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29 Jan 2012

With a powerful relay interface module Finder 48 series you can control devices reliably and digestedly directly from a distribution box.

Very often used centralized control of devices from a distribution box via relay interface modules offers several benefits. This solution enables for example a transparent and quick installation, simple functionality test and easy changes in configuration if necessary. To place switching elements to a DIN rail can in many cases substantially increase the immunity to disturbances. It is thanks to the fact, that when a relay interface module is placed in a distribution box near a controlling electronics, wires leading to the module are very short. By this we avoid parallel layout of control wires with other power-line wires, often few tens of meters long, from which a current able to switch on a relay could be inducted in extreme cases.

Advantages / Features:

  1. relay interface module for a DIN rail
  2. versions with 1 or 2 changeover contacts
  3. 8/16A 250V AC rated current
  4. 10*10E6 mechanical life
  5. ambient temperature range -40 to +70°C
  6. only 0.5W power consumption (DC versions)
  7. contains components for EMC coil suppression and indication status LED
  8. made in EU

Finder 48 are powerful relay interface modules in versions with one or two changeover contacts. They are available with a coil for DC or AC voltage as well as with screw or screwless terminals. From our stock we offer you 2 versions – 48.52 and 48.61 with a sensitive DC coil with only a 0.5 W power consumption. Interface modules already contain components protecting against wrong voltage polarity, for EMC suppression as well as indication circuit with a LED.

Besides high 16/8A switching currents offer Finder 48 also a high level of safety thanks to an up to 6 kV insulation voltage (coil/contacts). Finder 48 enable instant relay rejection by means of a plastic retaining clip, what makes an inspection or exchange of a relay easier. Also available is the jumper link for a mutual interconnection of several interface modules. Detailed information will provide you the Finder 48 datasheet.

Control devices from a DIN rail reliably and safely - [Link]

23 Jan 2012

Giorgos Lazaridis writes:

If you have work with some kind of industrial or marine automation, then most probably you’ve heard before the term PID. PID controllers are very common in closed-loop systems today. Here is how this system can calculate and minimize the error with great precision. 

The whole story began as a marine application, when people were trying to find ways to make reliable and accurate ship steering systems. But the problem was that, if the automation turns the rudder let’s say left, the ship will not turn instantaneously, instead it needs a long course, for ships do not steer like like cars, instead they have a big hysteresis. Another problem is also that when the ship finally turns to the right direction and the automation turns the rudder straight, the ship keeps turning left due to inertia and many other parameters like waves, wind, speed etc.

At first, proportional systems were developed to do this. A proportional systems reads the feedback (electronic compass) and turns the rudder according to the angle that the ship needs to turn. If for example the ship had to turn 45 degrees left, the rudder would turn 20 degrees, and as the ship slowly turns to this direction, the rudder decreases its angle proportionally. But this system has a great disadvantage: Either the rudder will oscillate left and right because the ship will never stay on course precisely due to external disturbances, or the system will stabilize with a small constant error in angle.

PID Theory - [Link]

23 Jan 2012

Giorgos Lazaridis writes:

An AC Hum touch sensor is a very special technique, rarely used for switching applications, because it has a great disadvantage. In order to operate normally, an active AC power line has to be near by. More info about this type of touch sensor, along with other types (including the capacitance method), can be found in the corresponding theory page, how the touch buttons work..

DIY AC Hum Touch Button - [Link]

23 Jan 2012

Giorgos Lazaridis writes:

Soldering stations comes in a variety of prices and capabilities. The cheaper stations have a power controller, to control the power delivered to the soldering iron. More expensive stations will have a temperature controller near the tip of the soldering iron, and control the temperature using this feedback.

The quality of soldering with a station is much higher than with a simple soldering iron. Especially if the station has a temperature controller on the tip. That is because, the solder has a very specific working temperature. For example, the one i use (60% tin 40% lead), is liquefied at 190C. Of course, you do not solder at 190C! The soldering iron i use, exceeds by far this temperature. I measured it up to 410C! This has negative effect on the soldering quality.

Homemade Soldering Station - [Link]


22 Jan 2012

ospid.com writes:

We’ve been working hard over the last several months to build a fully-featured, open source PID controller that’s every bit as capable as its closed brethren.

There’s a bunch of information on this site regarding technical details, purchasing information, and even a quick PID primer.  Take a look around, and let us know what you think!

(If you’re so inclined, there’s also a post on my personal blog with some introductory videos)

osPID – Open Source PID Controller - [Link]

 

12 Jan 2012

Ishan Karve writes:

I work in an office where working late in the night is the norm including weekends.. This post is not about my office or about the work we do late into the night but about a problem statement posed to me by my subordinates. It goes like this..

The office or rather the building rules demand that we shut down (hard off) all electrical equipment once the office is finally shut for the day. This means that our office servers also requires to be shut down along with the UPS (APC SMART 2200). Now this has nothing to do with our office trying to be green but more to do about obviating any fire risks.

So, whats the problem. The problem is that, once we (management) leave the office, the duty staff has to shut down all the equipment including the servers. The issue is that our two servers running WindoZe 2008 R2 and WindoZe 2003 take about 15 minutes to shut down cleanly. And the UPS then needs to be shutdown afterwards. 15 minutes may seem a small time interval for an office which works routinely for 15+ hours in a day in a single shifts 7 days a week. But at night 2330 when its time to go home every minute looks like an hour to the subordinate staff. So the problem was narrated to me over a short tea break. Since I believe in working Smarter and not Harder, I decided to save 15 man minutes every day.

APC UPS Shutdown Manager - [Link]

23 Nov 2011

alternet.us.com writes:

For use with my home theater PC I developed an IR Transceiver by combining 2 projects (Receiver, Blaster). Note that this device may be taxing of your serial port, I take no responsibility for any damage you cause to your equipment. That said, I’ve provided PDF’s of the silkscreen, copper layout, and the Eagle PCB files.

IR Remote Control Transceiver- [Link]

7 Nov 2011

www.iwasz.pl writes:

So I came up with an idea of Cannon DSLR remote control. They are relatively cheap to buy on ebay, or other local online auction sites like allegro.pl here in Poland. But I wanted to build something by my self. As a complete amateur I wanted to make something small, and simple, thus DIY IR remote control for my camera was born. The protocol was reverse engineered by some smart people over the internet, so all I needed to do was to design the PCB, solder the stuff together, write a program and flash it.

Canon IR Remote - [Link]

6 Nov 2011

Camera-B-On TV-B-Gone – [via]

I have created a Camera-B-On TV-B-Gone. This fairly simple mod allows me to use my TV-B-Gone as a camera remote for my Nikon D90. In fact, this will work as a shutter remote for a lot of Nikon cameras.

If you have a USBTinyISP you can easily make a Camera-B-On by upgrading your TV-B-Gone.

Camera-B-On TV-B-Gone - [Link]

2 Nov 2011

Marc writes – [via]

Just stumbled on this application note from National Semiconductor. It’s a nice summary of standard opamp circuits with formula’s. I thought it would be a nice item for the blog.

Almost all opamp circuits you will ever need - [Link]



 
 
 

 

 

 

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