Found in an Electronic Design from the 90's, this circuit supplies voltages according to the indicated component values. The integrated circuit is from the time.
This circuit is from 1992 documentation, but it can still be assembled today, as the components used are...
We found this circuit in a 1983 English magazine, but it can be easily assembled with the BC548...
This is a circuit for receiving signals from the previous transmitter. The circuit uses a common...