Search found 32 matches

by francesco
Fri Aug 10, 2007 11:40 pm
Forum: General Discussion
Topic: Strange AC Power Issue
Replies: 214
Views: 67018

Well for the lack of any other words... you won't beleive this! After 2 days maintenance has yet to show up. So I was tired of waiting and after playing around I figured I open the panel. But before doing that earlier in the day I checked my neighbor's outlet and the power there had NO problems. Now...
by francesco
Thu Aug 09, 2007 8:55 pm
Forum: General Discussion
Topic: Strange AC Power Issue
Replies: 214
Views: 67018

I shut off all the breakers in the panel and getting 2V between ground and neutral. I have a feeling it's a problem in the whole building. I have to check with the neighbor. John: unfortunately I threw the analog ones out a few months ago. I had 2 cheap ones that I bought in 1989 :) I called the ren...
by francesco
Thu Aug 09, 2007 4:46 am
Forum: General Discussion
Topic: Strange AC Power Issue
Replies: 214
Views: 67018

jwax wrote:To add another twist, francesco- Are you using a digital voltmeter, or an analog meter? A digital meter could read "different" than an analog meter, giving false results.
Yes I am using a digital one. But with all the other facts can it really be a false result?
by francesco
Wed Aug 08, 2007 10:28 pm
Forum: General Discussion
Topic: Calculating power usage (in watts)
Replies: 3
Views: 1211

Ok thanks for the input. It's just to satisfy my curiosity.
by francesco
Wed Aug 08, 2007 10:27 pm
Forum: General Discussion
Topic: Strange AC Power Issue
Replies: 214
Views: 67018

Well here we go. These are the results: hot+cold water pipe= 119V neutral+cold water pipe= 0V ground+cold water pipe= 27V I tested neutral+metal at the panel and came up with 27V. When I put the volt meter between hot and ground on the same circuit as my UPSs they beep and click constantly. When I u...
by francesco
Tue Aug 07, 2007 10:07 pm
Forum: General Discussion
Topic: Strange AC Power Issue
Replies: 214
Views: 67018

Ok, these are the results: hot+neutral=118V hot+ground=75V neutral+ground=25V What could the problem be? Get a digital multimeter that can measure AC line voltages. Place one probe in the narrow outlet slot (HOT), the other in the wide outlet slot (NEUTRAL). You should see 110V to 120V AC. With the ...
by francesco
Tue Aug 07, 2007 10:03 pm
Forum: General Discussion
Topic: Strange AC Power Issue
Replies: 214
Views: 67018

jwax wrote:Need some detail- what exactly is the indicated "fault"?
Hi John, the UPSs don't give any details. The red LED indicator is just on. Didn't have that at the other apartment.
by francesco
Tue Aug 07, 2007 5:01 pm
Forum: General Discussion
Topic: Strange AC Power Issue
Replies: 214
Views: 67018

Strange AC Power Issue

I have 3 UPSs. All of them say there is a building wiring fault, but my outlet tester says everything is good. What could possibly be wrong?
by francesco
Tue Aug 07, 2007 4:59 pm
Forum: General Discussion
Topic: Calculating power usage (in watts)
Replies: 3
Views: 1211

Calculating power usage (in watts)

Maybe this is obvious, but when looking at an AC power adapter it specifies the input and output voltage and amperage.

With an adapter:

Input: 120VAC .5A 50W
Output: 5VDC 3A 15W

Does that mean at maximum load this power supply will draw 50W of power and put out only 15W? Where does the rest go?
by francesco
Sat Jun 25, 2005 8:41 pm
Forum: General Discussion
Topic: Motherboard fan tachometer add-on
Replies: 17
Views: 4204

Re: Motherboard fan tachometer add-on

Thanks for the info.<p>I built both circuits twice each and doesn't work with any fan.<p>IR (or similar) cuircuit seems to be the only option :( I just can't find any circuits on the net
by francesco
Thu Jun 23, 2005 8:29 pm
Forum: General Discussion
Topic: Motherboard fan tachometer add-on
Replies: 17
Views: 4204

Re: Motherboard fan tachometer add-on

I found another circuit. http://freeweb.siol.net/jerman55/HP/fanStuff3a.htm<p>It uses BC108B NPN transistor. Is it the same as a 2N2222 type?
by francesco
Wed Jun 22, 2005 6:10 am
Forum: General Discussion
Topic: Motherboard fan tachometer add-on
Replies: 17
Views: 4204

Re: Motherboard fan tachometer add-on

No, I don't have a scope. I think it's the circuit's design on the fan that won't allow the tach not to work. After all non of the panaflo line has the feature.
by francesco
Tue Jun 21, 2005 10:57 pm
Forum: General Discussion
Topic: Motherboard fan tachometer add-on
Replies: 17
Views: 4204

Re: Motherboard fan tachometer add-on

The circuit above is a no go.<p>The next best thing is to use an IR circuit. The fan has 7 fins and needs to produce 2 pulses per revolution. When the fan is connected the tach line has a reading of +3VDC and also reads 3VAC. If the fan is disconnected then the tach line is +5VDC on the MB.<p>Any id...
by francesco
Sun Jun 19, 2005 10:23 pm
Forum: General Discussion
Topic: Motherboard fan tachometer add-on
Replies: 17
Views: 4204

Re: Motherboard fan tachometer add-on

Hey, what do you guys think? <p>http://tipperlinne.com/fan-tach
by francesco
Sun Jun 19, 2005 6:47 am
Forum: General Discussion
Topic: Motherboard fan tachometer add-on
Replies: 17
Views: 4204

Re: Motherboard fan tachometer add-on

The fan I'm using has very good mechanical specs (if you will). It is a $15-20 fan. I don't want to replace because of it's quality, any other fan in it's class/price don't have a tachometer either, the ones that do cost way more than $20, and I don't want to buy more and end up with a higher pile o...