This circuit was obtained in a Hands-On Electronics from the 90's. The circuit turns on one LED at the end of the timer, erasing the other. The timing can be increased by changing C1.
This circuit is from 2001 documentation and consists of a small FM transmitter with two inputs, one...
This small source for low consumption projects was found in an old national documentation. The...
We found this receiver for medium and short waves in a publication from the 1980s. The medium wave...