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PostPosted: Mon Dec 07, 2015 4:42 pm 

Joined: Tue Apr 08, 2014 3:15 pm
Posts: 5
Are these silver contacts? (First two pics, fire alarm)

Are these ic chips? they are less than 6-legged, so i wasnt sure. (last four pics, circuit boards)

can take better pictures if necessary
thank you for any input/help!


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PostPosted: Mon Dec 07, 2015 5:58 pm 

Joined: Tue Feb 03, 2015 6:57 pm
Posts: 3025
Location: Low DOS
Smoke alarm. Yes they're silver plated brass.
Now that you know put it back together and bring it to a fire department or hazmat centre. They have radioactive glow like a lightbulb material in them.
1) no one will willingly buy the board. (Atleast not from a consumer)
2) taking them apart breaks laws in most states.
3) selling them without declaring them (hey smoke detector boards) is a federal offence. Punishable by up to 20 years in prison!


No. Those little 4-leg squares are solid state capacitors, gate fuses, or current resistors; depending on the codes. Most would go cbm rate at a large scrap yard. Boardsort doesn't buy them.


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PostPosted: Tue Dec 15, 2015 1:22 am 

Joined: Thu Aug 06, 2015 7:34 pm
Posts: 91
Wow that's crazy I would've never thought that. That appears to be a pretty standard low grade board. Are there other common items with rules/dangers like that that I wouldn't expect? Off the top of your head?


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PostPosted: Tue Dec 15, 2015 2:48 am 

Joined: Tue Feb 03, 2015 6:57 pm
Posts: 3025
Location: Low DOS
Smoke detectors
Carbon monoxide detectors
(Insert gas here) detectors
All have a radioactive unit
All have heavy regulations and fines/imprisonment rules.

SOME digital thermostats and old Hospital digital thermometers have mercury. But the ones that do are marked.

Pre-1992 equipment sometimes has mercury batteries.

Old organs have mercury sensors for temperature control. as do any server/mainframe temperature units.

Tube tvs are regulated due to phosphorus.
The "problem" of leaded glass is a myth long disproved abd the glass itself is as far as I'm aware only monitored in 1 or 2 states. Cal and possibly ohio.

Many older computer boards, especially pre1988 and kit computers, have boron components, regulated by the fda and epa as to disposal. Ti-80 and ti-90/99 come to mind. And old tandy equipment. The commodore vic line.


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PostPosted: Tue Dec 15, 2015 3:03 am 

Joined: Tue Feb 03, 2015 6:57 pm
Posts: 3025
Location: Low DOS
americium-241 in smoke detectors

Mercury and boron are obvious.

I'll see if i can track down warnings and regulations for the other detectors


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