Found in Fairchild documentation from the 90s, this circuit generates signals with the characteristics given next to the diagram. The power supply must be symmetrical.
This circuit was found in a 1980s documentation. Q1 and Q2 can be BC548 and SCR a TIC106. The...
Found in Popular Electronics this circuit uses common components to control an incandescent lamp with...
It can be obtained from Mouser Electronics new transceiver modules long range (LORA) Microchip...