I lead a group build of a 3-stage timer last year at the Rocky Mountain Haunters group and finally got around to updating the build docs. This timer has three stages, a Delay, a Run, and an Off. The Delay is the amount of time (1-60 seconds) from when the timer is triggered before the prop turns on. The On stage is the amount of time (1-60 seconds) that the prop runs. And the Off stage is the amount of time (1-60 seconds) the the prop is off (before the timer can be re-triggered). It can be controlled via a test button on the timer or a remote contact/trigger/mat switch, etc. The circuit board is based on the little Radio Shack prototyping boards (see the Bill of Materials in the Document) for ease of building and reproducibility.
For anyone that is intersted, they can be found here:
Build Doc
Circuit Board Layout
Enjoy!
For anyone that is intersted, they can be found here:
Build Doc
Circuit Board Layout
Enjoy!