Combine two channels on that chip...?
Quote from: fungus on Feb 08, 2013, 07:35 pmCombine two channels on that chip...?Thought of that, but have gotten conflicting answers as to whether that would work or not. Doing it with one chip would also be a bit easier.
Plus, finding anyone who sells that 150 mA chip (Mos-Tech MT508) has proven to be difficult. If anyone knows of a dealer who might carry these ...
It's hard to give guarantees ... but I can't think of a commonly used circuit where it wouldn't work.
With a transistor it has a negative coefficient, the hotter it gets the lower is the resistance. Therefore when one transistor gets more current it gets hotter and so draws more current.
But...how can it draw more current if it's in a constant current circuit?
To answer your question, fungus, I'm planning an 8x8 direct drive LED matrix with LEDs that individually run on either 100 mA or 300 mA, full power (no dimming). Only one LED will be lit at a time, so total current draw at any time from all the LEDs will be that 100/300 mA figure. Will control it with an Arduino.