Timer Schematic

Archilochus

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Hi all,
Just uploaded the schematic diagram for the (modified) timer circuit I've been using.

http://www.geocities.com/archilochus57

It's at the bottom of the page.  It's not your basic 555 type timer.  It's more complex but offers advantages over the 555's:  Temperature stability of time durations, easily selectable time delays between photos, and low power consumption.  These three circuits (sensor, day/night, and timer) together  consume only ~ 210 microAmps (0.21 mA) compared to between 120 to 350 microAmps for each 555 (depending on supply voltage and external component choices) and 125 micro amps for the RS 49-425 sensor.

Good Luck!,
Archilochus
 

Tinhorn

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WOW Archilochus

Talk about a Deluxe Home Brew Unit ! ! ! ! !

What kind of a PC board do you use for complicated circuits like these?

I thought about using the "Half Press" feature for the Walk Test light but never tried it....

Good Job and Thanx for the drawings

Tinhorn
 

Archilochus

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Hi Tinhorn,
I've been using the free demo of Winboard to draw PC boards.  It's the companion program to Windraft.  < http://www.ivex.com  >.  The program has a 100 pin limit, but there are a few tricks for working around this limitation.

I've started using surface mount parts whenever possible when building PC boards - saves a ton of time drilling holes for IC pins and makes boards considerably smaller.

Etching home-brew surface mount PC boards is a skill I'm slowly getting better at.  Those small traces tend to disappear if you etch too long or at too high a temp.

Just have to figure out how to build a home-made camera and housing and then I can really call the cams "home-made"!  Didn't I see a post where someone mentioned making their own box out of fiberglass?  Wonder how it went for them?

Archilochus
 

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