Radium212 - 26-12-2017 at 03:34
https://photos.google.com/photo/AF1QipPNAjc2LYZt1TUiDYWsPC3L... Is this a good circuit for a Geiger counter with a range selector? Will it work?
aga - 26-12-2017 at 08:51
Hints and tips: make sure the link works or nobody can see what you're referring to.
Radium212 - 27-12-2017 at 02:02
Works perfectly fine for me. Just to state, it's the circuit itself that's important, not the component values.
Cryolite. - 27-12-2017 at 02:06
Broken for me too.
unionised - 27-12-2017 at 03:31
Doesn't work for me; asks for log-in details.
That's hardly the point.
If it doesn't work for some people then it's the OP's responsibility to make it work, rather than saying "it works for me"
[Edited on 27-12-17 by unionised]
Radium212 - 29-12-2017 at 12:04
Ok, sorry I didn't know Google photos worked like that, my error, sorry. But to describe it, it's a simple 400V power supply, which I know works. The
part which I want to know about is the range selector I designed. It's just a rotary switch with the main pole connected to the tube cathode, then on
the three other poles, a 10 Ohm, 1k Ohm, and 10k Ohm resistor. It allows you to select the measurement range. All resistors go to the meter. Does that
seem sensible.
aga - 29-12-2017 at 13:31
Silly question, and failed post, entirely, especially for a chemistry forum that does not specialise in electronics.
If it were electronics, the specifics of the particular geiger tube would be needed to make any judgement at all.
Google 'Geiger Counter Circuit'
Also look on Ebay - sometimes just buying the thing is cheaper than making one.
phlogiston - 29-12-2017 at 16:48
You should really post the circuit. I don't think we need the datasheet for the geiger tube itself, but your description of the circuit you intend to
build is not clear enough I am afraid. I can speculate and guess a bit, but we can have a focused, efficient discussion if you could share the
circuit.
[Edited on 30-12-2017 by phlogiston]
NEMO-Chemistry - 29-12-2017 at 16:57
Make sure the switch is rated for 400V, what W are the resistors and much power they need to dissipate?
Radium212 - 1-1-2018 at 05:07
phlogiston, sorry, I can't find a way to share it. I have gone over it again though, and it seems fine. I'll breadboard it and see how it works then.
Harristotle - 1-1-2018 at 06:03
You remind me of a 1000 volt circuit I was making for a photomultiplier tube, a while ago.
I discovered that my breadboard was rated to under 250 volts.
It was a character, knowledge and vocabulary building experience! I only discovered the error of my ways late at night when I turned out the light
after days of replacing this, that and the other.
May I suggest that often breadboards are unsuitable for HV work.
Cheers,
H.
Radium212 - 1-1-2018 at 06:53
Ok, thanks for the tip! I have tons of components so can afford a few failed prototypes.