This is an interesting configuration of the LM317 voltage regulator found in an EDN from the 90s. The circuit uses an optical coupler and is intended to supply constant current to a sensor resistor.
This sensitive sound or noise activated key can be used in an alarm system. The circuit is from an...
August 2016 - Mouser Electronics is offering the development kit board Joule ™ 570x with expansion from...
With this relaxation oscillator with a neon lamp we can generate small intensity audio signals for...