Comprising a microprocessor, an LCD, a 32.768-kHz crystal, and little else, the basic countdown-timer circuit in Figure 1 operates from a commonly available CR2032 lithium-coin-cell battery. Based on ...
The project will be used in PCB exposure unit for the purpose of providing a countdown timer from 1 second to 99 minutes and 59 seconds. The lighting for the Ultra Violet exposure is being controlled ...
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