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Videos uploaded by user “Julian Ilett”
Logic Circuits need Decoupling Capacitors - but what is Coupling?
 
04:28
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: 27868 Julian Ilett
Review: 3A 40V Digital Buck DC/DC Converter - It's more like a Bench PSU!
 
09:41
This digitally controlled buck converter is so stacked with features, it's more like a miniature bench power supply. Input: 5V to 40V, Output: 40V 3A
Views: 98466 Julian Ilett
Practical MOSFET Tutorial #1 - Introduction and Scope
 
01:38
A practical look at MOSFETs and how to use them
Views: 37406 Julian Ilett
Charging a Car Battery with a Solar Panel and Charge Controller
 
02:35
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: 338757 Julian Ilett
Practical MOSFET Tutorial #4 - N Channel, High Side and Bootstrapping
 
07:18
Can you have an N channel MOSFET in the high side of the circuit. Yes, but there are issues!
Views: 60791 Julian Ilett
Can you light an LED from an LED?
 
04:03
An LED powered by another LED?
Views: 18630 Julian Ilett
Practical MOSFET Tutorial #3 - P Channel and the Mobility of Holes
 
05:59
P Channel MOSFETs neatly solve the problem of not wanting to break up the common ground line. But they have their own issues.
Views: 35266 Julian Ilett
Arduino PWM Tutorial #2 - How to Set PWM Frequency Accurately
 
04:58
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: 52774 Julian Ilett
Julian reveals: Secrets of the PWM5 - #1 Inspiration
 
12:00
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: 92279 Julian Ilett
High Power LED Tutorial #1 - How to Drive 1W and 3W LEDs from 12 Volts
 
07:56
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: 213155 Julian Ilett
First Look: Headway Lithium Iron Phosphate LiFePo4 10Ah Cells
 
09:46
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: 76474 Julian Ilett
Multiple PWM5 Solar Charge Controllers Charging Car Battery Bank
 
02:11
My new panel with three PWM5 solar charge controllers (www.256.co.uk). Separate feeds via diodes to the grid tie inverter
Views: 21145 Julian Ilett
How to Pick a Lock - Plastic Padlock and Picks from Banggood
 
10:35
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: 162128 Julian Ilett
First Look: DPS3012 CC CV Buck Converter with Colour LCD
 
10:04
Programmable Constant Voltage Current Step-down Control Power Supply Module I9W6 http://www.ebay.com/itm/-/282101303216
Views: 33666 Julian Ilett
Julian Investigates: How Slow is Arduino?
 
14:41
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: 85209 Julian Ilett
Introduction to the Arduino Yun #1
 
10:15
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: 96634 Julian Ilett
1-Day Project: Build Your Own Arduino Uno for $5
 
14:23
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: 1313667 Julian Ilett
Buck Converter DC/DC PSU has Voltmeter and Ammeter and a Bug!
 
06:27
A really compact buck converter with constant current control and voltage and current digital LED displays. It works well, but be careful when shorting the output terminals!
Views: 72657 Julian Ilett
Ridiculously Cheap Voltage Regulator Board uses LM2596 SMPS Chip
 
04:51
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: 131606 Julian Ilett
10 Minute Arduino Project - INA219 Current Sensor
 
10:42
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: 50702 Julian Ilett
5A PPTC PolyFuse Repairs itself Automatically after it Blows
 
04:36
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: 14434 Julian Ilett
Practical MOSFET Tutorial #2 - N Channel, Low Side and the Body Diode
 
08:25
N Channel MOSFETs need a high gate voltage to switch them on.
Views: 37679 Julian Ilett
Julian's Postbag: #48 - MPPT Solar Buck Regulator LED Display
 
11:39
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: 52014 Julian Ilett
Rui Deng DPS-5015 Buck Converter - Tomtop (part 1)
 
08:58
A look at the Rui Deng DPS-5015 http://www.tomtop.com/modules-219/p-e1973.html?aid=975 Tomtop website: http://www.tomtop.com/?aid=975 What would you like in part two? I'm thinking of putting the full 60V into the converter's input :) "Includes Paid Promotion" in this video means that the buck converter was kindly provided by Tomtop at no cost to me - there were no cash incentives for me to make this video.
Views: 33490 Julian Ilett
Arduino Power Saving Tutorial: Clock Pre-Scale and Sleep
 
14:25
Experiments to reduce current consumption of the Arduino-compatible Pro Mini.
Views: 45120 Julian Ilett
Turning on H4 Car Headlight Bulb with IRF3205 MOSFET
 
04:55
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: 147710 Julian Ilett
Using the ACS712 Hall Effect Current Sensor Module (part 1)
 
06:45
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: 266794 Julian Ilett
Julian's Postbag: #41 - AD9833 Waveform Generator
 
05:04
In today's post is a tiny Programmable Waveform Generator module based on the Analog Devices AD9833 This is what I bought: AD9833 Programmable Microprocessors Sine Square Wave DDS Signal Generator Module http://www.ebay.co.uk/itm/-/381214316569 Here's the AD9833 datasheet: http://www.analog.com/media/en/technical-documentation/data-sheets/AD9833.pdf
Views: 28783 Julian Ilett
Arduino Thrift Tutorial - Introduction to Cheap Chinese Clones
 
08:49
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: 298939 Julian Ilett
eBay Cheap & Nasty: #2 - 16340 Lithium Cell 1000mAh
 
04:56
Just 55p on eBay (about $0.77), this 16340 lithium-ion cell is cheap and nasty. Just 288mAh measured capacity and a high internal resistance of 260 milliohms. Don't buy it!
Views: 18192 Julian Ilett
How To Light Up LEDs Without Resistor Math
 
01:59
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: 89217 Julian Ilett
Investigation: Are Log Potentiometers really Logarithmic?
 
08:05
Wikipedia says that modern (cheap) log potentiometers aren't actually logarithmic at all, but constructed with separate sections of fixed resistance tracks. Time for an investigation. ETI Vocoder constructional project reproduced with permission from Wimborne Publishing Ltd. http://www.epemag.com 2 x 100K OHM Logarithmic Taper Potentiometer Pot A100K 100KA FREE SHIPPING http://www.ebay.com/itm/-/260902185815 2 x 10K OHM Logarithmic Taper Potentiometer Pot A10K 10KA FREE SHIPPING http://www.ebay.com/itm/-/280779174020 http://en.wikipedia.org/wiki/Potentiometer http://www.geofex.com/article_folders/potsecrets/potscret.htm
Views: 12507 Julian Ilett
Ming He MPT-7210A MPPT Solar Charge Controller #1
 
13:44
First look at Ming He's MPPT solar charge controller. Unit kindly supplied by Banggood.com - http://bit.lc/4Z94
Views: 37505 Julian Ilett
Review: SEPIC Buck Boost DC/DC Converter - Steps voltage up or down
 
04:26
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: 53523 Julian Ilett
Julian's Kit Build: Banggood £15 ($23) Oscilloscope (finale)
 
08:50
The replacement LCD has arrived. I take extra anti-static precautions and fit the LCD. Finally, the oscilloscope works. Sort of... http://bit.ly/1RzsbiM DSO138 DIY Digital Oscilloscope Kit Electronic Learning Kit
Views: 97702 Julian Ilett
Playing with Solar - Amorphous v Silicon Wafer
 
05:02
What's the difference between Amorphous, Monocrystalline and Polycrystalline solar panels? Are amorphous panels really better in subdued light? How can you tell mono and polycrystalline apart? Which type responds better to shading? Find out in this video.
Views: 11907 Julian Ilett
Fake LM2596HV Voltage Regulator Buck Converter Modules bought on eBay
 
10:53
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: 190397 Julian Ilett
First Look: LTC3780 Buck/Boost DC/DC Converter 10A 130W
 
15:02
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: 82301 Julian Ilett
Julian's Ardutorials: Turn an Arduino Nano into an Uno
 
09:32
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: 33518 Julian Ilett
Review: 400W Digitally Controlled DC/DC Step-Up Boost Converter
 
08:00
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: 210737 Julian Ilett
Julian's Ardutorials: Arduino Stripped Naked
 
12:55
A breadboard Arduino stripped right down to its bare essentials. Actually stripped down a bit too far - I've been a bit naughty with the LED. https://www.arduino.cc/en/Hacking/PinMapping168 https://www.arduino.cc/en/Tutorial/ArduinoToBreadboard
Views: 14845 Julian Ilett
First Look: APA102 RGB Pixel Addressable LED #1
 
12:32
Part1 of my first look at the APA102 pixel addressable LED
Views: 79532 Julian Ilett
Postbag #9: Component Tester, USB Dinky, 3V Pump, Ferrite Rings
 
09:56
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: 113233 Julian Ilett
Julian's Ardutorials: Arduino as an ISP
 
18:06
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: 30592 Julian Ilett
Dual Complementary Opto-Isolator (DCOI) High Side MOSFET Driver #1
 
04:01
Here's a simple dual opto-isolator driver for an N-channel MOSFET on the high side of the load. A very simple bootstrap circuit (capacitor/diode) provides a gate voltage twice that of the load power supply. Opto-isolators are PC817C.
Views: 19147 Julian Ilett
Tutorial: DC/DC Buck Converter Voltage and Current Regulation
 
11:25
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: 60747 Julian Ilett
Are GU10 LED spot light bulbs inherently safe or dangerous?
 
04:42
After discovering an alarmingly dangerous GU10 LED spot light, I decided to look more closely at the typical electronic circuit that sits inside these lamps.
Views: 21213 Julian Ilett
Practical MOSFET Tutorial #5 - Microcontroller Interfacing
 
09:55
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: 58528 Julian Ilett
MAX17043 LiPo Fuel Gauge connects to Arduino via I2C #1
 
09:07
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: 18875 Julian Ilett
Testing a few Cheap LED Ammeters bought on eBay
 
07:48
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: 124057 Julian Ilett