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Reviews (7)
17 November 2016
For Gamma Spectrometry-not really Geiger Counters
For Gamma Spectrometry-not really Geiger Counters.
Only shows a very weak reaction on Geiger Counters, I suppose it'd be good for testing the lower limits of your Geiger detector.
The reason I bought it was to use in my Gamma Spectrometry setup using an Nai(TL) scintillation crystal detector, run on a GC-1100A PMT driver hooked to my desktop computer.
This welding electrode (technically not a welding stick/rod) looks just like the photo; has the red tip required for id by actual welders; seems heavy as lead.
This is exactly what I wanted!
-Mike from Detroit
06 May 2020
Biggest that will fit old RC-10
32pitch is what the original RC-10 cars used. Nowadays the new cars with lipos use finer 48pitch. This 32pitch, 18 tooth gear with 1/8" shaft hole is the largest that will fit in my RC-10 without having to cut the motor mount slot to make it longer. I bought a new NiCad battery in 2019 and upgraded to this 18t 32p gear and it makes a monstrous increase in speed! The original RC-10 pinion was only 14teeth 32p for more aggressive low end acceleration in the dirt (stop and go). I'm drag racing kids on mopeds and ten speed bikes straight line, so this increases the top speed (but slightly slower take off from the starting line). I'm smokin those fools on mopeds! lol.
03 June 2018
Easy Way To Test !agic Eye
This is a green glowing EM80 tuning / magic eye tube. I just wanted to see it glow. I was able to make the glowing green fan shape slowly open and close. They make (made) round ones called "cat's eyes" that wink!
AC/Furnace and power supply were making a lot of noise in the video. I was also nervous about holding a camera and live wires--so it's lot, weird and shaky.
Here is the stupid simple way I got it to light up, and then open and close:
+250vDC to pin 9
+250vDC to 470k-660k resistor to pin 7
-250vDC to pin 2
5vDC wallwart either output to pin 4
5vDC wallwart either output to pin 5
Touched pin 1 to pin 7 momentarily to work the eye.
When I touched pin 1 to pin 7 the eye closes, but 250vDC power supply sags. I'm only doing it for a few seconds at a time. The grid voltage (g1) on pin 1 is supposed to act to choke off the power to the tube's triode to open/close the eye. It's supposed to be like -1v to -14v, but by connecting the pins I'm hitting it with almost the full -200v I think.
It worked better with a resisitor higher than 220k. Added second 220k to give 440k and it worked but still got too dim when working the eye. A third resistor made it 660k and that seemed better. That's what I uses in the video. I built a decade resistance box which I'll plug in, and then turn dials to easily set different amounts of resistance and see what works better.
My big DC electrophoresis supply was set at only 200vDC in the video: still utterly deadly!
Anyway, the drop in voltage in the power supply is either: supposed to happen (triode shutting down due to control voltage); or it's not a great idea to basically short out your power supply. Most power supplies might pop a fuse/capacitor/blow up, but I was using an electrophoresis supply which is meant to have wires dangling in water/gel for DNA testing...so it might be a little more forgiving.