Author Topic: So i made this, is this safe?  (Read 1291 times)

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Offline jacobdelTopic starter

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So i made this, is this safe?
« on: March 07, 2019, 02:20:36 pm »
Greetings,

So i made this device to detect a jackphone voltage. But the question is, can i trust this device 24/7 plugged in?
The battery used is a NiCd NIKKO battery. Minimum current is 0.5mA and maximum current is 100mA +-
Possible future shorts are not really my concern, but you never know.

(i did not add that fuse)
But i've never heard/seen NiCd batteries catch fire :/
I've attached 2 images

Kind regards,
Jacob
« Last Edit: March 07, 2019, 02:29:51 pm by jacobdel »
 

Online Zero999

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Re: So i made this, is this safe?
« Reply #1 on: March 07, 2019, 02:25:56 pm »
I don't know. The image isn't very clear. It appears to be have converter to a very low colour depth, 4-bit, then saved in jpeg, normally a 24-bit format.  :palm:
 

Offline jacobdelTopic starter

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Re: So i made this, is this safe?
« Reply #2 on: March 07, 2019, 02:31:06 pm »
I don't know. The image isn't very clear. It appears to be have converter to a very low colour depth, 4-bit, then saved in jpeg, normally a 24-bit format.  :palm:

woops sorry about that, thought the limit was 100kb
 

Online Zero999

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Re: So i made this, is this safe?
« Reply #3 on: March 07, 2019, 04:15:19 pm »
The second image with the higher colour depth is has a smaller file size then the other one with the lower colour depth, which is odd.

The big thing which stands out to me as dangerous is the lack of over-current protection. There should be a fuse or PTC resistor to protect against short circuits. You were wrong that it's not a concern. Whilst the likelihood of a short circuit may be low, the impact is big, since NiCd cells have a very low impedance and high short circuit current, which can cause wires to glow red hot and set fire to nearby flammable materials.

What's the case made out of? Ideally it should be flame retardant. In other words if you expose it to a flame, it shouldn't continue to burn, once the flame has been removed.
 
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Offline daniel444

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Re: So i made this, is this safe?
« Reply #4 on: March 08, 2019, 06:53:28 am »
just house it in an old ceramic pot
 
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