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.
This circuit allows you to modify the resolution of a measurement bridge. It was found in the...
The four gates of a 40111 IC are used in thes two-out circuit. The output chages their state in a...
This circuit measures the strength of audio signals. We found it in an American publication from...