This circuit is from a 1992 publication and is based on CMOS technology. The circuit is powered by a 6 V source and the displays are of common cathode.
Found in a 1967 American electronics magazine, this circuit has an input impedance of 2000 ohms....
This circuit makes use of components from the time it was published. The TCA151 is not a common...
This ultrasonic insect repellent was found in American documentation from the 1980s. The...