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Re-purposing ideas for smoke detectors circuitry ?

Externet

Well-Known Member
Hi.
They are supposed to have very high gain amplifiers; can heart beating, respiration be monitored somehow using a canibalized one ?
What about a hyper sensitive microphone for listening to termites chewing:rolleyes:, checking purity of water for particles/microorganisms in suspension, geolistening, ...
What do you know about them and applicable uses ?
Someone wanted to make a geiger counter... would it work ?
 

Nigel Goodwin

Super Moderator
Most Helpful Member
Just opamps, use an opamp or two - nothing special about them. Historically there were a number of projects in magazines for making your own, as far as I'm aware you can still buy the individual sensors.

There's a simple one here:

 

ronsimpson

Well-Known Member
Most Helpful Member
Re-purposing ideas for smoke detectors

1627239510891.png

I have never copied a .GIF before. Maybe it will work.
----edited-----
Thought it might work but no. Target practice.
 

unclejed613

Well-Known Member
Most Helpful Member
as far as I'm aware you can still buy the individual sensors.
as long as you don't buy too many of them... https://en.wikipedia.org/wiki/David_Hahn apparently he used the americium from a lot of smoke detectors to make a neutron source, with the goal of making a working "backyard" breeder reactor... just a neutron source alone can be a safety hazard.
 

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