Homebrew PCBs

Hello all,

I am wanting to build a seeking device (camera), or thermal heat 
detector. No need for LCD, a blinking LED would be fine. I want to 
use it to track game for hunters who can not recover wounded game 
(mostly deer)that has been shot and difficult to find.

I have seen units for this in major sporting goods magazines and 
websites. I think they are called game trackers.

Does anyone have, or know of, a schematic or layout for this or 
similar device?

Many thanks in advance,
OpryStar

oprystar wrote:
> Hello all,
> 
> I am wanting to build a seeking device (camera), or thermal heat 
> detector. No need for LCD, a blinking LED would be fine. I want to 
> use it to track game for hunters who can not recover wounded game 
> (mostly deer)that has been shot and difficult to find.
> 
> I have seen units for this in major sporting goods magazines and 
> websites. I think they are called game trackers.
> 
> Does anyone have, or know of, a schematic or layout for this or 
> similar device?

Just need a lens that focuses onto an IR photodiode. The lens needs
to be transparent and a low noise preamp connects to the photodiode.
AC couple the DC output of the preamp to an audio circuit. For
more sensitivity, use an optical chopper and synchronous demodulators.

Russell,  Many thanks for your follow up! I am not sure what some of 
that is. I will start researching it right away though. You made it 
sound like a pretty simple layout.

Thanks, OpryStar




--- In Homebrew_PCBs@y..., "oprystar" <oprystar@y...> wrote:

> Hello all,
> 
> I am wanting to build a seeking device (camera), or thermal heat 
> detector. No need for LCD, a blinking LED would be fine. I want to 
> use it to track game for hunters who can not recover wounded game 
> (mostly deer)that has been shot and difficult to find.
> 
> I have seen units for this in major sporting goods magazines and 
> websites. I think they are called game trackers.
> 
> Does anyone have, or know of, a schematic or layout for this or 
> similar device?
> 
> Many thanks in advance,
> OpryStar