Watchdog Timer (WDT) Supervisory Circuits and Battery Monitor Chips are designed to automatically detect system anomalies and reset the processor when irregularities occur. These devices can monitor ...

However, [Chris] demonstrates the circuit with just four. Flasher circuits were in regular use well into the 1990s. The original Mazda Miata has a very similar circuit tucked up under the ...

I could have done it with a 555. More often ... two 555s are set up as basic flasher circuits, each feeding a vactrol – essentially a resistive optoisolater. Inside is an LED, which is ...