Quasar ElectronicsAS3152KT - 12Vdc Instant On or Delayed-On Timer Relay Boardhttp://www.quasarelectronics.co.uk/media/ecom/prodsm/3152_small.jpg6 second to 20 minute 12Vdc timer board. Relay output. Instant-on, Delayed Off or Delayed-on and Hold modes. Click Product Title for full details.Electronics > Circuit Components > Printed Circuit Boards > Development Boardsquasar-diy-k1523152KT12.95Quasar Electronics Limitednewin stockhttp://www.quasarelectronics.co.uk/Item/3152-countdown-multi-timer-relay-board
6 second to 20 minute 12Vdc timer board with choice of either "instant-on delayed off" or "delayed-on and hold" operation with a relay output (C, NO, NC). Countdown starts when power is applied to the board. The relay changes state at the end of the user set delay period and remains in that condition until the power is removed.
An onboard jumper selects the operation mode. A small On/Off switch can be used to reset the timer.
The delay time is set using a series of onboard jumpers and a trimpot. The number of "counts" made is set using a bank of nine possible jumper positions (8, 16, 32, 64, 128, .... to 8192). A trimpot allows you to set the time period for each "count".
Timing range as supplied is from about 6 seconds to a maximum of two hours. Up to 22.7 hours is possible using different components for the RC network (not provided).