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COUNTDOWN TIMER W/ RELAY OUTPUT

(Kit - Soldering Required)

timer circuit
click image to enlarge
diy k152

Countdown Timer w/Relay Output

Countdown Timer kits are an ever popular item with the hobbyist. One of the main methods used is the ever-popular 555 timer IC. In this countdown timer circuit we use a 555, a counter IC and a transistor switch to activate a relay either on-to-off or off-to-on (mode selected by a jumper) as soon as the counting period is over. The circuit consists of 3 parts: an oscillator, a ripple counter and two switching transistors. 

Specifications:

  • L: 2" W: 2-1/4" H: 5/8"
  • Requires external 12 volt dc power supply
    (Need a Power Supply?)
  • Jumper Selectable count down times ( 8 to 8192 seconds)
  • Relay has Normally Open and Normally Closed Contacts rated for voltages 28VDC @ 10A, 125VAC @ 10A, or 240VAC @ 7A. (more info on how relays work)

See CK1611.pdf for complete details, including schematic and theory of operation.  Requires Adobe Acrobat Reader available at www.adobe.com for FREE!

Note: This is a kit, you will receive parts to build the item pictured. CK1611 - Countdown Timer w/Relay Output - $19.95

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