Industrial Electrical and Maintenance - Forum

Subject: DB level of multiple horns - by: TWControls

TWControls — Sun, 30 Jan 2011 00:19:55 +0100

If I have two 80 db horns, what is the total decibels?

Subject: Rectified AC for driving DC motor - by: leitmotif

leitmotif — Tue, 25 Jan 2011 09:44:11 +0100

OK I know that one should put ripple caps on rectified AC if using to drive DC motors.

In order of simplicity I would need to calculate

capacitor size given
1 motor parameters that dont change
2. change in motor speed by adjusting shunt field or by varying line voltage (harder)
3. Ripple cap that can reduce ripple from 0 to 100 % voltage and current (near impossible??)

Can we post some simple (??) formula and guidelines?
Is there any real demand for this?
Dan Bentler

Subject: Maximum number of conductors in conduit article - by: TWControls

TWControls — Sun, 02 Jan 2011 00:27:51 +0100

Another one I use a lot. Assist you in determining what size conduit you need to run.
www.patchn.com/index.php?option=com_cont...id=160&Itemid=74

Subject: 'Wire Size vs Voltage Drop - 240 VAC article - by: TWControls

TWControls — Sat, 01 Jan 2011 22:43:44 +0100

This article was actually copied from http://www.twcontrols.com. I am cleaning up that site which includes the removal of the article section. I use this one all the time
www.patchn.com/index.php?option=com_cont...id=158&Itemid=74

Suggestions welcome

Subject: Wire Size vs Voltage Drop - 480 VAC article - by: TWControls

TWControls — Sat, 01 Jan 2011 22:41:31 +0100

Subject: Standard Capacitor Values article - by: TWControls

TWControls — Sat, 01 Jan 2011 21:23:45 +0100

Probably rarely needed either these days since electronic components are rarely repaired but...

www.patchn.com/index.php?option=com_cont...id=156&Itemid=74

Subject: Capacitor color code article - by: TWControls

TWControls — Sat, 01 Jan 2011 21:08:35 +0100

Very rarely needed in today's replace instead of repair world, but still needed on occasion

www.patchn.com/index.php?option=com_cont...id=155&Itemid=74

Subject: Standard Resistor Values article - by: TWControls

TWControls — Sat, 01 Jan 2011 20:37:31 +0100

Here is a list of common resistor values.
www.patchn.com/index.php?option=com_cont...id=154&Itemid=74

Suggestions and criticism always welcome

Subject: Resistor color codes article - by: TWControls

TWControls — Sat, 01 Jan 2011 20:05:24 +0100

Pretty basic, but I can't ever seem to remember it. Someone might give it a overview for errors.

www.patchn.com/index.php?option=com_cont...id=153&Itemid=74

Suggestions welcome

Subject: New articles - by: TWControls

TWControls — Sat, 01 Jan 2011 19:57:55 +0100

I am going to start posting some new articles. Most are things that I'm constantly having to search for in the field. I thought it would be nice to have them in one place and hopefully they will be helpful to you.

If you have a particular article you would like to see then please email me

Tim