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Amplifier Circuits:  Operational
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Last Updated: June 02, 2021 01:44 PM

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

Op-Amp based battery voltage Monitor -  An ECU must have a way to monitor battery voltage.  Here is a simple op-amp based circuit which will illuminate the LED when the battery voltage drops to a certain level.  The turn-on point is set with R2.  You must be able to vary Vcc   (usually with a good power supply) to set the circuit.  Decide at what voltage you'd like the LED to illuminate, and apply this at Vcc.  Adjust R2 until the light just illuminates.  Use an LED which will light at the desired voltage level, and determine R3, using ohm's law   (E=IR), to keep the current flowing through the LED and op-amp to around 10mA. 

Op-amp based Nv nets -  A more complex, but more flexible way of implementing bicores and quadcores and such.  At first glance, just another bicore variation, but with a higher component count.  It seems to reverse the BEAM drive toward simplicity (i.  e.  , more parts, no apparent increase in functionality).  But wait __ Contact: Eric Seale

Opamp Based Power Amplifier -  This is a contributed project, and has some interest as a learning exercise __ Designed by Rohit Balkishan

Opamp Basics -  The op-amp is basically a differential amplifier having a large voltage gain, very high input impedance and low output impedance.  The op-amp has a "inverting" or (-) input and "noninverting" or (+) input and a single output.  The op-amp is usually powered by a dual polarity power supply in the range of +/- 5 volts to +/- 15 volts.  A simple dual polarity power __ Designed by Bill Bowden

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/ Design by Moshe Gerstenhaber and Mike Gianino, Analog Devices, Wilmington, MA

Opamp Integrator -  The integrator basically works like this: whatever current I you get flowing in R1, gets integrated across capacitor C1.  The output voltage Vo is simply the voltage across C1.  One great application of the integrator is generating a ramp voltage.  You can do this by placing a fixed voltage

OpAmp Linearizes Response of FET VCA -  09/05/02 EDN-Design Ideas   FETs find common use in VCAs(voltage-controlled amplifiers]and attenuators, in which the FET serves as a variable resistance.  A control voltage applied to the gate sets the channel resistance and overall circuit gain Design by Mike Irwin, Shawville, PQ, CanadaSeptember 5, 2002



Op-Amp Microphone Preamplifier -  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

Op-Amp Oscillators Simplify RF Design -  10/10/96 EDN-Design Ideas Figure 1 shows a novel circuit that uses a low-cost, high-speed op amp as a crystal-controlled RF sine-wave oscillator.  An op-amp oscillator offers several advantages.  Because an op amp is a complete amplifier with a high-impedance input Design by Charles Kitchin, Analog Devices, Wilmington, MA

Opamp Radio -  Here is a simple radio that is easy to build and inexpensive.  In fact, you probobly have all the parts you need in your junk box.  You'll be suprised at the great reception with this little set. __ Designed by Aaron Cake

Op-Amp Rectifier Signals Input State -  07/21/94 EDN-Design Ideas The op-amp rectifier in Fig 1 operates from a single supply and provIdeas a logic output and an LED that indicate the state of the input voltage.  The input-state indications are handy for calibration.  Because the circuit operates from a single supply, the 2.5V reference determines the level around which the circuit rectifies input waveforms Design by Lee E Scaggs, High Country TEK, Nevada City, CA

Op-Amps Basics for the beginner -  The 7 Basic Circuit Configurations for op-amps __ Designed by G.L. Chemelec

Op-Amps Basics for the beginner. -  The 7 Basic Circuit Configurations for op-amps __ Designed by G.L. Chemelec

Operational Amplifier gain & DC offset program -  Presented here is a program to find the gain and DC offset values of an operational amplifier (or op-amp).  While doing practical electronics experiments,

Operational Amplifier Selection Guide for Optimum Noise Performance #2 -  DN3 Design Notes __ Linear Technology/Analog Devices

Optical Smoke Detector -  This optical smoke detector uses a low-cost, readily-available, slotted, through-scan, infrared photo-switch.  When smoke is detected, the relay energises to activate the audio/visual warning alarm.  Fig.1 shows the circuit of the __ Electronics Projects for You

Overcurrent & Undervoltage Battery Fault Protection -  The LT6109 is a complete high side current sense device that incorporates a precision current sense amplifier, an integrated voltage reference and two comparators.  Two versions of the LT6109 are available.  The LT6109-1 has the comparators connected in opposing polarity and the LT6109-2 has the comparators connected in the same __ Linear Technology/Analog Devices App Note, Sep 7th 2011

Overcurrent Battery Fault Protection -  The LT6108 is a complete high side current sense device that incorporates a precision current sense amplifier, an integrated voltage reference and a comparator.  Two versions of the LT6108 are available.  The LT6108-1 has a latching comparator and the LT6108-2 has a non-latching comparator.  In addition, the current sense amplifier __ Linear Technology/Analog Devices App Note, Sep 7th 2011

Over-Heat Detector -  NTC thermistors are often the preferred choice for temperature sensing and control in many applications, primarily because of their small package sizes and attractive price-performance ratios.  An NTC thermistor’s sensitivity to __ Electronics Projects for You

 


Operational Amplifiers:  #'s - A        B - C      D - K       L - N       O       P - S        T - Z 


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