Turn-key PCB assembly services in prototype quantities or low-volume to mid-volume production runs

Constant current/power load with AVR controlled display

Constant current or constant power loads are handy testing tools especially if you work with power supplies or want to do some extensive battery testing. Kerry D Wong has designed pretty handy load electronics which is capable to sing constant current and constant power as well. In his design he used six IRFP150N MOSFET transistors to sink the current. Op Amps ensure that current is distributed evenly among all MOSFETs. Load parameters are controlled using Microchip MCP4921 DAC which comes with internal voltage reference. Arduino microcontroller can send commands to change voltage controlling load current. Arduino reads encoder to determine the DAC output. Kerry assembled his load on overkill heatsink. So he never had to worry about overheat. Continue reading

ShiftBrite – The Brilliant Color-shifter RGB LED Module

For those who are always using LEDs in their electronics projects, you might be feeling bored with it. Honestly, there are many interesting parts of the LEDs that you’re haven’t discover it. Oh, you didn’t believe it? Hmm…, maybe this spectacular ShiftBrite is going to proof it! Technically, ShiftBrite is similar with the ordinary LED, except it equipped with a high-brightness LED module, which is containing three colors: Red, green and blue. For your information, it generally uses a simple clocked serial interface to receive a 10-bit brightness value for each color. As a result, it can play over a billion of possible colors (Sounds like a great LED module, isn’t it?) ShiftBrite is well-equipped with current control and automatic overtemperature control. Furthermore, each channel can be adjusted with a separate current control register. Also, each input is buffered and output on the other side of the module. This feature allow each ShiftBrite to repeat the signal to the next, which is enabling longer cable runs between elements without excessive loading of microcontroller I/O pins. Plus, the integrated voltage regulator… Continue reading