Digital Timers Counters and Clocks

	Six digit preset counter 4518 - pdf Six digit preset counter control - pdf Six Digit preset up-down counter 4029 - pdf Six Digit preset up-down control - pdf Six Digit preset up-down block - pdf Sequential Timer CD40xx - pdf Sequential Timer/counter 7217, pdf CD4060 CD4020 long duration timer. Timer Clock Preset Thumbwheel  Switch 1 Hz - 1 pps clock CD4060 32768 Hz Crystal
Timers and Counters : Timers and Counters along with Analog Process Controllers formed the front end of Industrial Automation.  Even today automation systems and control panels use analog timers and electromechanical counters. These are Indispensable. Analog + Digital combination controllers came next which were little bigger and offered better stability. They had thumbwheel switches as user interface in place of potentiometers. uP based Systems with chips like 8085 came after that, they consumed more power and were big in size. The coming of Cmos uC like 80C31 made Process Instrumentation Small and SMD made even 48 X 48 DIN sizes possible. Now Analog and uC based designs are used in different applications. Digital Hybrids and uP instruments are not used as they were Transient-Technology Methods.     Here are the source files for a timer project show above.  20017.zip, -  20029.zip, -  20030.zip. Anantha Narayan
	Digital Comparator 74HC85 - dpcnt- pdf ICL7135 Analog Section - dpcnt- pdf Ram 7217 Control Section - dpcnt - pdf Output Relays Key Inputs - dpcnt - pdf Mem Logic and Clock -dpcnt - pdf Digital Timer part 1 - Logic Clock- pdf Digital Timer part 2 - 7217 display - pdf Quad Presettable Timers - pdf

Some Pages Require Adobe Acrobat Reader with Web Browser Integration Enabled.