Hi All I have finally been able to make the rollers and the belt and have finished my VDG except for the terminal. I now have a problem that I have the combs...
Elmer: Traditionally the "combs" are located on the same side. That is the bottom comb right where the belt leaves the roller and the top comb right where the ...
Dick I will try to change the position of the top brush. And no I did not try to measure the current with the terminal in place, I have not built the terminal...
Dick I tried to push the amp meters wires to the sides (plastic casing) so they would not touch but still nothing on the amp meter. But when took the top brush...
and some extra info the fluorescent light close to the top roller flashes (can be seen in the dark) as I run the machine. so there is plenty of voltage. ... ...
Elmer you wrote: The machine really is creating 4 inch sparks, well only visible in the dark, ===================================== That's more like corona,...
Dick I tested the battery as basically a volt meter, straight connection to the battery with some wires, I know it is not the right way to do it but I did not...
Dick I finally found what was wrong with the amp meter, the scale of the amp meter is printed on a thin metal sheet and when I removed that the meter worked...
Ok I made a mistake, it is not indicating 60-80 microamps the needle is being attracted to my finger when I hold the other hand close to the belt but the amp...
Elmer you wrote: When I shorted out the amp meter like you said I could not make any sparks, ============================================= If your uA meter is...
Why do you need to test the ammeter? Do you know how to calculate the value of resistor required? With a 1.5V battery, a 50uA meter requires 30Kohms total...
Steve Thanks for the info that saves me some money, the micro amp meters here are about 15 dollars, not a lot but still a simple resistor is much cheaper and I...
Steve and Elmer: I would be concerned with the validity of readings produced by a DMM while in the electrostatic field of a VDG, even without a terminal in...
Dick In the first attempt to use the amp meter I used it on the VDG, like you said shorting out the brushes but I did that while the VDG was running. For some...
Hello All, It has been awhile since I posted but I have built another unit that has a PVC roller on the bottom and a nylon roller on the top to produce a...
... You had also said you connected it directly to a 9V battery. With about 2K of internal resistance, that is about 4.5mA, which is 90 times the rated...
... With the brush shorted by 1K resistance, at 50uA there would be only 50mV, so less electric field would be present than from an AA cell. However, there...
Hi Todd, The initial breakdown voltage (called the corona inception voltage) is lower for a negatively charged terminal than for a similar diameter positively...
Steve and Elmer: You wrote: ============================================== With the brush shorted by 1K resistance, at 50uA there would be only 50mV, so less...
Dick and Steve Well it can not hurt to put the DMM on long leads to avoid the electrostatic field, and it is good to be safe then not to do it and end up with...
Did you read the rest of what I wrote? BTW, please tell me the difference between an electric field and an electrostatic field. I think you put your meter more...
As I see it the difference between an electrostatic and electric field is defined by the genesis of these fields. Technically there may be no difference so we...
Steve I never said I connected the amp meter a 9 volt battery it was a button battery in fact of about 3 volts but still way to high in amps. But in the...
Hi Elmer: I think this thread is getting a bit off topic and we are re-hashing old stuff and it probably is not helping you to advance your project. Permit me ...
Thanks Dick, that summarises the answers very well ... From: Richard Linder To: VanDeGraaffGenerator@yahoogroups.com Sent: Saturday, March 14, 2009 1:31 PM ...
Hi Elmer: By all means keep us posted on how you are doing and….when in doubt do not hesitate to post further issues and we’ll respond for sure. Off...
Hello everyone! I am new here, but wanted to let you all know that your group provided me with a lot of good information that allowed me to make a working VDG...
Hi Tyler: Welcome 1. I have photographed the VDG sparks at the Boston Museum of Science with a digital camera. It survived! I have not tried photographing my...
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