This circuit of the 80s makes use of an operational one of the time. It can be designed with modern operationals and must use a symmetrical power supply.
This circuit uses a PLL4046 oscillator to excite a piezoelectric ceramic. The circuit is from an...
This circuit already explored in several diagrams in this section was found in a 90’s Popular...
This logic probe or logic level indicator is suitable for use in CMOS circuits. The power comes...