We found this circuit in a 1967 documentation. The integrated circuit and an operational one of the time. Modern equivalents can be tried out. The power supply is symmetrical.
This 2005 circuit was found in an English publication and can be implemented with virtually any...
This circuit was found in the February 1990 issue of Radio Electronics magazine. The gain is given...
August 2017 - Microchip's new ATtiny1617 8-bit AVR microcontrollers running at 20 MHz and 16 kB...