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I had a small device (the Mosfet in a lamp dimmer to be technical) burn out recently, but when it did it smoked a bit. The smell was enough to be noticeable throughout the house, so I held my breath, opened the windows and placed a fan aiming out the door to best rid the odor. After an hour...

Due to lack of available information, I have decided against a rotating platform and will use extra illumination for the shadow sides. Thanks again to those who replied.

Sorry, I don't think I was clear. Basically, I want to know the information regarding the formula: UV dose μWs/cm2 = UV intensity μW/cm2 × exposure time (seconds) Currently, for a non-rotating square object, it takes 15 minutes per side to attain the necessary 2,500 μW·s/cm2. Now, if...

I use UVC to sanitize. However, since I sometimes use HID lights, when it comes time to flip over or change the angle of objects and the light is deactivated, there is a 10-15 min cooldown period before the light will reignite. I have been thinking of using a rotating platform that would have...

Thanks, Tom, for the suggestions and tips, but unfortunately did not lead anywhere. That being said, I created a preliminary schematic after attempting to draw the device in question, but the pins and the device itself did not transfer correctly and I am nearly back to square one. I don't...

Actually, no, that was not a website I came across during my search. What is the link please? Thank you.

Ok, the device is a non-functional Rabbit Systems "white lightning" generator. These were made in the late 1980's. A similar device is here, much newer and a different design (dual mosfet driven flyback... the Rabbit unit uses a single TIP142). Not sure what happened to all of the Rabbit...

Hi, I am trying to eventually produce a schematic from a populated circuit board using the program Target 3001. I have been carefully locating and identifying as many parts on the board as possible for ease of placement later, but there is one problem: the board has an old nine pin flyback...

Well, I haven't written because the restorer I was in touch with said that single or multi aneroid capsules shouldn't matter and I should be able to get the accuracy needed in any case. So, after moving the linkage and axle bolt and adjusting them to just about every position I could try, I...

Ok, so, after your suggestion about the weight Tom, I actually did some experimentation last night as I couldn't wait until today. The relationship between increased weight simulating increased pressure versus linkage and/or bolt adjustment did confirm greater amplitude when the linkage was...

Hi Tom, Thanks for the weight idea! I will try that tomorrow. I did do a sort of rough check tonight with surprising results. I was able to fit both the barograph and a standard aneroid barometer I have here into a vacuum bag. I then inflated the bag and applied pressure. To my surprise...

Ok, I'm going to try this another way. Obviously, I'm not getting very far trying the adjustments recommended so far. I'm losing patience, not with this group of kind people, and in fact the only folks who actually showed an interest in trying to help me, but with the time taken trying to...

I understand, but I have a standard aneroid barometer I have been keeping near the unit, and I also calibrated it at the same time as the barograph, to the local weather station. Even it shows the BP a lot more closely than the barograph. Today, for example, the station reports BP of 30.32...

Hi Tom, By the curves not matching, I'm referring to the barometric pressure curve drawn over some hours by my barograph not matching the values of the local weather station, over the same time period. My curve never seems to go as high or as low as the station's. A week ago, I moved the pen...

Hi Tom, Not 32nd floor, I'm at sea level. The weather station I've been using is online and located about 5 mi away, also at sea level. The revised calibration procedure you've written above is actually what I've been trying. Just to be clear, the set pen screw moves the aneroid up or...

Hi Tom, Please ignore post #11 above. I tried to edit so I could clarify, but I didn't see a way to. Anyway, thanks for your helpful responses so far, especially detailing calibration. I've read your instructions, but I do have some remaining questions that I'm hoping you can address...

Thanks for the more complete explanation, Tom. Up until this, it has been sort of difficult for me to understand how the entire system works. Also, you've told me more in these couple of posts that I found with repeated web searching. I was able to find a few manuals on barographs, but...

Asymptotic, thanks for the reminder. Although I thought I was confident that I had checked everything, I think I discovered the source of my errors today: the pen. I had slid it off of the arm a couple of weeks back to clean it, but when I reinstalled, I hadn't noticed until today that I...

As I suspected, although there has been a slight drop in barometric pressure indication, it still isn't matching the local weather station's. Mine dropped to 29.88 or so over the last three hours, while the station dropped to 29.81, so the amplitude of my barograph is still not matching. If...

Been lucky enough to have a pressure drop within the last couple of hours. Since readjusting the linkage as shown, the line begins to show the decrease. Hard to tell yet, but I bet the amplitude still won't match the station's.

Since last replied, I've had the linkage as shown in the image, but the amplitude did not change and, according to the local weather station, it should have decreased from about 30 to 29.9. So, I have lengthened the linkage once again to the maximum and left the axle adjustment screw alone.

Thanks to you both. I just shortened the linkage, so I'll soon see what that does. I picked the barograph up at an estate sale a few weeks ago, but its total amplitude is not matching the barometric pressure of the local weather station. It is showing rising and falling curves, but not to the...

Hi. I wasn't sure where to post this. It does relate to Earth science, but still wasn't sure whether or not to post there. Anyway, I am trying to determine the proper settings of the linkage of my barograph so that the pen moves the greatest distance up or down on the chart with as minimal...

After nearly two weeks in the freezer, the vacuum in the chamber has not changed. I now feel confident using it for future projects. I did remove it from the freezer a day ago and the vacuum gauge I placed within it read correct levels once it warmed up. Apparently, the gauges are affected by...

Thanks for the replies, guys. BillTre and Tom G, you both seem pretty thorough, something I should have been before using the device as intended. However, after roughly 64 hours in the freezer under vacuum, I tested it today using the external gauge and the good news is that there has been...

Thanks, BillTre, but all may not be lost yet. I just made one discovery which could be causing reading errors. When I placed the desiccator in the freezer after vacuuming, I also placed a simple oil-filled gauge in on top of the removable tray. This internal gauge began to register vacuum...

Here is what the manufacturer says, so I am right in using the grease. I also swapped out valves for a different one, still getting loss. Any way to tell where the leak may be coming from? Can I take the unit from the freezer and tip it in a tub of water?

Ok, I have since abandoned this method since my new desiccator vacuum jar arrived, but I am having trouble, and I have added the info to my original thread. I hope someone can help.

Hello everyone, I wasn't sure whether or not to start a new thread, or continue this one. Please reread my post #4 above to get an idea of what I have been trying to do. The idea has been to freeze dry soft bodied insects for preservation. This would include caterpillars, spiders, soft...

Kuruman: I used one of https://www.foodsaver.com/accessories-and-parts/jar-and-bottle-sealers/foodsaver-wide-mouth-jar-sealer/T03-0023-01P.html and single stage pump to evacuate the jar. Unfortunately, the vacuum lid adapter seems to seal almost immediately when vacuum is reversed and I don't...

I have been using a vacuumed mason jar for a special project. Now the time has come to release vacuum in order to access internal contents, but the vacuum must be released slowly. Most jars are opened this way by placing a knife or similar object under the lid's edge under air quickly rushes...

Thanks, all. Sophiecentaur, I ordered one similar to the ones you linked to a couple of days ago. It was just under $20 US with a claimed accuracy into the 0.001 g range. It arrived today and, using the included instructions, I calibrated it to read very close to actual values. I'm very...

I currently have a cheap digital scale that will measure, say, from 1 g and beyond to the hundredth place with reasonable accuracy, but for anything less than a gram, it is erratic. For example, when I'm adding 0.15 g of a chemical, sometimes the value will change but often it will not and...

Since it will be nearly a month before the insects I desire are collectible, today I ordered some vacuum gauges similar to but less costly like these. I have two options for use: 1) either fashion a quick connect/ disconnect system like used for air compressors to only occasionally check on jar...

Each jar will have roughly 1/3 total jar volume of desiccant (drierite) added to the bottom, in accordance with the article, along with a separation screen between the desiccant and insect. With the caterpillars I dried last year, they took just one week since I had substituted a single stage...

#12 and #13 stoppers arrived today, they were drilled and 1/4" copper pipe and valves installed. I then placed each stopper on a standard mouth Mason jar. I don't yet have the plastic canisters, so the jars were placed some distance away and then vacuumed down to 29" Hg. They seemed to hold...

Although I'm planning on the mason jar inside of plastic canister method, I checked out the lyophilization flasks. Unless I'm wrong, these seem to be 100% borosilicate glass with no lip, so I'm wondering if standard, wide mouthed borosilicate jars might do the trick. Of course, I might be...

Thanks for sharing, Tom. I'm not surprised you got it down to 25" and holding up as the Foodsaver and other pumps bring it down to 20. I've decided that I'm going to place whatever jar is used inside of the plastic hermetic canisters I mentioned before. Poke a small hole in the side or top...

Very nice! The good news is that those animals are significantly larger than I will ever go and I wouldn't even want to attempt that unless I had a way better vacuum system. Actually, about the largest I'm looking at will be garden spider size. If not for the leg span of those, I probably...

I actually have some rubber stoppers on the way that I think will fit the jars. #12 and/or #13 for standard mouth and #14 for wide. I plan on drilling 1/4" holes in the center for the tubing like with the square jar stoppers I already use. The big uncertainty is how much stoppers of this size...

Sure, the hornet is the European hornet (Vespa crabro) and the reddish brown stag (Lucanus capreolus). I have plenty of cicada killers too, but I haven't yet tried freeze drying them.

Thanks, but the problem is that it sacrifices portability. I need to keep everything frozen from the start, so I would have to remove, apply vacuum, and then return and that's only if it's ok to be outside of the bucket for a month. Interesting and I may look into it, thanks. I do know that...

Thanks for your fast response. No dangers intended, and perhaps I should have further explained initially. Last year, I started freeze drying certain insects for preservation and color retention purposes. Some insects, due to their nature, are very hard to preserve well and this includes...

I'm looking for a cheap, wide mouthed jar capable of withstanding moderate vacuum (up to 29-30" Hg). The jar I've currently been using is like http://packagingoptionsdirect.com/8-oz-french-square-clear-glass-bottle-028047?gclid=EAIaIQobChMIqMnmme_g2gIVgUSGCh3frw2_EAQYAyABEgKgG_D_BwE one with a...