Claimed OU circuit of Rosemary Ainslie

[fuzzytomcat]

Hi everyone,

Attention members making actual replications, some of you like myself may be in need of, or more of the "International Rectifier" IRFPG50 and may have found it difficult to find at a reasonable cost and a supplier in the USA.

http://www.questcomp.com/

Quest Components, Inc. 250 Turnbull Canyon Road Industry, CA 91745

Part Number Search Results IRFPG50
http://www.questcomp.com/QuestDetailsAll.aspx?pn=IRFPG50&pnid=91660&stock=Yes

530 available

These are at $1.95 US each there is a minimum order of $25.00 US , so .......
that is a Quantity of (13) with instant 5% rebate and shipping for $30.58 US delivered ..... not bad ..... cheaper than the last ones !!

Fuzzy

[newbie123]

LOL. Im not so sure this is a "big boy thread" in any sense of the word.
AC

I agree, this thread has been pretty much derailed by Capn and Wilby...    It was somewhat productive for a while.

[Cap-Z-ro]

It turned into a troll thread because of you and your band of trolls...which is why you resurfaced it.

You need your daily troll thread to play in don't you ?...you are far too obvious.

Lack of gray matter...you are there.

[MileHigh]

There is nothing Anslie-centric going on on the Eastasia thread either.  The Oceania thread will recover if there is any news.  A few new faces chimed in and said that they would replicate but no news.  No news from Aaron with the rundown tests and the DSO.  We're watching you.

Another slow news day.

MileHigh

[MileHigh]

*News Flash*

Aaron:

It looks like you have found a frequency that's close to the frequency the capacitive touch lamp circuit runs at when you touch it, so you are simulating a touch by bombarding the area with EMI.

Anything that is running moderate power like your setup and has square waves or very high frequencies in it will emmanate a lot of RF over a wide spectrum.

Now for some major pointers on your DSO.  Instead of just watching a blurry updating display when you set up one of your oscillation modes, you want to do a "one shot" capture, and fill up the DSO's waveform memory with your snapshot.  Then you have a single static capture of an oscillation event, and you can examine it in detail be scrolling through it and zooming in and out on it.

From your manual:

Capturing a Single-Shot Signal
The reliability of a reed relay in a piece of equipment has been poor
and you need to investigate the problem. You suspect that the relay
contacts arc when the relay opens. The fastest you can open and
close the relay is about once per minute so you need to capture the
voltage across the relay as a single-shot acquisition.
To set up for a single-shot acquisition, do these steps:
1. Adjust the vertical SCALE and horizontal SCALE to appropriate
ranges for the signal you expect to see.
2. Push the acquire MENU button.
3. Push the Resolution screen button.
4. Select Normal acquisition resolution.
5. Push the SINGLE SEQ (single sequence) button.

Optimizing the Acquisition
The initial acquisition shows the relay contact beginning to open at
the trigger point. This is followed by a large spikes that indicate
contact bounce and inductance in the circuit. The inductance can
cause contact arcing and premature relay failure.
Before you take the next acquisition, you can adjust the vertical and
horizontal controls to give you a preview of how the next acquisition
might appear. As you adjust these controls, the current acquisition is
repositioned, expanded, or compressed. This preview is useful to
optimize the settings before the next single-shot event is captured.
When next acquisition is captured with the new vertical and
horizontal settings, you can see more detail about the relay contact
opening. You can now see that the contact bounces several times as
it opens.

Using the Horizontal Zoom Function
If you want to take a close look at a particular spot on the acquired
waveform, use the horizontal zoom function. To look closely at the
point where the relay contact first begins to open, do these steps:
1. Push the zoom button .
2. Use the horizontal POSITION to place the expansion point close
to where the relay contact begins to open.
3. Adjust the horizontal SCALE to magnify the waveform around
the expansion point.
The ragged waveform and the inductive load in the circuit suggest
that the relay contact may be arcing as it opens.
The

Have fun,

MileHigh