-May-09 EDN-Design Ideas Many designs require precise voltage-controlled current sources, especially in the presence of variable loads.  Common approaches, which use a few op amps and a handful of passive components, have inherent errors due to nonideal component characteristics, such as finite open-loop gain, common-mode rejection, bias current, and offset voltage __ Circuit Design by Frank Ciarlone, Analog Devices, Wilmington, MA

Two Op Amp Instrumentation Amplifier -  Just two precision amplifiers can be configured to create a differential to single ended instrumentation amplifier.  Gain of this example is 100.  Gain = R4/R3 * [1 + 1/2* (R2/R1 + R3/R4) + (R2+R3) /R5].  Trim R5 for gain accuracy. __ Linear Technology/Analog Devices App Note, Jun 21, 2011

Ultra Low Voltage Differential Amplifier -  Circuit Ideas for Designers App Note __ Advanced Linear Devices, Inc

Ultraprecise Instrumentation Amplifier Makes Robust Thermocouple Interface -  DN302 Design Notes __ Linear Technology/Analog Devices

Universal Counter -  Typical frequency counter that built by electronics hobbyists.  This counter can measure time periods and has communication interface, so that I named this "Universal Counter". __ Designed by The Electronic Lives Manufacturing-presented Chan

Use dual Op Amp in an instrumentation Amp -  01/18/07  EDN-Design Ideas Use op amps of your choice in an instrumentation amplifier __ Circuit Design by Jerald Graeme, Burr-Brown Corp, Tucson, AZ

Virtual instrument Determines magnetic core's B-H-loop characteristics -  01/05/06 EDN-Design Ideas Inexpensive solution combines a laptop, DAQ card, and LabView __ Circuit Design by Michael Nasab, Circuit Mentor, Boulder Creek, CA

Wave Captor 'SAKURA' -  This is a digital oscilloscope adapter, which is attached to the serial port of PC, and insulated them with photo-isolator.  It acquires at 8 bits, fixed 10k samples/sec. __ Designed by The Electronic Lives Manufacturing-presented Chan

Wide Common Mode Range 10x Gain Instrumentation Amplifier -  The LTC6090 is a high voltage precision operational amplifier.  The low noise, low bias current input stage is ideal for high gain configurations.  The LTC6090 has low input offset voltage, a rail-to-rail output stage, and can be run from a single 140V or split ±70V supplies __ Linear Technology/Analog Devices App Note, Feb 15th 2013


Differential Amplifiers:    #'s - C    D - K    L - Z 


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