Tag Archives: YouTube

Teardown & Repair of a SRS DS345 30MHz Synthesized Function Generator

In this episode Shahriar investigates a peculiar problem with a SRS DS345 function generator. The instrument does not appear to produce the correct output signal frequency. After some investigation it becomes clear that a few of the display digits are not active which hide the actual frequency settings. The problem is traced to a broken resistor on the display driver. The schematic of the instrument shows that the resistor is responsible for strobing the affected seven-segment digit. After the repair, the instrument’s performance is verified including the OCXO accuracy.

Teardown & Repair of a SRS DS345 30MHz Synthesized Function Generator – [Link]

ESP32 Web Server Tutorial with a BME280 Sensor

Our friends at educ8s.tv uploaded a new tutorial on their youtube channel. It’s about an ESP32 web server along with MBE280 sensor.

Welcome to another ESP32 video tutorial! In this video, we are going to build a simple HTTP Web Server on an ESP32 board with a BME280 sensor. We are also going to learn how to make some requests to it using a web browser. There is a lot to cover, so let’s get started!

ESP32 Web Server Tutorial with a BME280 Sensor – [Link]

YouTube channel IoT view counter

Kenneth Finnegan built this YouTube channel IoT view counter. He writes:

I’ve wanted an Internet connected read-out for some time now, inspired by the awesome shadow box IoT projects Becky Stern has been doing (weather, YouTube subscribers). I’m certainly not to the same level of packaging as her yet, but I’ve got a functional display working with a Hazzah and an eBay seven segment display module.

YouTube channel IoT view counter – [Link]

YouTube Subscriber Counter with Wemos D1 mini

educ8s.tv @ youtube.com uploaded a new tutorial. Nick writes:

Today we are going to build a DIY YouTube subscriber counter with a big LCD display and a 3D printed enclosure

YouTube Subscriber Counter with Wemos D1 mini – [Link]

Diode or MOSFET as a Reversed Voltage Protector

Diode or P-channel MOSFET is what you need to protect your circuit from applying reversed voltage, according to a nice video published on Afrotechmods channel.

Method 1:Diode


The simplest way is to use a diode in series with main power supply. When you connect the power source right, the diode anode is connected to positive side and the cathode will take the ground from the rest of the load which is connected to the ground.

The downside of using this method is the heat generated from the diode.
wasted power=Vf*current

So if we use a normal diode like 1n4007 for 2A:

wasted power=0.85*2=1.7W


If you connect the power source in reverse, then the diode will be off, thus protecting the circuit.


Method 1 (enhanced):Schottky Diode

In this way we can reduce the amount of power dissipated by the diode, as long Schottky Diode have a lower forward voltage compared with a normal diode.


Method 2:P-channel MOSFET


You can use P-channel MOSFET like FQP47P0. In this method, when the power supply is connected properly, the Vgs is negative (you need to be above the threshold). When we power on the device, Vs is connected to Vd through the body diode of MOSFET and the MOSFET is on, the equivalent resistance between drain and source is very near to zero, for example Rds(on)=0.026ohm for FQP47P0.

wasted power=I*I*R=2*2*0.026=0.104W

Method 2 (enhanced):P-channel MOSFET with Zener


In this method, we protect the MOSFET from applying Vgs with a limit that exceeds the breakdown voltage.

Constant Current Sources

What are Constant Current Sources? Find out how they work and why they are useful. Try the circuit!: http://goo.gl/BRpqnD

Constant Current Sources [Link]

Two books for makers that you should read!

educ8s.tv uploaded the last video of this season and it’s a different one!

The first one, is this: Practical Electronics for Inventors. Since I studied computer science and not electronics engineering at University, I needed to find a good book to study electronics myself. After a lot of search I concluded that this book was the ideal book for me. This is a fantastic book at a fantastic price! It costs less than 30$ and I think this book should be on the shelf of every electronics hobbyist or engineer. It is a big book, it is almost 1.000 pages long and covers a wide variety of topics in circuit analysis and design, from basic theory to Arduino. Each chapter includes an overview of the theory and big ideas of the subject, plus practical information for those looking to implement the ideas.

Two books for makers that you should read! [Link]

Display YouTube Stats on LCD Screen


In this guide “padeath” shows us how to use a 320×240 LCD display with Arduino UNO to display youtube statistics. The stats are updated once in a minute using the google API.

This little Instructable will show you how to use a 320×240 pixel LCD screen connected to an Arduino Uno with a network shield too, to show stats for Youtube channels.

I created this as I wanted to see how many subscribers and views I had on my channels without having to check Youtube 🙂 The stats update on the LCD screen every minute using the google api.

Display YouTube Stats on LCD Screen – [Link]

RF Isolator: Teardown and Experiments

In this video, Kerry Wong took apart a 8 to 10 GHz microwave RF isolator and did some measurements. High resolution teardown pictures here.

RF Isolator: Teardown and Experiments – [Link]

FLIR MR160 Thermal Imaging & Moisture Meter Review, Teardown & Experiments

The Signal Path Blog published another video reviewing  FLIR MR160 Thermal Imaging & Moisture Meter:

In this episode Shahriar takes a close look at the FLIR MR160 Thermal Imaging and Moisture Meter. Featuring Infrared Guided Measurement (IGM) technology powered by a FLIR Lepton® thermal imaging sensor, MR160 helps you quickly see temperature patterns that point to potential hidden moisture so you know right where to place the meter probe to capture accurate readings.

After an overview of the camera functions a full teardown of the instrument is presented. The FLIR MR160 is based on a single PIC32 processor with built-in capacitance measurement capability. The MR160 is then used to detect a moisture spot on a floor tiling. The presence of moisture is then verified with both the pin-less and pin-based moisture measurement capability of the MR160. Finally, the MR160 is also used to measure temperature variation across a bank of resistors.

FLIR MR160 Thermal Imaging & Moisture Meter Review, Teardown & Experiments – [Link]