LK204-25PC Questions

The Savior · Post by **The Savior** » Thu Jan 16, 2003 3:44 pm

First, with the cable plugged in, how thick is the unit from front to back?

Second, is it possible to lower the GPO output to 7 or so volts via software? I'd really like to use this to replace my baybus, and simple on/off action is too basic for my liking.

Post by **linear** » Thu Jan 16, 2003 4:21 pm

I'll bite on the second question. No. Although with some hardware hacking you could probably design a two-GPO circuit that would cycle between four voltages. IT would absolutely require building a circuit though.

Post by **Henry** » Thu Jan 16, 2003 4:52 pm

You can turn the GPO on and off fast enough to create a fake PWM signal...

The Savior · Post by **The Savior** » Thu Jan 16, 2003 5:27 pm

linear - Would it be possible to create a circuit using a lead from my power supply and a transister hooked to the GPO so that it would only use 1 GPO per fan?

Both - Thanks for the info, I'd still like to know the thickness. It says in the manual, but the picture is too small for me to make out the numbers, and I'm not sure if that includes the seriel cable.

Post by **Henry** » Thu Jan 16, 2003 5:38 pm

from top of the bezzle to the top of the DB-9 connector is 30mm

The Savior · Post by **The Savior** » Thu Jan 16, 2003 6:13 pm

Sweet, looks the it'll fit. Once I get a bit of cash flow I'm definatly going to get me one of those.

Post by **linear** » Thu Jan 16, 2003 9:44 pm

The Savior wrote:linear - Would it be possible to create a circuit using a lead from my power supply and a transister hooked to the GPO so that it would only use 1 GPO per fan?

Both - Thanks for the info, I'd still like to know the thickness. It says in the manual, but the picture is too small for me to make out the numbers, and I'm not sure if that includes the seriel cable.

Oh, you just want ON to provide less than 12V? Sure. In fact, the tidiest way would be a voltage regulator. Look at a 7809 for example, which would step you down to 9V from 12. Very easy. A resistor would also work, but you have to actually know a bit about your fan current to spec it. The regulator, just bash it in there and have a nice day, part should cost under a dollar.

The Savior · Post by **The Savior** » Fri Jan 17, 2003 5:36 am

Actually I was wondering if it would be possible to hook a resistor or such in parallell with the 12 volt line, except there would be a transistor in there so the voltage could be controlled via the GPO. Except that's a moot point because of what Henry said about the PWM signal.