I designed a miniature and cost effective adjustable timer that is wired in between a device and it’s DC power supply. When the timer expires, it will power cycle the device, and start again. This was a cheap device that has been used on many remote wireless internet routers, which can be prone to freezing up. This device will then turn the router off and on again to automatically re-establish the remote connection. This is quite versatile and can be used for many other applications.

Technical challenges:

• Cost effective – minimal bill of materials (BOM).
• Adjustable timer setting before power cycle.
• Indication of remaining time (output LED blinks to count remaining minutes to power cycle).
• Wide voltage range (up to 26VDC) to support a wide range of applications.
• Very low power draw. Is powered from the switched supply making installation quick and easy.
• Physical dimensions very compact (55 x 20 mm). High density surface mount technology used.

The following are some photos of the prototypes showing the populated PCB, powered-up with LED indicators.