Quote:
Originally Posted by Mr RB  Umm just a question, do you really need to use a 3055?
They are designed to be driven from another transistor ie they are very low gain. The 3055 was just a cheap *final stage* transistor with reasonably high current and high dissipation. |
A very astute question -- I'm going to go with "no."
The 3055 is probably overkill, sort of like swatting a fly with an h-bomb, in my case.
Quote:
Originally Posted by Mr RB These days there's almost certainly a better BJT for a single component motor driver. What's your motor current range and voltage? |
I'll let you know as soon as I find out. I basically pulled an unmarked motor so I'm not really sure about that particular motor. I may try to get some measurements (or I may just get another motor for which I can get a data sheet).
I suspect it is somewhere in the 300-800mA range for runtime with stall current around 1-2A judging by a Mabuchi motor of similar size / voltage range / rpm.
The motor doesn't need anywhere near the max capacity of a 3055. It was just a convenient power BJT that radio shack had in a pinch which was less likely to overheat than TO-92 packaged transistor.
So anyway, to find a better BJT, I'll start a new thread.
24th June 2009, 09:03 PM
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