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 ultra-low power circuit uses a diac to flash an LED when connected to the power grid. The...
We found this small FM transmitter in a 1980 publication. What sets it apart from traditional...
This linear modulator was found in old documentation. The integrated circuit used is uncommon...