QS sent me an email with a link to Tiko 3D Printer that will soon sell for $179.00 It isn’t in production yet; it’s a crowd funded operation. They give more info on their website. I have a problem judging the size of the printer. It could be small and only print small objects the
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In the wiki for Joule Thief on Wikipedia, someone claimed that the Joule Thief is an Armstrong Oscillator. I dispute that claim and prove it’s wrong in the following discussion. An oscillator is capacitance and inductance ( j.omega )that forms a resonant circuit, and according to Barkhausen criterion, an amplifier that is a linear circuit
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I thought this YouTube video of power lines playing jump rope was really cute. It took a bit of work to make this video. And it looks like it has been around for a couple years. But to show how serious this is, I thought I should explain a few things about these high voltage
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I received another Designing With LEDs post today, reviewing the Feit LED replacement for a four foot two tube fluorescent light. She says it is $33 but only available from Costco. The fixture is meant to replace a four foot, two T8 tube fluorescent light fixture. The fixture is integrated – the tubes that hold
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I downloaded the free ElectroDroid app for my Samsung GS4 phone and I’ve been using it to do some simple calculations. It has various calculators, such as battery life; resistor, inductor and capacitor calculators, including resonance; LED resistor calculator; IR drop calculator for wiring and several other calculators. It also has the pinouts for many
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I just received another Designing With LEDs post about Hollywood Lighting LED replacement lamp for fluorescent fixtures. This post reviews a 48 inch T8 replacement LED lamp. Quoting from the post: I used to think triacs were electrically noisy and a crude way to dim a light, but I now understand the advantage of not
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