The circuit shown is from a 1994 National Semiconductor documentation and can be implemented with more modern operational amplifiers. The power supply must be symmetrical.
This small inverter came out in an Argentine magazine from the 1970s. It can also be assembled with...
November 2016 - NXP ARM Cortex microcontrollers for serial interfacing applications, NXP 32-bit...
This circuit can be used to generate percussion sounds such as bell, triangle, etc. The circuit...