This circuit is from 1980s documentation. The maximum operating frequency is 3.5 MHz. The current of the LED can be from 0 to 100 mA. The integrated circuits used are from that time.
We found this circuit in an Electronic Engineering of the 90s. The circuit can be implemented with any...
I found this circuit in an article in a 2003 publication. The circuit is an example of how to...
We found this circuit in a 1975 publication. The power supply must be symmetrical, but other...