Constant Current Laser Diode Driver Circuit Using OPA2350 OpAmp
https://www.electronics-lab.com/constant-current-laser-diode-driver-circuit-using-opa2350-opamp/
The voltage-controlled current source circuit can be used to drive a constant current into a signal or pump laser diode. This simple linear driver provides a cleaner drive current into a laser diode than switching PWM drivers. The basic circuit is that of a Howland current pump with a current booster (Q1) on the output […]
DIY ECG with 1 op-amp
https://www.electronics-lab.com/diy-ecg-with-1-op-amp/
A DIY ECG made from single op-amp (LM741) and 5 resistors by Scott Harden: I made surprisingly good ECG from a single op-amp and 5 resistors! An ECG (electrocardiograph, sometimes called EKG) is a graph of the electrical potential your heart produces as it beats. Seven years ago I posted DIY ECG Machine on the […]
Sensing current on the high side
https://www.electronics-lab.com/home-community-blogs-benchtalk-sensing-current-high-side/
Michael Dunn@ edn.com discuss about current sense on the high side of power source. At their heart, the majority of DC current sense circuits start with a resistance in a supply line (though magnetic field sensing is a good alternative, especially in higher-current scenarios). One simply measures the voltage drop across the resistor and scales […]
ST TS951 – 3 MHz BiCMOS R2R OPAMP
https://www.electronics-lab.com/st-ts951-3-mhz-bicmos-r2r-opamp/
A new 3 MHz BiCMOS Die Shot from zeptobars.com ST TS951 – 3 MHz BiCMOS R2R OPAMP – [Link]
Lux Meter Module
https://www.electronics-lab.com/lux-meter-module/
LUX Meter project has been design to measure the illumination. Illumination is luminous flux falling on surface area of photo diode. This illumination converted to corresponding voltage using Op-Amp circuit. Specifications Supply 9 VDC PP3 Battery @ 20 mA Onboard Photo Diode Onboard preset for calibration Range selection via jumper 10mV/LUX, 1mV/LUX, 0.1mV/LUX Interfacing is […]
Increasing cable length in precision video applications
https://www.electronics-lab.com/increasing-cable-length-in-precision-video-applications/
Maurizio tipped us about his latest article. In this article he talks about the different ways of transmitting video signal over large distances. He writes: Traditionally, the physical environment for transmitting video signals over long distances has been the shielded coax cable. Its quality and advantages are well known, and many times designers looking for […]
Understanding silicon circuits: inside the ubiquitous 741 op amp
https://www.electronics-lab.com/understanding-silicon-circuits-inside-the-ubiquitous-741-op-amp/
Ken Shirriff’s blog looks inside the famous 741 OPMAP and discuss how it’s made and how it’s working: The 741 op amp is one of the most famous and popular ICs[1] with hundreds of millions sold since its invention in 1968 by famous IC designer Dave Fullagar. In this article, I look at the silicon […]
Introduction to OPAMPs and Applications
https://www.electronics-lab.com/introduction-to-opamps-and-applications/
Operational amplifiers (OPAMPs) are high performance differential amplifiers in integrated form that can be used in many different ways. A typical OPAMP has a non-inverting input, an inverting input, two dc power pins, one output pin and a few other fine-tuning pins. On the following image you can see a typical diagram of an operational […]
Passive Infrared Detector Circuit
https://www.electronics-lab.com/passive-infrared-detector-circuit/
The infrared (IR) is invisible radiant energy, electromagnetic radiation that we cannot see with our eyes, but we can sometimes feel on our skin as heat. The infrared light falls just outside the visible spectrum, beyond the edge of what we can see as red. Most of the thermal radiation emitted by objects near room […]
Build an op amp with three discrete transistors
https://www.electronics-lab.com/build-an-op-amp-with-three-discrete-transistors/
by Lyle Russell Williams: You can use three discrete transistors to build an operational amplifier with an open-loop gain greater than 1 million (Figure 1). You bias the output at approximately one-half the supply voltage using the combined voltage drops across zener diode D1, the emitter-base voltage of input transistor Q1, and the 1V drop across […]