Wednesday, November 21, 2018

AAA Battery Protection with Wrong Polarity LED Indicator

This simple circuit will protect the AA or AAA battery from the wrong polarity connection to your device. If the battery is connected in the opposite way, D1 will conduct and PTC Fuse will break the circuit. Wrong polarity indicator, LED 1 will be turned on at the same time.

Schmitt trigger for cleaning up noisy or slow-rising digital signals

  A Schmitt trigger is a circuit that converts an analog input signal into a digital output signal with hysteresis. It's characterised b...