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Raspberry Temperature Humidity Data logger
I recently built a temperature and humidity data logger using a Raspberry Pi 3 B+ and a DHT22 sensor. My professional data logger stopped working so I decided to build my own to meet my lab needs....
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Short-time Fourier Transform
The STFFT technique is best suited for situations where the Fourier transform over the entire signal includes too many frequency artifacts from nonstationarities (statistical changes over time). Yet...
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MATLAB 2-byte Data Capture from Tektronix MSO64 Oscilloscope
The 6 series B MSO mixed signal oscilloscope from Tektronix has the lowest input noise with 12-bit resolution in today’s marketplace. Great for biophysics research in my lab. But I found that 1-byte...
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Testing Transistor DC Gain (hFE) in My Lab
hFE stands for “Hybrid parameter forward current gain, common emitter”, and is a measure of the DC current gain of a bipolar junction transistor (BJT). The hFE concept is central to transistor usage...
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Testing Resistors In My Lab
Resistors seem like a simple topic. Just Ohm’s Law: and a digital volt meter that reads resistor values in Ohms. But different resistors by size, value, tolerance, temperature compensation, age, and...
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Test Transistors with Multimeter and Semiconductor Analyzer
This article includes step-by-step tests on a variety of transistors: NPNPNPMatched pair transistorsComplimentary transistor pairsSignal vs switching transistorsSiliconGermaniumDarlingtonDevices with...
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RC and RL Circuit Simulation
Table of Contents MATLAB simulator for RC and RL circuits Simulation integrated with Flexible Output Plugins Simulation integrated with Excel Spreadsheet Simulation integrated with Arbitrary Waveform...
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Arduino Circuit Design using BME680 Sensor
BiophysicsLab.com has added Arduino to its workbench for research and client support. The Circuit The Arduino Uno and a BME680 sensor board can be used to collect accurate temperature, humidity,...
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1951 Bell Telephone Laboratories Transistor Symposium
Table of Contents Introduction Preparing the Symposium’s Book for PDF Download Download References Introduction Bell Telephone Laboratories (BTL) had an important realization: the transistor’s...
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What is this brown stuff in these milk cartons?
I have found several 1/2 gallon cartons of milk manufactured by Trader Joe’s have what looks like a brown slime at the bottom inside the milk cartons. Below, I show two example cartons of milk, one in...
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