Julian tests: 250w led driver with 2x 100w leds
Testing a low cost DC/DC boost converter with constant voltage and constant current potentiometers, suitable for driving high power LEDs.…
Julian reveals: secrets of the pwm5 – #3 profitability
How profitable was this product? Am I now retired and living on a yacht in the mediterranean?
Julian reviews: thrunite tc10 rechargeable led torch
The ThruNite TC10 is a 900 lumen 18650 lithium ion powered torch with in-torch recharging via USB. In this review,…
Julian’s kit build: banggood 15 $23 oscilloscope finale
The replacement LCD has arrived. I take extra anti-static precautions and fit the LCD. Finally, the oscilloscope works. Sort of...…
Julian looks at green stuff: #2 – hydrogen car
Why are hydrogen fuel cell cars so expensive. The technology is really very simple.
Julian looks at green stuff: #1 – british gas appliance off
I thought there might be one interesting component inside this 'green' energy saving product.
Julian’s project: electric bike upgrade to lifepo4 – #5 charging
Balance charging the 8-cell LiFePO4 battery pack using the Turnigy Accucell 8150 balance charger.
Julian’s project: electric bike upgrade to lifepo4 – #4 balance leads
Adding the balance leads for use by the low voltage alarm and the Turnigy balance charger
Julian’s postbag: #44 – inventables x-carve unboxing
Unboxing the X-Carve CNC milling, carving, routing machine sent to me by Inventables
Julian reveals: secrets of the pwm5 – #2 misjudgement
The biggest technical support headache wasn't due to poor circuit design or buggy firmware. It was due to a misunderstood…