Found in a 1970 documentation, this circuit makes use of 741 operational amplifiers that are common today. Note that the power supply must be symmetrical.
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...