Found in Maxim's documentation from the 90's, this circuit uses an integrated from the time providing a 12 V output from 10 to 12 V inputs.
This circuit is from an old documentation. Integrated circuit 723 is not common today. The power...
This small receiver for the medium wave range was found in Radio Electronics magazine from July...
This astable multivibrator configuration causes two LEDs to alternately flash at a frequency...