With a used printer and a handful of inexpensive parts you can make your own old school plotter. I remember when plotters were all the rage, if you had a high end one it could even handle multiple colored pens and change them automatically. If you are interested in creating some technology of the past the Junk Plus Arduino blog demonstrates how to make your own. ” Junk (the
   There are lots of simply boxes to test servo motors but there is a bit of a void when it comes to stepper motor testers. Kenneth Weiss has built the Easy Stepper Motor Controller to fill the need. By plugging in some power and the stepper, you will be able to start testing in seconds instead of writing some sample code, building up a driver circuit etc. When
With high output LEDs falling in price it might finally be the time to add them into some inexpensive projects. Julian Ilett made a holder using a chunk of wood where a few power tool batteries can slide into. The LED is bolted to some metal which will allow it to run for some time but not long durations since the LED module does generate quite a bit of
Maxxarcade demonstrates a QSC A21 Amplifier Repair, the defective amp would blow the fuse on power up. He has an interesting technique of using a variac and a low wattage light bulb in series with the power input to lessen the current draw to prevent additional damage. The over current prevention technique didn’t allow the amp to draw enough power to work properly and sound good but it proved
