biophysicslab

[biophysicslab]

MASTER THE FOURIER TRANSFORM AND ITS APPLICATIONS

In MATLAB and in Python This project showcases BiophysicsLab’s expertise with the Fourier Transform in both MATLAB and Python. Below are my PDF notes from Dr. Mike X Cohen’s Udemy course. Call To ActionBiophysicsLab is offering these notes for a small fee. Ron Fredericks at BiophysicsLab is available on a consulting basis to demonstrate code examples or expand on these notes to meet your…

[biophysicslab]

MATLAB 2-Byte Tektronix Scope Script

The MATLAB Script captures multiple channel traces in a 2-byte format on a Tektronix oscilloscope, plots measurements, and saves results. See discussion here: https://www.biophysicslab.com/2024/08/01/matlab-script-for-tektronix-scope-plot-and-measure/

[biophysicslab]

MATLAB Script for Tektronix Scope Plot and Measure

I present an updated script that follows current best practices using the MATLAB Instrument Control Tool Box. To start with, there is no NI-VISA. Instead, the code is based on the TCP client object instantiation. For this test setup I use a single event trigger to capture the SPI data out pin on a BME680 multifunction sensor controlled by an Arduino UNO R3. Test Setup for MATLAB Plot and…

[biophysicslab]

Analyse Arduino Uno Bootloader with MSO64B

I created a photo montage below showing how to use a mixed signal oscilloscope as a logic analyzer.  First, I establish a UART bus by connecting the analog probes to the Rx/Tx pins on the Uno board. This setup allows me to monitor the data transfer between the board and the IDE.  Then, I use the scope’s “data rate” measure option to find the boot loader baud rate 115,200.  Alternatively the…

[biophysicslab]

Arduino Simulation vs Bench

I am taking Andre’s “Crash Course Arduino and Microcontroller Development” on Udemy. As a seasoned embedded developer taking this course, I get to commit more details to memory—looking up less—for my own designs. I also use my full lab to enhance the projects during the course. Note the floppy disk connectors used to hook my meters to the breadboard. I learned this trick in Andre’s other course:…

[biophysicslab]

RC and RL Circuit Simulation

MATLAB App to simulate, display and reuse RC and RL circuit plots for current/voltage vs time

[biophysicslab]

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 each column. Each column includes a manufacturer date and product stamp (both are the same) photo. Each column also shows a closeup of the brown slime using a Teslong NTS500 Endoscope. Carton…

[biophysicslab]

1951 Bell Telephone "The Transistor"

[biophysicslab]

Master the Fourier Transform and Its Applications Using MATLAB – Open PDF

[biophysicslab]

The Transistor 1951 Bell Labs Symposia - 792 pages - PDF

The_Transistor_1951_v4

[biophysicslab]

1951 Bell Telephone Laboratories Transistor Symposium

1951 Bell Telephone Laboratories Transistor Symposium

Bell Labs had an important realization: development of the transistor was going to move a lot more quickly if they opened up the field to other companies.  So in cooperation with the military services, Bell Telephone Laboratories held the first symposium on Transistor electronics at the Murray Hill Laboratories in New Jersey, where the Transistor was invented a little more than three years prior.…

[biophysicslab]

Arduino Circuit Design using BME680 Sensor

Arduino Circuit Design using BME680 Sensor

BiophysicsLab.com has added Arduino to its workbench for research and client support. The Circuit Bill of materials: Tools: LCD screen, 16 characters x 2 lines, LCD1602 Module ( with pin header)ELEGOO UNO R3 Board ATmega328P with USB Cable (Arduino-Compatible) for ArduinoACEIRMC BME680 Digital Temperature Humidity Pressure Sensor Breakout Board Compatible for Arduino Raspberry Pi ESP8266…

[biophysicslab]

Arbitrary Wave Generator Compliments MATLAB RC and RL Circuit Simulation

Arbitrary Wave Generator Compliments MATLAB RC and RL Circuit Simulation

Material covered: MATLAB simulator for RC and RL circuits Presented here is my utility for the display and reuse of RC and RL circuit simulations. I offer both a GUI and a constructor version running from the same code base. I envision this application to be useful in electronics teaching and lab design environments. The interactive nature of the GUI allows a student to quickly appreciate the…

[biophysicslab]

Testing Resistors In My Lab

Testing Resistors In My Lab

Resistors seem like a simple topic. Just Ohm’s Law: [pmath size=17]R = I/E[/pmath] and a digital volt meter that reads resistor values in Ohms. But different resistors by size, value, tolerance, temperature compensation, age, and manufacture have a problem with noise. I present several resistor types all with the same value of 100kΩ. Each resistor is tested for stability over time and…

[biophysicslab]

Test Transistors with Multimeter and Semiconductor Analyzer

Test Transistors with Multimeter and Semiconductor Analyzer

This article includes step by step tests on a variety of transistors: NPNPNPMatched pair transistorsComplimentary transistor pairsSiliconGermaniumDarlingtonDevices with unexpected pinouts according to datasheet Special tools for handling SMD devicesPower transistors with and without shunt resistors and damper diodesKnown goodKnown badLeakyUnknown TO-92 part70 year old pre-production junction…

[biophysicslab]

Testing Transistor DC Gain (hFE) in My Lab

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 since it is a measure of small current amplification. There are several hybrid parameters within the transistor hybrid model, including hFE. The hybrid parameters model has fallen out of popularity,…

[biophysicslab]

MATLAB 2-byte Data Capture from Tektronix MSO64 Oscilloscope

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 data capture scripts have a larger than expected noise display on the MSO64. When I switched to 2-byte data capture, the results were just fine.

In this post I present a 2-byte data capture…