A simple to operate and useful countdown timer with digital display and relay output. The circuit is PIC based to ensure accuracy and reliability. It is ideal for use in automatic machines and in programmable time counting in general.
Simple 3 button operation (START / COUNT / RESET). Choice of counting down in 1 Second or 0.1 Second increments. Countdown time can be set up to either 99 Minutes 59 Seconds or 999.9 Seconds.
Relay actives when countdown commences and turns off again when zero is reached. On reaching zero the display returns to the previously programmed time for repeat operation or reprogramming as required.
Countdown can be paused and resumed as required. Relay turns off when timer is paused.
Relay has both NO and NC contacts. Time scale is easily set using an onboard jumper. A battery backup connection point is provided so time setting is retained in event of power loss.
The unit consists of two PCBs, one for the control unit and the other for the display panel. Kit version includes solder for assembly.Specifications
|Input Voltage||12-15Vdc (e.g. Order Code 660.446UK with connector 777.001UK)|
|Current Consumption||<100mA relay off (<125mA relay active)|
|Battery Backup||9V @ <10mA i.e. PP3 battery (Order Code 656.020UK)|
|Time Scales||1: 0 - 999.9 Seconds (0.1 second resolution)|
2: 0 - 99 Minute 59 Seconds (1 second resolution)
|Output Type||1 x SPDT Relay|
|Output Load||230Vac @ 1A, 110Vac @ 2A, 30Vdc @ 2A maximum|
|Output Connections||NO, NC, C (Relay FAQ)|
|Overall Dimensions (mm)||~ 93W x 42H x 79D (excluding buttons)|
|Board Dimensions (mm)||1 @ 40x93mm (display), 1 @ 80x93mm (control)|
|Board Connections||Solder Posts (hole spacing will accept screw terminal blocks)|
|Product Formats||SELF-ASSEMBLY Electronic Kit (KT) or|
PRE-ASSEMBLED Electronic Module (AS) Product Formats Info
|Documentation||1173 User Manual|