This detector with ultra-low deviation was found in an American documentation from the 90s. Operational amplifiers are from that time. The power supply must be symmetrical.
This circuit was found in the June 1986 issue of Radio Electronics magazine. It is based on two...
The configuration shown in the figure uses two NPN transistors activating the load when the input...
With this configuration, greater power can be obtained from an operational amplifier, thanks to...