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
• LED status indicator

Technical Specifications
Supply	Regulated 12Vdc (Order Code PSU445  with connector 778.106)
Current consumption	Light Activated: <1.5mA standby, <46mA relay active Dark Activated: <2mA standby, <45mA relay active
Output	1 x SPDT Relay
Relay Rating	250Vac/5A max (see Relay Datasheet for details)
Relay Connections	C, NO, NC
Board Dimensions	37x60mm
Board Connections	Screw terminal blocks
Product Format	Electronic Kit (KT ) or Assembled (AS) more