D
[email protected]
- Jan 1, 1970
- 0
I really am a beginner to electronics, so any help would be
appreciated. I can limp through with enough instructions, but really
don't know much on my own.
I recently bought a CRT projector for my home theatre. It has 5 fans
that are quite loud, due to air circulation and not from the spinning
of the fans themselves. On another forum related to CRT projectors,
I've read that many owners have added resistors or diodes or regulators
to slow down the fan speed. One common diode that I've read works for
my specific projector is a zener diode 5.1V 1A or 5A, which they
install between the red wire with the banded end away from the fan.
The fans by the way at Matsushita SF80 12vdc 160mA DC brushless.
I bought a set of these diodes and installed them on two of the fans so
far. Each had the same outcome, which is that the fans 95% of the time
do not start when you first turn on the projector. When I first turn
on the projector, I see that the blade moves about 1/8 inch but does
not get enough juice to pass the magnet or whatever and then just goes
back to start positiona and never starts. I did the 2nd fan since I
wanted to confirm the first fan wasn't faulty or that I did a poor
install on the first fan. But the 2nd fan did the same thing. I found
that 1 out of 20 times the fans may start. I also found that if I help
the fans start with my finger, they work fine afterwards - and they do
turn slower as intended.
I have a few questions:
1) could the problem be that I need a higher volt zener diode (mine are
5.1v) and if so what volt?
2) could the problem be that I need a higher amp zener diode (mine are
1A) and if so what amp?
3) would it help if I connected two of my 5.1v 1A zener in parralel or
series?
4) can I use a resistor to achieve the same goal and if so what type?
5) is there a way to give the fan full juice at start-up and then
restrict the juice to the same speed that the 5.1v 1A zener puts out.
I like the speed of the fans that these zener made them spin (once they
actually start), but it seems like they need more power to start
turning. I believe regulators do exactly that - is that true and if so
what type do I need?
6) are there any other electrical options to slow down my fans?
Thanks
appreciated. I can limp through with enough instructions, but really
don't know much on my own.
I recently bought a CRT projector for my home theatre. It has 5 fans
that are quite loud, due to air circulation and not from the spinning
of the fans themselves. On another forum related to CRT projectors,
I've read that many owners have added resistors or diodes or regulators
to slow down the fan speed. One common diode that I've read works for
my specific projector is a zener diode 5.1V 1A or 5A, which they
install between the red wire with the banded end away from the fan.
The fans by the way at Matsushita SF80 12vdc 160mA DC brushless.
I bought a set of these diodes and installed them on two of the fans so
far. Each had the same outcome, which is that the fans 95% of the time
do not start when you first turn on the projector. When I first turn
on the projector, I see that the blade moves about 1/8 inch but does
not get enough juice to pass the magnet or whatever and then just goes
back to start positiona and never starts. I did the 2nd fan since I
wanted to confirm the first fan wasn't faulty or that I did a poor
install on the first fan. But the 2nd fan did the same thing. I found
that 1 out of 20 times the fans may start. I also found that if I help
the fans start with my finger, they work fine afterwards - and they do
turn slower as intended.
I have a few questions:
1) could the problem be that I need a higher volt zener diode (mine are
5.1v) and if so what volt?
2) could the problem be that I need a higher amp zener diode (mine are
1A) and if so what amp?
3) would it help if I connected two of my 5.1v 1A zener in parralel or
series?
4) can I use a resistor to achieve the same goal and if so what type?
5) is there a way to give the fan full juice at start-up and then
restrict the juice to the same speed that the 5.1v 1A zener puts out.
I like the speed of the fans that these zener made them spin (once they
actually start), but it seems like they need more power to start
turning. I believe regulators do exactly that - is that true and if so
what type do I need?
6) are there any other electrical options to slow down my fans?
Thanks