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For the term "arduino programmable current source".

Joule Thief: JTEnhanced Current Input, Voltage Output Waveforms

It doesn’t seem right to call it a basic JT since the loopstick and capacitor make so much difference. So I’m calling the cap/loopstick version “JTEnhanced”. It is the basic circuit, using the 1K…

Arduino: LED Twinkler: Basic Analog Input, Digital Output, PWM

The Arduino is a flexible platform for controlling all kinds of devices from all kinds of input signals. Here I demonstrate the most basic Analog Input — a voltage from a potentiometer — and…

Electric OU: How DO Mosfets REALLY Work? Bias Current Runs Common Gate Amplifier

Once more for the LULZ. The common gate amplifier is evidently more mysterious than a pot of stone soup, but if one pays attention one may begin to become enlightened. This video is a…

Electric OU: Supplement: Calibration of Current Measuring Instruments

The Hickok moving coil meter is calibrated against Ohm’s Law using a known resistance and a regulated power supply. The measurement is compared with that made using the cheapo CenTech DMM (on sale at…