The integrated circuit used in this application is not currently common. The circuit is from 80s documentation. The power depends on the controlled load.
This circuit was found in 1967 Philips documentation. It uses transistors from that time....
In current sensors such as the INA185 from Texas Instruments, protection against input transients can be...
This circuit converts sinusoidal signals to square. The upper limit of frequency is abour 100 kHz...