[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
Re: Random Dreamcast tomfoolery for Retrochallenge 2012
>> ...and if you're not afraid of a little electronics, it's easy to
>> build your own. One MAX232 or equivalent and a few discretes is all
>> I needed [...]
> Don't use MAX232, it's for TTL voltages. MAX3232 is an equivalent
> chip that can be used for CMOS voltages (just give it 3.3V as Vcc).
I actually did use a MAX232, at least partially because I had it on
hand. The "few discretes" level-shifted the voltages to the 3.3V the
DC expects. I didn't mind doing so, because in my experience (and it
turned out to be so here too), a MAX232 always gets the levels
backwards, so they need inverting. I usually use discretes for this
(occasionally an '04); it turned out to be no big deal to use the same
transistors for both level-shifting and inverting.
At least that's how I remember it. That circuit has been packaged up
in a plastic box for quite a while now; I should probably open it and
see how accurate my memory is.
/~\ The ASCII Mouse
\ / Ribbon Campaign
X Against HTML mouse%rodents-montreal.org@localhost
/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B
Main Index |
Thread Index |