Re: Microprocessor controlled 4-mode driver boards
I'm not a pro in electronics, so could you please
explain to us the pros/cons of MOSFET and PWM
and their differences between "IC-regulating" ?
For the price, interested for sure !
Also, the thinner the boards, the better.
(Single cell) Flashlighs are made small and have
very limited real-estate.
I would like to see a driver able to handle 750~1000mA
from either a 3.0v and 3.7v cell.
How tall is your tallest component and what is
the thinnest assembly you can make ?
PWM is turning the light on and off quickly and by controlling the proportion the light is on in each cycle you get different levels of output. If the PWM frequency is too low, it can be noticed and annoying. Now the mainstream frequency is about 100Hz. But mine is 5KHz, absolutely not noticeable to the naked eyes.
You can think of a MOSFET as a slick switch with gold coated contacts. On the other hand a transistor is like a switch with sticky and uncoated contacts. I'm using MOSFET in both the 1AA step up circuit and the PWM circuit.
To clarify, the first kind of the 3.7V boards I mentioned above doesn't use MOSFET because the driver IC has a control pin that requires little current thus can be connected directly to the output pin of the PWM processor. But 3.0V is already at the declining part of the output chart of this board so it's not suitable for 3.0V batteries.
edit: The board sizes are listed in the first post. The 1AA version is a little taller due to the special inductor needed to achieve the high output.