Capacitor powered LED flashlight

Long time ago QVC sold a shakeable Flashlight that had no batteries just a shakeable generator and a super capacitor. This flashlight uses a 5vdc 1.5a wall wart to charge the capacitors. To figure out how long it will take to charge the flashlight you use this equation $$T=5R_{currentlimit}C$$ And for total discharge time $$T=5R_{LED}C$$ …

Yet another TV oscilloscope

In this blog post a crt TV a part and turn it into a oscilloscope. I am going to try to use a TL082 op amp to buffer and amplify the signal. It uses the deflection yoke to draw the picture on the tube. More pictures and videos will be posted here when it is …

DIY Static wrist strap

This wrist strap prevents electrostatic discharge to whatever you touch What you need: 1 meg ohm resistor(any wattage or tolerance will do Copper tape or foil a piece of wire(you can use all of the wires from a btoken cord if you like0 bracelet(This should allow the copper tape to stick) one alligator clip Step …

DIY anti-static mat

This is a very simple esd mat that anyone can build. All you need is Small nail Cardboard box A three prong cord(must be three prong so that it functions correctly) Copper foil sheets that stick(i got mine from eBay, it is used for guitars) 1 meg ohm resistor any wattage should do. Hot glue …

De Sauty’s Bridge

This bridge is good for measuring Capacitors. What you do is hookup high impedance headphones to the output(V2 in the NL5 Circuit). Then adjust the resistor(s) , you can use the calculator below to find a suitable resistance for the resistors. This works like a Wheatstone bridge except one side has capacitors. The calculator calculates …

DIY USB Rechargeable Flashlight

This flashlight is very simple to build. It uses a cellphone li-ion battery . Its rechargeable. It should only draw about 900mA from the battery. It lasted for about 74 minutes before it went too much below the light bulb voltage. I measured it while the light was off after it went dead it read …

How to change TV channel from the network

NOTE: THIS PLUGIN DOESN’T WORK USE THE DEFAULT SERIAL PORT ARDUINO BUILT-IN PLUGIN INSTEAD Here is a way to change the TV channel from Arduino, Network and computer. Here is what you will need: 1x IR LED 1x IR Receiver module 1x Arduino Board 1x NPN General Purpose Transistor 1x 470 ohm resistor 1x Mini …

How to mount small hobby solar cells, plus a USB Solar power supply?

I looked all over the internet for a way to mount these solar cells, And only come up was ones you mount on houses. So I got a cardboard box and glue gun and tried gluing them to the piece of cardboard and it was a success! I got 19 of the 0.5v 0.8A solar …

Solder Iron Foot Switch

This switch is a must for people who solder alot. It prevents the iron from overheating. Its very simple and is very cheap. Some irons like mine can heat back up fast after they have not been cooled down alot. You will need the following parts and tools: 1 foot pedal switch SPST 1 duplex …