Got a buck? Make a charger for LiR2032 coin cells. It could hardly be cheaper or easier.

Something had to be done with the heap of bikes in the garage. Fence panels welded along the edges made for a quick and cheap solution. ...

LED voltmeters are a cheap source of 7 segment displays and can easily be repurposed. Using the I2C protocol, a master microcontroller such ...

A street scene in Philadelphia: the first city in the USA to have fire hydrants.

A cargo trailer is a great bike accessory, especially if you can weld one together for next to nothing. This artifact bears a slight resembl...

One cheap PCB from an auction site. 1 scrap bit of copper pipe. 2 bronze pennies. Put them together and charge up a 18650 Li ion cell. ...

So if you  open up a 9 V battery, you find 6 thin 1.5 V cells inside . But what was inside that lantern battery, the rechargeable PP3, or th...

Making Arduinos was pretty laborious. The  toner transfer  went well, but drilling was a dental experience.

If the clothes iron method fails for you, try this new twist on the toner transfer process. Put a heavy hotplate on the stove and dial in ...

The affordable panier, seen wherever there are students in Philadelphia.

My flux pen recently bit the dust. Fortunately the raw material was close at hand. Making solder flux from rosin  is a snap — and a pine t...