Quasar ElectronicsAS3079BKT - Light / Dark Activated Switch With Hysterisishttp://www.quasarelectronics.co.uk/media/ecom/prodsm/3079b_small.jpgThis kit uses the LDR and built-in hysterisis of the LM741 op-amp IC circuitry to allow the switch to operate with small and gradual light changes without the problem of relay chatter at the trigger threshold. Click Product Title for full details.Electronics > Circuit Components > Printed Circuit Boards > Development Boardsquasar-diy-k79b3079BKT9.95Quasar Electronics Limitednewin stockhttp://www.quasarelectronics.co.uk/Item/3079b-light-dark-activated-switch-with-hysteresis
This board uses an LDR and built-in hysterisis of the LM741 op-amp IC circuitry to eliminate the problem of relay chatter at the trigger threshold. This allows the switch to operate effectively where there is a gradual light change (i.e. dawn and dusk).
The Light/Dark mode switch is used to select either light or dark activation of the relay. This enables the unit to be operated in its low-current standby mode for the majority of the time according to your application.
Adjustable turn-on sensitivity
Switch to select either 'light' or 'dark' activation