Videos uploaded by user “Julian Ilett”
Logic Circuits need Decoupling Capacitors - but what is Coupling?
We all know that logic circuits need decoupling capacitors, but what do they prevent? What exactly is coupling. Here I have two 7555 oscillator circuits and their behaviour is completely different when the decoupling capacitors are removed.
Views: 27148 Julian Ilett
Charging a Car Battery with a Solar Panel and Charge Controller
If you connect a solar panel directly to a car battery, it will eventually overcharge the battery and damage it. That's why you need to use a solar charge controller. This is my own design using the latest microcontroller and MOSFET circuitry. It consumes less than 1mA (that's very little) and has a neat little blue LED that tells you the battery voltage. It can also be connected in various different configurations so you can do clever things like charge two batteries from one solar panel. You can get the PWM5 from www.256.co.uk
Views: 331990 Julian Ilett
Practical MOSFET Tutorial #1 - Introduction and Scope
A practical look at MOSFETs and how to use them
Views: 36815 Julian Ilett
High Power LED Tutorial #1 - How to Drive 1W and 3W LEDs from 12 Volts
High power LEDs differ from regular LEDs in a number of respects. Firstly, current regulation using resistors is impractical so it's necessary to use a switched mode voltage and current regulator. Secondly, they generate heat which must be drawn away from the LED to prevent damage by overheating.
Views: 210213 Julian Ilett
Practical MOSFET Tutorial #4 - N Channel, High Side and Bootstrapping
Can you have an N channel MOSFET in the high side of the circuit. Yes, but there are issues!
Views: 59291 Julian Ilett
Julian reveals: Secrets of the PWM5 - #1 Inspiration
New series revealing secrets of the PWM5 solar charge controller. Soon to become an open source project, I can now reveal all of the confidential information held back while the PWM5 was a commercial product. Starting with a competing product which inspired much of the PWM5's specification and feature list, I will go on to reveal information on sales, reliability, performance and what I might have done differently in hindsight. PWM5 firmware version 1.3 is here: http://256.uk/?p=113
Views: 92073 Julian Ilett
Practical MOSFET Tutorial #3 - P Channel and the Mobility of Holes
P Channel MOSFETs neatly solve the problem of not wanting to break up the common ground line. But they have their own issues.
Views: 34671 Julian Ilett
Practical MOSFET Tutorial #2 - N Channel, Low Side and the Body Diode
N Channel MOSFETs need a high gate voltage to switch them on.
Views: 37100 Julian Ilett
First Look: Headway Lithium Iron Phosphate LiFePo4 10Ah Cells
First look and a brief play with the Headway 10Ah LiFePo4 cells which will replace a couple of failing lead-acid gel batteries in my electric bike project. http://www.eclipsebikes.com/headway-lifepo4-38120s-10ah-p-1011.html
Views: 72574 Julian Ilett
1-Day Project: Build Your Own Arduino Uno for $5
Help support Julian's Arduino videos on Patreon: https://www.patreon.com/julian256 Clones of the popular Arduino Uno are now so cheap, it's difficult to save money by building your own. But the knowledge gained from assembling an Arduino from individual parts, makes the exercise well worthwhile. ATmega328P Pin Mapping: http://arduino.cc/en/Hacking/PinMapping168 ATMEGA328P-PU Microcontrolle​r With ARDUINO UNO Bootloader good quality pic.twitter.com/tlZZ3bFvwJ http://www.ebay.com/itm/-/311131488228?roken=cUgayN&soutkn=sNpBRg via @eBay 5PCS Solderless Prototype Breadboard 170 Tie-points Arduino Shield Dovetail Slot pic.twitter.com/YPeRfbbLgr http://www.ebay.com/itm/-/201060515747?roken=cUgayN&soutkn=pE9rF8 via @eBay 10Pcs16MHz 16.000MHz 16M HZ HC-49S Inline Feet Passive Crystal Oscillator 20pF http://www.ebay.com/itm/-/201148816544?roken=cUgayN&soutkn=p7EXaU via @eBay USB2.0 6Pin CH340G Converter for STC Arduino PRO Instead of CP2102 PL2303 To TTL http://www.ebay.com/itm/USB2-0-6Pin-CH340G-Converter-for-STC-Arduino-PRO-Instead-of-CP2102-PL2303-To-TTL-/191146797242?roken=cUgayN&soutkn=H1M9Lb via @eBay £3 ($4.98) NEW UNO R3 ATmega328P CH340 Mini USB Board for Compatible-Arduino pic.twitter.com/u1ZxuU9oEz http://www.ebay.com/itm/-/311155383820?roken=cUgayN&soutkn=RMsSRl via @eBay
Views: 1296120 Julian Ilett
Turning on H4 Car Headlight Bulb with IRF3205 MOSFET
This high power MOSFET has an on-resistance of just 8mΩ, but only if the gate is raised to a sufficiently high potential relative to the source pin.
Views: 144474 Julian Ilett
Ridiculously Cheap Voltage Regulator Board uses LM2596 SMPS Chip
There must be hundreds of thousands of these little switched mode regulator modules in China just waiting to be posted to us for just £1 and 3 pence! It's a simple but very well made implementation of the LM2596 application circuit taken straight from the data sheet.
Views: 130275 Julian Ilett
How to Pick a Lock - Plastic Padlock and Picks from Banggood
This plastic padlock and 9-piece pick set from Banggood helps you learn how to pick a lock. http://bit.ly/1X4enxR - Transparent Cutaway Inside View Of Practice Padlocks Lock Trainer Skill Pick with 2keys http://bit.ly/1PxAU7l - Klom 9piece Pick Lock Tool Locksmith Tool Door Lock Opener
Views: 159311 Julian Ilett
Review: 400W Digitally Controlled DC/DC Step-Up Boost Converter
This digitally controlled boost converter makes driving high power LEDs from a 12 volt source really easy. But it has a really slow voltage rise time, so the LED takes 10 seconds or so to brighten up. NOTE: Also see Jim Conner's tests which highlight some potentially problematic bugs in this unit: http://youtu.be/Xp6uDBMn3cY Specification: Input: 6v to 40v - 15A max (fuse protected) Output: 8v to 80v - 10A max (400W max power)
Views: 207288 Julian Ilett
Arduino PWM Tutorial #2 - How to Set PWM Frequency Accurately
You can set the Arduino's PWM frequency with great accuracy by using this library. Links: http://forum.arduino.cc/index.php?topic=117425.0 https://code.google.com/p/arduino-pwm-frequency-library/
Views: 51192 Julian Ilett
Julian's Postbag: #81 - Eclectic Electronic Entities
Help support Julian's Postbag videos: https://www.patreon.com/julian256 eBay links: Soldering Iron Tip Cleaner 70mm Brass Wool Shavings Heavy Duty Cleaning Tool http://www.ebay.com/itm/-/322116240662 New 5PCS SN74HC86N 74HC86 74HC86N Quadruple 2-Input Exclusive-OR Gates DIP14 http://www.ebay.com/itm/-/222310519557 New Mini 3 Port USB 2.0 Rotating Splitter Adapter Hub For PC Laptop Notebook Mac http://www.ebay.com/itm/-/152329961130 Banggood link: DIY-Spherical-Rotating-LED-Kit-POV-Soldering-Training-Kit on Banggood: http://bit.ly/2iFWEmt
Views: 30951 Julian Ilett
Multiple PWM5 Solar Charge Controllers Charging Car Battery Bank
My new panel with three PWM5 solar charge controllers (www.256.co.uk). Separate feeds via diodes to the grid tie inverter
Views: 20819 Julian Ilett
Charge a Battery with Solar Power and feed Electricity into the Grid
Once your battery is fully charged, very little current is needed to keep it topped up. Most of the available power from your solar panels is wasted as the charge controller is mostly switched off. Enter the 12 volt grid tie inverter which can export all that solar power to your mains electricity grid, saving you money. But how do you keep your battery topped up and send surplus power to the grid at the same time? The PWM5 Solar Charge Controler from www.256.co.uk is the only charge controller with 12 volt grid tie inverter compatibility built-in. Make your solar panels really work for you.
Views: 19377 Julian Ilett
Julian's Ardutorials: Turn an Arduino Nano into an Uno
The Uno has more memory and faster upload baud rate, but the Nano has a smaller form factor. Now create the ultimate Frankenduino with the best attributes of both.
Views: 32594 Julian Ilett
5A PPTC PolyFuse Repairs itself Automatically after it Blows
This is a homebrew self-repairing 5A fuse which uses a PPTC or PolyFuse. I've also added an indicator lamp which shows when the fuse has blown. The fuse doesn't actually blow; it just flips from a low resistance to a high resistance when its temperature reaches a certain point.By removing the high current path, the fuse cools down and its low resistance is restored.
Views: 13626 Julian Ilett
Julian's Postbag: #48 - MPPT Solar Buck Regulator LED Display
An interesting little buck converter with dual LED display which claims to have an MPPT function. Unfortunately the frustrating British weather made it almost impossible to test this device. To be continued... Want more Postbag videos? I've set up a Patreon page: www.patreon.com/julian256 MPPT Solar Panel Controller 5A DC-DC Step-down CC/CV Charging Module+Digital led #new http://www.ebay.com/itm/-/181777848971
Views: 50122 Julian Ilett
Introduction to the Arduino Yun #1
After spending a colossal £55 on my new Arduino Yun, I successfully manage to upload a blinking LED sketch. But surely there's more to this board than simply the ability to upload sketches without wires.
Views: 95228 Julian Ilett
How To Light Up LEDs Without Resistor Math
Want to light up LEDs without all that resistor math? Just cheat, and use a 1k resistor on everything. It works fine for most LED types on most battery voltages.
Views: 87978 Julian Ilett
Practical MOSFET Tutorial #5 - Microcontroller Interfacing
For this tutorial to be truly practical, we need to interface the MOSFET to a microcontroller. Here, soultions are provided for N channel low side, P channel high side and N channel high side configurations.
Views: 57502 Julian Ilett
Fake LM2596HV Voltage Regulator Buck Converter Modules bought on eBay
There's a really useful variant of the LM2596 voltage regulator called the LM2596HV which can handle 60 volts on its input. But be careful - some that I bought recently turned out to be fake. At about 50v, the regulator became unstable and died which could very easily destroy whatever you have connected to the output.
Views: 187047 Julian Ilett
10 Minute Arduino Project - INA219 Current Sensor
A ten minute look at the INA219 current sensor, hooked up to an Arduino Uno, measuring the current flow from a battery to a bulb. Part of my 18650 current monitoring project. http://www.ti.com/lit/ds/symlink/ina219.pdf https://cdn-learn.adafruit.com/downloads/pdf/adafruit-ina219-current-sensor-breakout.pdf
Views: 48409 Julian Ilett
Julian's Shorts: #2 - USB Uncertainty
Understanding how USB 3.0 and USB 2.0 plugs and sockets are compatible with each other.
Views: 11440 Julian Ilett
Testing a few Cheap LED Ammeters bought on eBay
I just love these cheap LED voltmeters and ammeters you can get on eBay. Here I wire a bunch of ammeters together to see how they perform at various different currents.
Views: 122369 Julian Ilett
Resistor Values - Why 33k, 47k, 68k?
Sponsored by JLCPCB ($2 for 10 Boards): https://jlcpcb.com What's with the 33k resistor? It's value isn't a simple rounding of the calculated value 31.6k https://en.wikipedia.org/wiki/E-series_of_preferred_numbers
Views: 30171 Julian Ilett
Using the ACS712 Hall Effect Current Sensor Module (part 1)
Using the ACS712 current sensor to measure current in a circuit. Benefits are that it can measure current in the high side of the circuit, adds just 1.2 milliohms to the cuicuit to be measured and includes all the amplification electronics on chip. float amps = 0; float maxAmps = 0; float minAmps = 0; float lastAmps = 0; float noise = 0; void setup() { Serial.begin(9600); } void loop() { amps = (516 - analogRead(A0)) * 27.03 / 1023; amps = (amps + lastAmps) / 2; lastAmps = amps; maxAmps = max(maxAmps, amps); minAmps = min(minAmps, amps); noise = maxAmps - minAmps; Serial.print(amps); Serial.print(" "); Serial.println(noise); if (Serial.read() != -1) {maxAmps = amps; minAmps = amps;} delay(100); }
Views: 260398 Julian Ilett
Ming He MPT-7210A MPPT Solar Charge Controller #1
First look at Ming He's MPPT solar charge controller. Unit kindly supplied by Banggood.com - http://bit.lc/4Z94
Views: 35847 Julian Ilett
New TP4056 Lithium Cell Charger Module with Battery Protection
This is another single cell lithium charger module, but with battery protection components on board and a micro USB connector. 2PCS 5V Micro USB 1A 18650 Lithium Battery Charging Board Charger Module http://r.ebay.com/GPjliw
Views: 483313 Julian Ilett
MAX17043 LiPo Fuel Gauge connects to Arduino via I2C #1
The MAX17043 LiPo Fuel Gauge is connected to a TP4056 LiPo charger module and a 240mAh LiPo pack. LiPo Fuel Gauge Lithium battery detection module A/D conversion IIC MAX17043 http://r.ebay.com/w58Mhn IIC I2C 0.96" 128X64 TWO (B-Y)Color OLED Display Module For AVR PIC Arduino http://r.ebay.com/1YkRhT
Views: 18482 Julian Ilett
First Look: LTC3780 Buck/Boost DC/DC Converter 10A 130W
A first look at this high efficiency (up to 98%) high current (10A) DC/DC converter employing 4-switch synchronous rectification. Based on the LTC3780 controller IC. LTC3780 Automatic lifting pressure Constant voltage step up step down 10A 130W http://www.ebay.co.uk/itm/-/221595657364
Views: 80186 Julian Ilett
555 Timer Oscillator driving LED or Loudspeaker
Simple 555 oscillator circuit with LED on the output pin. But at high frequencies the LED isn't any use so a loudspeaker can be used instead.
Views: 13452 Julian Ilett
Arduino Power Saving Tutorial: Clock Pre-Scale and Sleep
Experiments to reduce current consumption of the Arduino-compatible Pro Mini.
Views: 42288 Julian Ilett
High Power Schottky Diode Reverse Leakage Current Tutorial
The 90SQ035 is alarmingly temperature dependent when it comes to reverse leakage current. But it is thermally the right way round for use as a solar blocking diode.
Views: 11973 Julian Ilett
Review: 2-Wire LED Voltmeter takes 5v to 120v DC Supply Voltage
Just received this really neat LED voltmeter. It's 2-wire, so it measures it's own supply voltage, but that can be anywhere between 5v and 120 volts. And it was only £2.29 shipped. I think it's going to be a useful little thing.
Views: 20212 Julian Ilett
Tutorial: DC/DC Buck Converter Voltage and Current Regulation
How a DC/DC converter handles the relationship between voltage and current regulation. Check out B3008 6~32V / 0~30V LED Display CNC DC-DC Constant Voltage Current Buck Module http://www.ebay.com/itm/B3008-6-32V-0-30V-LED-Display-CNC-DC-DC-Constant-Voltage-Current-Buck-Module-/321458830703?roken=cUgayN&soutkn=ujK4ZF via @eBay Check out 3A DC-DC Digital Control Step-down Module Adjustable buck converter B3603 #ARDUINO http://www.ebay.com/itm/3A-DC-DC-Digital-Control-Step-down-Module-Adjustable-buck-converter-B3603-/171417756516?roken=cUgayN&soutkn=l5hYFI via @eBay http://www.banggood.com/B3603-Precision-CNC-DC-DC-Digital-Buck-Module-Constant-Voltage-Current-p-946751.html?utm_source=youtube&utm_medium=youtube_direct&utm_campaign=JulianIlett&utm_content=sami
Views: 59712 Julian Ilett
Arduino Thrift Tutorial - Introduction to Cheap Chinese Clones
An Arduino for £2.50? Not the genuine article of course, but a cheap Chinese clone selling on eBay. Here I look at the Nano v3, the Pro Mini and the Leonardo-like Pro Micro.
Views: 296676 Julian Ilett
Review: SEPIC Buck Boost DC/DC Converter - Steps voltage up or down
The basic buck boost topology produces an inverted output, but SEPIC (Single-Ended Primary-Inductor Converter) solves that problem maintaining polarity through the system. The output voltage can be either higher or lower than the input.
Views: 52639 Julian Ilett
Autopsy: Technoline BL700 Battery Charger after 12V Fail
It was bound to happen eventually - I connected 12 volts to my Technoline BL700 battery charger and blew it up. The components inside appear to have been damaged only in the channels which had a cell inserted when I connected the 12v supply. However, it looks like the main microcontroller chip has also been destroyed.
Views: 14316 Julian Ilett
First Look: APA102 RGB Pixel Addressable LED #1
Part1 of my first look at the APA102 pixel addressable LED
Views: 78890 Julian Ilett
Postbag #9: Component Tester, USB Dinky, 3V Pump, Ferrite Rings
The postman probably doesn't like me. Small 12864 LCD Transistor Tester Capacitance ESR Meter Diode Triode MOS LCR NPN http://r.ebay.com/w6qFLq USB Power Current Voltage Tester LED Digital Mobile Car Charger Monitor Meter http://r.ebay.com/uobWwS New Mini Submersible Pumps DC Motor Pump 3V 120L/H 1.1M http://r.ebay.com/hP3vnF 0.6" Thickness Green Iron Core Power Inductor Ferrite Rings Toroid http://r.ebay.com/cLchba and the OLED charger doctor: Mini OLED USB Charger Capacity power Current Voltage Detector Tester Meter http://r.ebay.com/5nsIWf
Views: 111680 Julian Ilett
FAKE Solderless Breadboards
Watch out for poor quality MB-102 830 tie point breadboards sold on eBay. Inserting components is difficult because the 5-way contact strips don't have adequate funneling.
Views: 99786 Julian Ilett
First Play: Eachine Touch T100 Multi Chemistry Charger #1
First play with the Eachine Touch T100 multi-chemistry battery charger. Eachine Touch T100 7A 100W AC/DC Balance Charger Discharger For LiPo/NiCd/PB Battery http://bit.ly/2bvKKd1 Banggood 10th Anniversary: http://bit.ly/2birrAq
Views: 38927 Julian Ilett
Julian explains: How Arduino A/D Converters Work
A quick look at two ADC types - flash ADCs and successive approximation ADCs. Here I briefly explain how both types work and why the latter type (the type used in Arduino) is so much slower.
Views: 17182 Julian Ilett
Julian Investigates: How Slow is Arduino?
Arduino is designed to be easy to use. But what penalty does that impose on instruction execution times? Find out how direct port bit manipulations can speed things up ten fold. Plus a little look at interrupts.
Views: 79061 Julian Ilett
Drive - The Cars (Cover Version)
Cover version of the song Drive by the Cars. Recorded in home studio back in 1986. Lots of sampled 'ah's cos we just built our own sampler. Julian Ilett singing , Brett Gossage instrumentation. Photos are of Malaysia, Hong Kong, a 1 week gliding course, members of my family and a picture of my house taken with a balloon.
Views: 160416 Julian Ilett
Julian's Ardutorials: Arduino as an ISP
Turning a regular Arduino Uno into an ISP (In System Programmer). https://www.arduino.cc/en/Tutorial/ArduinoISP https://www.arduino.cc/en/Hacking/PinMapping168
Views: 29005 Julian Ilett