The first version of this style of timer light used an inductor to boost the voltage and drive traditional 24V strings of LEDs, but the noisy switching often caused stability problems with the processor and also tended to be quite inefficient meaning that the batteries didn’t last very long. This version uses a traditional parallel array of LEDs with alternating polarity for flashing effects. The nice thing is the super-simple circuitry consisting of a chip which appears to have the H-bridge driver integrated into it, That means it’s basically a single chip with a crystal, suitable load capacitors, a supply decoupling capacitor and a button.
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