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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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.

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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.
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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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