| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 2326.1 | | MTWAIN::MACDONALD | WA1OMM 7.093/145.05/223.58 AX.25 | Mon Mar 06 1989 15:47 | 5 |
| I believe the newer models have the fan mounted with screws. At
least mine is. And, I can't say for sure what the voltage is. I
believe it is 12 volts. I put a 10Kohm potentiometer on mine and
mounted it on one of the removable panels on the back. It reduces
the speed and the noise.
|
| 2326.2 | special 2-pin plug | JFRSON::OSBORNE | Blade Walker | Tue Mar 07 1989 09:35 | 9 |
| > where is everyone tying into the 12 volt supply?
There is a little 2-pin connector on the pc board directly "behind" the
fan, between a transformer and a capacitor. This is where my old fan,
which was 12VDC at approx 2 amps, was plugged in. It was also mounted
with screws. The Panaflow fan from Digi-view turned out to be a *tight*
fit, but works fine.
John O
|
| 2326.3 | I've got the plans- "Aber Lesen Sie Deutsch?" | TSECAD::BURWEN | | Tue Mar 07 1989 13:17 | 11 |
| Just out of the blue, I started writing to a pen pal in Germany
who has an Amiga. He remarked that the German articles are better
than the American ones, and despite my patiotic inclinations I would
have to agree. The article he sent me, contains complete plans
for building a voltage regulator complete with all connections shown
for tying this into the existing fans, and he reports to me that
it really gets rids of that "Lautstarke". If you sprech any Deutsch
I'll be happy to send you a copy.
Cheers,
Rick Burwen
|
| 2326.4 | | MANTIS::LONG | | Wed Mar 08 1989 10:06 | 7 |
| Must be my chassie version as I'm not finding things in the same position as
everyone else. What I did was steal power from the power connector for the
second internal floppy which I won't be using anyway. Oh the joys of having
an early version system. At least I can hear now.
Thanks,
Dick
|
| 2326.5 | Here's one answer at least! | TSECAD::BURWEN | | Wed Mar 08 1989 15:47 | 22 |
| Dick:
I just finally got around to translating the German article,
I mentioned. I can't answer the question about why your fans are
labelled 120 VAC, but I can try with the other question. According
to the article the two wires that go to the fan are d-c voltages.
The article says to cut both of these and insert a series regulator
in between. The red wire is the positive d-c and the blue wire
is the minus side (return). The output voltage of the regulator
is +6.5 V dc and they have placed a thermistor (NTC-negative temp
coeff. resistor) in order to boost the voltage slightly when the
cabinet gets slightly warmer.
I can send you the English translation and the circuit diagram
if you like, but first you'll need an answer on your original question
about the 120VAC. My article is obviously presuming you've got
low voltage dc. By the way, the circuit is simple enough, but if
you know anything about regulator design you might prefer to use
an I.C.- this uses discrete. Good luck.
Cheers,
Rick
|
| 2326.6 | Then I'll only go deaf when it's hot! | MANTIS::LONG | | Thu Mar 09 1989 07:59 | 9 |
| Rick,
Yes, please post it. I measured the lines to the fan ( not only says
120 VAC on the fan, but measures 120 VAC also ). Also, I seem to be the only one
that didn't have the fan mounted with screws so I probably have a very early
2000. The circuit you describe would be great to shut the fan ( and the noise
) back when the need for cooling is less.
Thanks,
Dick
|
| 2326.7 | | WJG::GUINEAU | | Tue Jun 12 1990 10:32 | 18 |
| > Dick:
>
> I just finally got around to translating the German article,
> I mentioned. I can't answer the question about why your fans are
> labelled 120 VAC, but I can try with the other question. According
> to the article the two wires that go to the fan are d-c voltages.
> The article says to cut both of these and insert a series regulator
Time to revisit the A2000 fan noise! I installed a Radio Shack fan (no grommets
though) without much improvement.
Before I utilize my Software Engineer skills and design a thermistor
regulated fan speed control circuit, has someone successfully done this?
Where is the best location for the thermistor?
john
|