Electronics / Electrical: 2015

Monday, August 24, 2015

Solar Car + Levitators - Cool Science Toys

Magnetic Levitating Solar Motor

A look at a cool Mendocino Magnetic Levitating Solar Motor.

Friday, August 7, 2015

Quick, Easy & Cheap Homemade Magnetic Stirrer

Quick, Easy & Cheap Homemade Magnetic Stirrer & Magnetic Stir Bar.
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Quickly and crudely made with spare parts laying around in just a matter of minutes.

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Material used:
- 12v computer Fan Motor,
- Hard Drive Magnet,
- 2 Cylinder magnets as spin bar (I recommend purchasing one),
- Tupperware Bowl,
- Variable Power Supply*
* Can use just about any 5-12v power supply laying around - phone or razor charger, modem or electronics PS, etc. Just check the voltage and amperage of the motor you intend to use and compare it to the power supply. Anything over 0.5 amps likely will work.
Best to use less voltage than you motor is rated for or your spin bar may spin too fast. Add a voltage divider potentiometer or some other means to control speed if desired.

I plan to build a self contained unit with speed control & likely hot plate in the near future. This was just a quick build because I needed one right then.

Spin bar has since arrive in the mail and I have wired the magnetic stirrer to a 5v 1amp modem power supply and it works very well.

Tuesday, August 4, 2015

Homemade Magnetic Stirrer in Action

Cheap, Quick & Easy Homemade Magnetic Stirrer in Action.
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Quickly and crudely made magnetic stirrer and magnetic stir bar. This was built in a matter of minutes with material laying around. This is only temporary as I plan to build a self contained unit likely with a hot plate, but I needed one today! The homemade stir bar works and is safe enough in most situations if careful but I have stir bars arriving in the mail so this is just a temporary quick fix.

Sunday, August 2, 2015

Awesome $45 Bluetooth Speaker - Motorola SOL REPUBLIC Deck

Awesome $45 Bluetooth Speaker - Motorola SOL REPUBLIC.
Unbelievable price, electronics just keep getting cheaper and better.
First look at this awesome $45 Bluetooth wireless speaker featuring 360 degree Full Sound and Heist Mode. Purchased from Amazon.

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Sony Bluetooth Speaker: https://youtu.be/yCc54Gqs8Fk

—————————————
From Amazon:

Motorola X Sol Republic Deck Bluetooth NFC Wireless Speaker - Gunmetal - 89641N

List Price:
$199.99
Price:
$44.98
Free Shipping for Prime Members
You Save:
$155.01 (78%)

In Stock.
Product Description
Color:Gunmetal | Product Packaging:Standard Packaging
Sol Republic's 1500-00 DECK Wireless Speaker, in gunmetal, fuses the sound and style of SOL REPUBLIC with the cutting-edge technology of Motorola. Powered by 360° Full Sound, DECK lets you experience incredible sound with friends from anywhere in the room. Roam the party and still play your songs with super-power wireless that gives you up to 300 feet of freedom. Up to 5 people can pair with the device at once and take turns controlling the music. Hit the Outdoor Mode button for a boost in sound you can hear further away. Use the Stereo-Out jack to share and control music through your home or car stereo. You can even daisy chain several DECKs together for a wall of sound. Plus you can seamlessly switch from playing tunes to talking to your friends with our crystal-clear speakerphone. You’ll be blasting music or taking calls in seconds with EasyPair Bluetooth and NFC compatibility.

Product Details
Color: Gunmetal | Product Packaging: Standard Packaging
• Product Dimensions: 3.8 x 7.4 x 1.2 inches ; 11.2 ounces
• Shipping Weight: 1.4 pounds (View shipping rates and policies)
• Domestic Shipping: Item can be shipped within U.S.
• International Shipping: This item is not eligible for international shipping. Learn More
• ASIN: B00F4B2LZM
• Item model number: 1500-00
• Batteries 1 Lithium ion batteries required. (included)
• Average Customer Review: 4.4 out of 5 stars

—————

From motorola website:

THE DECK STORY
Powered by 360° full sound, DECK sounds great from anywhere in the room. And the super-power wireless feature gives you up to 300 feet of freedom to stay connected and play DJ while roaming the party.DECK's most exciting feature might be HEIST MODE™, which allows as many as FIVE people to pair at once and take turns controlling the music. Share your latest great music finds, stop your friends from playing bad tunes, or transform the party from a Barry Manilow love fest into a Deadmau5 riot.

WHAT YOU GET:

• HEIST MODE™
• R2 SOUND ENGINE
• 360° FULL SOUND
• NFC/BLUETOOTH PAIRING
• OUTDOOR BOOST
• SPEAKERPHONE
• STEREO OUT
• ONE YEAR WARRANTY

Awesome $45 Bluetooth Speaker - Motorola SOL REPUBLIC Deck

Monday, June 1, 2015

How to Test IGBT Bricks - DMM Test & Lamp Test

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How to Test IGBT Brick Modules with a Multimeter (DMM) and test IGBTs with a Lamp & Battery.
IGBT Test with the Digital Multimeter is useful when the IGBT module cannot easily be removed or isolated.
Lamp & Battery test for when the IGBT can be removed or isolated.
See end of video for diagrams.

IGBT Battery Lamp Test:

- Wire lamp in series with 12v battery and IGBT polarity respective.
Negative of battery to E, Positive of battery to lamp, other side of lamp to C.
- Touch positive of battery and gate to turn on.
- Touch negative of battery and gate to turn off.
* Note touch battery first as IBGTs are ESD sensitive and can be damaged.

IGBT Digital Multimeter (DMM) Test Procedure:

Collector-Emitter Junction test:
- With the module out of circuit remove the conductive foam and short the gate to emitter.
- With DMM in diode check mode, the collector to emitter should give a normal diode reading with positive on the emitter and negative on the collector.
- The DMM should read open or infinite with positive on the collector and negative on the emitter. Damaged IGBTs may test as shorted in both positive and negative directions, open in both directions, or resistive in both directions.
Gate test: With the DMM in resistance mode the resistance from gate to collector and gate to emitter should read infinite on a good device. A damaged device may be shorted or have resistive leakage from gate to collector and/or emitter.

SCR Powerblock Tester

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https://youtu.be/k2V-OE3VEXQ SCR Tester Circuit Diagram

This prototype device tests the Gate Trigger Current (IGT), Latching Current (IL) and Holding Current (IH) of Powerblock SCR Modules (Thyristors).

The dial, led indicator and amp panel on the left are for the gate trigger and current. The dial, led indicator and amp panel on the right are for the A/K Latch and Hold Current.
When the trigger button is pressed current must be increased with the dial until the right led lights - that is the required Gate Trigger Current displayed on the amp panel.
Now the A/K load current must be increased until the right led lights and stays on after the trigger is released. Then the SCR is latched in the On state and the current displayed on the amp panel is the required Latching Current (IL). Current can be lowered down to the Holding Current (IH) for the specific SCR under test and still stay in the On state (check data sheets). If current falls below (IH) the SCR will turn off.

This prototype was made since I couldn't find such a product on the market to test large Powerblock SCRs requiring high IGT and IL currents.

Next project after I make the final polished version of this tool is an (IPM) Intellimod IGBT tester.

Edit: 2014_04
120vac input to regulated 48VDC supply. Wire wound variable resistors for dials. This unit is designed to deliver only a few amps max.

DIY Magnet Pole Tester Hall Effect Sensor

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DIY battery powered Magnet Pole Tester. I lost the AMY6 Magnet Tester I purchased so I decided to just build one. A circuit diagram is in the video.

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Materials:
APX9141 Hall Effect Sensor,
3V Battery,
Red LED,
Blue LED,
Momentary Pushbutton Switch,
Breadboard,
56 Ohm Resistor,
Hookup Wire,

Magnetic Polarity Detector Trial Test

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Trial test of a Magnetic Polarity Detector using a hall effect sensor (APX9141) and indicator LEDs. This is just a test before I build a battery powered pen sized Magnet Pole Tester. I lost the AMY6 Magnet Tester I purchased so I decided to just build one. A circuit diagram is in the video.

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How To: Safely Discharging a Capacitor Bank

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How to safely discharge a capacitor bank.
A method to discharge large capacitor banks with an insulated high wattage resistor. This resistor and method is used to discharge large 700vdc 30+ capacitor elevator banks. The banks have two 35k ohm bleeder/balance resistors but they can take some time to discharge and in many cases can't overcome the dielectric absorption (battery action) which can be significant on larger drives I clip this discharge resistor and leave it on while work is performed.

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Sunday, May 31, 2015

LED Strips Can Be Dangerous: Temp & Amp Readings

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LED Strips Can Be Dangerous: Temperature & Amp Readings Recorded. Led strips draw more current and get hotter than most people realize.
After reading an Amazon review about strips overhearing and burning we decided to take some temperature and amperage readings. The can certainly be dangerous if not installed and powered properly.

LED Failures Part 1

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LED forced failures due to over current.
After a LED accidentally exploded on us Ryan just wanted to see what different LEDs would do with a forward biased over current condition.
See Part 2!

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SCR Powerblock Tester Circuit Diagram

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https://youtu.be/YOzw9btb--k SCR Tester in Action
Diagram of a SCR Powerblock Tester I designed and built.
Designed and tested with iCircuit on an iPad.
Note: not show in the schematic but the actual tester has two amp panels for current readout.

-----------
This prototype device tests the Gate Trigger Current (IGT), Latching Current (IL) and Holding Current (IH) of Powerblock SCR Modules (Thyristors).

The dial, led indicator and amp panel on the left are for the gate trigger and current. The dial, led indicator and amp panel on the right are for the A/K Latch and Hold Current.
When the trigger button is pressed current must be increased with the dial until the right led lights - that is the required Gate Trigger Current displayed on the amp panel.
Now the A/K load current must be increased until the right led lights and stays on after the trigger is released. Then the SCR is latched in the On state and the current displayed on the amp panel is the required Latching Current (IL). Current can be lowered down to the Holding Current (IH) for the specific SCR under test and still stay in the On state (check data sheets). If current falls below (IH) the SCR will turn off.

This prototype was made since I couldn't find such a product on the market to test large Powerblock SCRs requiring high IGT and IL currents.

Next project after I make the final polished version of this tool is an (IPM) Intellimod IGBT tester.

DIY LiPo Battery Plug Caps

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LiPo Battery Plug Connector Caps.
Protect the batteries plugs from possible short circuits which will ruin the battery and possibly start a fire.

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Dining Room LED Strips

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Three 300 LEDs RGB Flexible Strip Light Kits roughed in dining room to see how it looks. Should be cool during halloween.
Two strips wired in parallel to one controller and the other strip wired to a seperate controller.
LEDs Playlist: http://goo.gl/3rbfRf

First Look: 6W Xenon White Slim LED

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A look at two 12v 6w LEDs I found cheap.
They put out a lot of light.
For automobiles but I will probable use them for a magnetic flashlight strip.

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